PIOGLITAZONE by Solco Healthcare LLC PIOGLITAZONE tablet

PIOGLITAZONE by

Drug Labeling and Warnings

PIOGLITAZONE by is a Prescription medication manufactured, distributed, or labeled by Solco Healthcare LLC. Drug facts, warnings, and ingredients follow.

Drug Details [pdf]

  • BOXED WARNING (What is this?)

    WARNING: CONGESTIVE HEART FAILURE

    • Thiazolidinediones, including pioglitazone tablets, cause or exacerbate congestive heart failure in some patients [see Warnings and Precautions (5.1)].
    • After initiation of pioglitazone tablets, and after dose increases, monitor patients carefully for signs and symptoms of heart failure (e.g., excessive, rapid weight gain, dyspnea, and/or edema). If heart failure develops, it should be managed according to current standards of care and discontinuation or dose reduction of pioglitazone tablets must be considered.
    • Pioglitazone tablets are not recommended in patients with symptomatic heart failure.
    • Initiation of pioglitazone tablets in patients with established New York Heart Association (NYHA) Class III or IV heart failure is contraindicated [see Contraindications (4) and Warnings and Precautions (5.1)].
  • 1  INDICATIONS AND USAGE

    Monotherapy and Combination Therapy

    Pioglitazone tablets are indicated as adjuncts to diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus in multiple clinical settings [see Clinical Studies (14)].

    Important Limitations of Use

    Pioglitazone tablets exert their antihyperglycemic effects only in the presence of endogenous insulin. Pioglitazone tablets should not be used to treat type 1 diabetes or diabetic ketoacidosis, as it would not be effective in these settings.

    Use caution in patients with liver disease [see Warnings and Precautions (5.3)].

  • 2  DOSAGE AND ADMINISTRATION

    2.1 Recommendations for All Patients

    Pioglitazone tablets should be taken once daily and can be taken without regard to meals.

    The recommended starting dose for patients without congestive heart failure is 15 mg or 30 mg once daily.

    The recommended starting dose for patients with congestive heart failure (NYHA Class I or II) is 15 mg once daily.

    The dose can be titrated in increments of 15 mg up to a maximum of 45 mg once daily based on glycemic response as determined by HbA1c.

    After initiation of pioglitazone tablets or with dose increase, monitor patients carefully for adverse reactions related to fluid retention such as weight gain, edema, and signs and symptoms of congestive heart failure [see Boxed Warning and Warnings and Precautions (5.5)].

    Liver tests (serum alanine and aspartate aminotransferases, alkaline phosphatase, and total bilirubin) should be obtained prior to initiating pioglitazone tablets. Routine periodic monitoring of liver tests during treatment with pioglitazone tablets is not recommended in patients without liver disease. Patients who have liver test abnormalities prior to initiation of pioglitazone tablets or who are found to have abnormal liver tests while taking pioglitazone tablets should be managed as described under Warnings and Precautions [see Warnings and Precautions (5.3) and Clinical Pharmacology (12.3)].

    2.2 Concomitant Use with an Insulin Secretagogue or Insulin

    If hypoglycemia occurs in a patient co-administered pioglitazone tablets and an insulin secretagogue (e.g., sulfonylurea), the dose of the insulin secretagogue should be reduced.

    If hypoglycemia occurs in a patient co-administered pioglitazone tablets and insulin, the dose of insulin should be decreased by 10% to 25%. Further adjustments to the insulin dose should be individualized based on glycemic response.

    2.3 Concomitant Use with Strong CYP2C8 Inhibitors

    Coadministration of pioglitazone tablets and gemfibrozil, a strong CYP2C8 inhibitor, increases pioglitazone exposure approximately 3-fold. Therefore, the maximum recommended dose of pioglitazone tablets is 15 mg daily when used in combination with gemfibrozil or other strong CYP2C8 inhibitors [see Drug Interactions (7.1) and Clinical Pharmacology (12.3)].

  • 3  DOSAGE FORMS AND STRENGTHS

    Round tablet contains pioglitazone as follows:

    • 15 mg: White to off-white, debossed with “295” on one side and “S” on the other
    • 30 mg: White to off-white, debossed with “293” on one side and “S” on the other
    • 45 mg: White to off-white, debossed with “294” on one side and “S” on the other
  • 4  CONTRAINDICATIONS

    • Initiation in patients with established NYHA Class III or IV heart failure [see Boxed Warning].
    • Use in patients with known hypersensitivity to pioglitazone or any other component of pioglitazone tablets.
  • 5  WARNINGS AND PRECAUTIONS

    5.1 Congestive Heart Failure

    Pioglitazone tablets, like other thiazolidinediones, can cause dose-related fluid retention when used alone or in combination with other antidiabetic medications and is most common when pioglitazone tablets are used in combination with insulin. Fluid retention may lead to or exacerbate congestive heart failure. Patients should be observed for signs and symptoms of congestive heart failure. If congestive heart failure develops, it should be managed according to current standards of care and discontinuation or dose reduction of pioglitazone tablets must be considered [see Boxed Warning, Contraindications (4), and Adverse Reactions (6.1)].

    5.2 Hypoglycemia

    Patients receiving pioglitazone tablets in combination with insulin or other antidiabetic medications (particularly insulin secretagogues such as sulfonylureas) may be at risk for hypoglycemia. A reduction in the dose of the concomitant antidiabetic medication may be necessary to reduce the risk of hypoglycemia [see Dosage and Administration (2.2)].

    5.3 Hepatic Effects

    There have been postmarketing reports of fatal and non-fatal hepatic failure in patients taking pioglitazone tablets, although the reports contain insufficient information necessary to establish the probable cause. There has been no evidence of drug-induced hepatotoxicity in the pioglitazone tablets controlled clinical trial database to date [see Adverse Reactions (6.1)].

    Patients with type 2 diabetes may have fatty liver disease or cardiac disease with episodic congestive heart failure, both of which may cause liver test abnormalities, and they may also have other forms of liver disease, many of which can be treated or managed. Therefore, obtaining a liver test panel (serum alanine aminotransferase [ALT], aspartate aminotransferase [AST], alkaline phosphatase, and total bilirubin) and assessing the patient is recommended before initiating pioglitazone tablets therapy. In patients with abnormal liver tests, pioglitazone tablets should be initiated with caution.

    Measure liver tests promptly in patients who report symptoms that may indicate liver injury, including fatigue, anorexia, right upper abdominal discomfort, dark urine or jaundice. In this clinical context, if the patient is found to have abnormal liver tests (ALT greater than 3 times the upper limit of the reference range), pioglitazone tablets treatment should be interrupted and investigation done to establish the probable cause. Pioglitazone tablets should not be restarted in these patients without another explanation for the liver test abnormalities.

    Patients who have serum ALT greater than three times the reference range with serum total bilirubin greater than two times the reference range without alternative etiologies are at risk for severe drug-induced liver injury, and should not be restarted on pioglitazone tablets. For patients with lesser elevations of serum ALT or bilirubin and with an alternate probable cause, treatment with pioglitazone tablets can be used with caution.

    5.4 Urinary Bladder Tumors

    Tumors were observed in the urinary bladder of male rats in the two-year carcinogenicity study [see Nonclinical Toxicology (13.1)]. In addition, during the three year PROactive clinical trial, 14 patients out of 2605 (0.54%) randomized to pioglitazone tablets and 5 out of 2633 (0.19%) randomized to placebo were diagnosed with bladder cancer. After excluding patients in whom exposure to study drug was less than one year at the time of diagnosis of bladder cancer, there were 6 (0.23%) cases on pioglitazone tablets and two (0.08%) cases on placebo. After completion of the trial, a large subset of patients was observed for up to 10 additional years, with little additional exposure to pioglitazone tablets. During the 13 years of both PROactive and observational follow-up, the occurrence of bladder cancer did not differ between patients randomized to pioglitazone tablets or placebo (HR =1.00; [95% CI: 0.59−1.72]).

    Findings regarding the risk of bladder cancer in patients exposed to pioglitazone tablets vary among observational studies; some did not find an increased risk of bladder cancer associated with pioglitazone tablets, while others did.

    A large prospective10-year observational cohort study conducted in the United States found no statistically significant increase in the risk of bladder cancer in diabetic patients ever exposed to pioglitazone tablets, compared to those never exposed to pioglitazone tablets (HR =1.06 [95% CI 0.89−1.26]).

    A retrospective cohort study conducted with data from the United Kingdom found a statistically significant association between ever exposure to pioglitazone tablets and bladder cancer (HR: 1.63; [95% CI: 1.22−2.19]).

    Associations between cumulative dose or cumulative duration of exposure to pioglitazone tablets and bladder cancer were not detected in some studies including the 10-year observational study in the U.S., but were in others. Inconsistent findings and limitations inherent in these and other studies preclude conclusive interpretations of the observational data.

    Pioglitazone tablets may be associated with an increase in the risk of urinary bladder tumors. There are insufficient data to determine whether pioglitazone is a tumor promoter for urinary bladder tumors.

    Consequently, pioglitazone tablets should not be used in patients with active bladder cancer and the benefits of glycemic control versus unknown risks for cancer recurrence with pioglitazone tablets should be considered in patients with a prior history of bladder cancer.

    5.5 Edema

    In controlled clinical trials, edema was reported more frequently in patients treated with pioglitazone tablets than in placebo-treated patients and is dose-related [see Adverse Reactions (6.1)]. In postmarketing experience, reports of new onset or worsening edema have been received.

    Pioglitazone tablets should be used with caution in patients with edema. Because thiazolidinediones, including pioglitazone tablets, can cause fluid retention, which can exacerbate or lead to congestive heart failure, pioglitazone tablets should be used with caution in patients at risk for congestive heart failure. Patients treated with pioglitazone tablets should be monitored for signs and symptoms of congestive heart failure [see Boxed Warning, Warnings and Precautions (5.1) and Patient Counseling Information (17)].

    5.6 Fractures

    In PROactive (the Prospective Pioglitazone Clinical Trial in Macrovascular Events), 5238 patients with type 2 diabetes and a history of macrovascular disease were randomized to pioglitazone tablets (N=2605), force-titrated up to 45 mg daily or placebo (N=2633) in addition to standard of care. During a mean follow-up of 34.5 months, the incidence of bone fracture in females was 5.1% (44/870) for pioglitazone tablets versus 2.5% (23/905) for placebo. This difference was noted after the first year of treatment and persisted during the course of the study. The majority of fractures observed in female patients were nonvertebral fractures including lower limb and distal upper limb. No increase in the incidence of fracture was observed in men treated with pioglitazone tablets (1.7%) versus placebo (2.1%). The risk of fracture should be considered in the care of patients, especially female patients, treated with pioglitazone tablets and attention should be given to assessing and maintaining bone health according to current standards of care.

    5.7 Macular Edema

    Macular edema has been reported in postmarketing experience in diabetic patients who were taking pioglitazone tablets or another thiazolidinedione. Some patients presented with blurred vision or decreased visual acuity, but others were diagnosed on routine ophthalmologic examination.

    Most patients had peripheral edema at the time macular edema was diagnosed. Some patients had improvement in their macular edema after discontinuation of the thiazolidinedione.

    Patients with diabetes should have regular eye exams by an ophthalmologist according to current standards of care. Patients with diabetes who report any visual symptoms should be promptly referred to an ophthalmologist, regardless of the patient's underlying medications or other physical findings [see Adverse Reactions (6.1)].

    5.8 Macrovascular Outcomes

    There have been no clinical studies establishing conclusive evidence of macrovascular risk reduction with pioglitazone tablets.

  • 6  ADVERSE REACTIONS

    The following serious adverse reactions are discussed elsewhere in the labeling:

    • Congestive heart failure [see Boxed Warning and Warnings and Precautions (5.1)]
    • Edema [see Warnings and Precautions (5.5)]
    • Fractures [see Warnings and Precautions (5.6)]

    6.1 Clinical Trials Experience

    Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

    Over 8500 patients with type 2 diabetes have been treated with pioglitazone tablets in randomized, double-blind, controlled clinical trials, including 2605 patients with type 2 diabetes and macrovascular disease treated with pioglitazone tablets in the PROactive clinical trial. In these trials, over 6000 patients have been treated with pioglitazone tablets for six months or longer, over 4500 patients have been treated with pioglitazone tablets for one year or longer, and over 3000 patients have been treated with pioglitazone tablets for at least two years.

    In six pooled 16-to 26-week placebo-controlled monotherapy and 16-to 24-week add-on combination therapy trials, the incidence of withdrawals due to adverse events was 4.5% for patients treated with pioglitazone tablets and 5.8% for comparator-treated patients. The most common adverse events leading to withdrawal were related to inadequate glycemic control, although the incidence of these events was lower (1.5%) with pioglitazone tablets than with placebo (3.0%).

    In the PROactive trial, the incidence of withdrawals due to adverse events was 9.0% for patients treated with pioglitazone tablets and 7.7% for placebo-treated patients. Congestive heart failure was the most common serious adverse event leading to withdrawal occurring in 1.3% of patients treated with pioglitazone tablets and 0.6% of patients treated with placebo.

    Common Adverse Events: 16-to 26-Week Monotherapy Trials

    A summary of the incidence and type of common adverse events reported in three pooled 16-to 26-week placebo-controlled monotherapy trials of pioglitazone tablets is provided in Table 1. Terms that are reported represent those that occurred at an incidence of >5% and more commonly in patients treated with pioglitazone tablets than in patients who received placebo. None of these adverse events were related to pioglitazone tablets dose.

    Table 1. Three Pooled 16- to 26-Week Placebo-Controlled Clinical Trials of Pioglitazone Tablets Monotherapy: Adverse Events Reported at an Incidence >5% and More Commonly in Patients Treated with Pioglitazone Tablets than in Patients Treated with Placebo
    % of Patients
    PlaceboPioglitazone Tablets
    N=259 N=606

    Upper Respiratory Tract Infection

    8.5

    13.2

    Headache

    6.9

    9.1

    Sinusitis

    4.6

    6.3

    Myalgia

    2.7

    5.4

    Pharyngitis

    0.8

    5.1

    Common Adverse Events: 16-to 24-Week Add-on Combination Therapy Trials

    A summary of the overall incidence and types of common adverse events reported in trials of pioglitazone tablets add-on to sulfonylurea is provided in Table 2. Terms that are reported represent those that occurred at an incidence of >5% and more commonly with the highest tested dose of pioglitazone tablets.

    Table 2. 16- to 24-Week Clinical Trials of Pioglitazone Tablets Add-on to Sulfonylurea
    16-Week Placebo-Controlled Trial
    Adverse Events Reported in >5% of Patients and More Commonly in Patients Treated with Pioglitazone Tablets 30 mg + Sulfonylurea than in Patients Treated with Placebo + Sulfonylurea
    % of Patients
    Placebo Pioglitazone Tablets 15 mgPioglitazone Tablets 30 mg
    + Sulfonylurea+ Sulfonylurea+ Sulfonylurea
    N=187 N=184 N=189
    Note: The preferred terms of edema peripheral, generalized edema, pitting edema and fluid retention were combined to form the aggregate term of “edema.”

    Edema

    2.1

    1.6

    12.7

    Headache

    3.7

    4.3

    5.3

    Flatulence

    0.5

    2.7

    6.3

    Weight Increased

    0

    2.7

    5.3

    24-Week Non-Controlled Double-Blind Trial

    Adverse Events Reported in >5% of Patients and More Commonly in Patients Treated with Pioglitazone Tablets 45 mg + Sulfonylurea than in Patients Treated with Pioglitazone Tablets 30 mg + Sulfonylurea

    % of Patients

    Pioglitazone Tablets 30 mg

    Pioglitazone Tablets 45 mg

    + Sulfonylurea

    + Sulfonylurea

    N=351

    N=351

    Hypoglycemia

    13.4

    15.7

    Edema

    10.5

    23.1

    Upper Respiratory Tract Infection

    12.3

    14.8

    Weight Increased

    9.1

    13.4

    Urinary Tract Infection

    5.7

    6.8

    A summary of the overall incidence and types of common adverse events reported in trials of pioglitazone tablets add-on to metformin is provided in Table 3. Terms that are reported represent those that occurred at an incidence of >5% and more commonly with the highest tested dose of pioglitazone tablets.

    Table 3. 16- to 24-Week Clinical Trials of Pioglitazone Tablets Add-on to Metformin
    16-Week Placebo-Controlled Trial
    Adverse Events Reported in >5% of Patients and More Commonly in Patients Treated with Pioglitazone Tablets + Metformin than in Patients Treated with Placebo + Metformin
    % of Patients
    Placebo Pioglitazone Tablets 30 mg
    + Metformin + Metformin
    N=160 N=168
    Note: The preferred terms of edema peripheral, generalized edema, pitting edema and fluid retention were combined to form the aggregate term of “edema.” 

    Edema

    2.5

    6.0

    Headache

    1.9

    6.0

    24-Week Non-Controlled Double-Blind Trial

    Adverse Events Reported in >5% of Patients and More Commonly in Patients Treated with Pioglitazone Tablets 45 mg + Metformin than in Patients Treated with Pioglitazone Tablets 30 mg + Metformin

    % of Patients

    Pioglitazone Tablets 30 mg

    Pioglitazone Tablets 45 mg

    + Metformin

    + Metformin

    N=411

    N=416

    Upper Respiratory Tract Infection

    12.4

    13.5

    Edema

    5.8

    13.9

    Headache

    5.4

    5.8

    Weight Increased

    2.9

    6.7

    Table 4 summarizes the incidence and types of common adverse events reported in trials of pioglitazone tablets add-on to insulin. Terms that are reported represent those that occurred at an incidence of >5% and more commonly with the highest tested dose of pioglitazone tablets.

    Table 4. 16- to 24-Week Clinical Trials of Pioglitazone Tablets Add-on to Insulin
    16-Week Placebo-Controlled Trial
    Adverse Events Reported in > 5% of Patients and More Commonly in Patients Treated with Pioglitazone Tablets 30 mg + Insulin than in Patients Treated with Placebo + Insulin
    % of Patients
    Placebo Pioglitazone Tablets 15 mg Pioglitazone Tablets 30 mg
    + Insulin+ Insulin+ Insulin
    N=187 N=191 N=188
    Note: The preferred terms of edema peripheral, generalized edema, pitting edema and fluid retention were combined to form the aggregate term of “edema.”

    Hypoglycemia

    4.8

    7.9

    15.4

    Edema

    7.0

    12.6

    17.6

    Upper Respiratory Tract Infection

    9.6

    8.4

    14.9

    Headache

    3.2

    3.1

    6.9

    Weight Increased

    0.5

    5.2

    6.4

    Back Pain

    4.3

    2.1

    5.3

    Dizziness

    3.7

    2.6

    5.3

    Flatulence

    1.6

    3.7

    5.3

    24-Week Non-Controlled Double-Blind Trial

    Adverse Events Reported in > 5% of Patients and More Commonly in Patients Treated with Pioglitazone Tablets 45 mg + Insulin than in Patients Treated with Pioglitazone Tablets 30 mg + Insulin

    % of Patients

    Pioglitazone Tablets 30 mg

    Pioglitazone Tablets 45 mg

    + Insulin

    + Insulin

    N=345

    N=345

    Hypoglycemia

    43.5

    47.8

    Edema

    22.0

    26.1

    Weight Increased

    7.2

    13.9

    Urinary Tract Infection

    4.9

    8.7

    Diarrhea

    5.5

    5.8

    Back Pain

    3.8

    6.4

    Blood Creatine Phosphokinase Increased

    4.6

    5.5

    Sinusitis

    4.6

    5.5

    Hypertension

    4.1

    5.5

    A summary of the overall incidence and types of common adverse events reported in the PROactive trial is provided in Table 5. Terms that are reported represent those that occurred at an incidence of >5% and more commonly in patients treated with pioglitazone tablets than in patients who received placebo.

    Table 5. PROactive Trial: Incidence and Types of Adverse Events Reported in >5% of Patients Treated with Pioglitazone Tablets and More Commonly than Placebo
    % of Patients
    PlaceboPioglitazone Tablets
    N=2633 N=2605
    Mean duration of patient follow-up was 34.5 months.

    Hypoglycemia

    18.8

    27.3

    Edema

    15.3

    26.7

    Cardiac Failure

    6.1

    8.1

    Pain in Extremity

    5.7

    6.4

    Back Pain

    5.1

    5.5

    Chest Pain

    5.0

    5.1

    Congestive Heart Failure

    A summary of the incidence of adverse events related to congestive heart failure is provided in Table 6 for the 16- to 24-week add-on to sulfonylurea trials, for the 16- to 24-week add-on to insulin trials, and for the 16- to 24-week add-on to metformin trials. None of the events were fatal.

    Table 6. Treatment–Emergent Adverse Events of Congestive Heart Failure (CHF)
    Patients Treated with Pioglitazone Tablets or Placebo Added on to a Sulfonylurea

    Number (%) of Patients

    Placebo-Controlled Trial (16 weeks)

    Non-Controlled Double-Blind Trial (24 weeks)

    Placebo + Sulfonylurea N=187

    Pioglitazone Tablets 15 mg + Sulfonylurea N=184

    Pioglitazone Tablets 30 mg + Sulfonylurea N=189

    Pioglitazone Tablets 30 mg + Sulfonylurea N=351

    Pioglitazone Tablets 45 mg + Sulfonylurea N=351

    At least one congestive heart failure event

    2 (1.1%)

    0

    0

    1 (0.3%)

    6 (1.7%)

    Hospitalized

    2 (1.1%)

    0

    0

    0

    2 (0.6%)

    Patients Treated with Pioglitazone Tablets or Placebo Added on to Insulin

    Number (%) of Patients

    Placebo-Controlled Trial (16 weeks)

    Non-Controlled Double-Blind Trial (24 weeks)

    Placebo + Insulin

    Pioglitazone Tablets 15 mg + Insulin N=191

    Pioglitazone Tablets 30 mg + Insulin N=188

    Pioglitazone Tablets 30 mg + Insulin N=345

    Pioglitazone Tablets 45 mg + Insulin N=345

    N=187

    At least one congestive heart failure event

    0

    2 (1.0%)

    2 (1.1%)

    3 (0.9%)

    5 (1.4%)

    Hospitalized

    0

    2 (1.0%)

    1 (0.5%)

    1 (0.3%)

    3 (0.9%)

    Patients Treated with Pioglitazone Tablets or Placebo Added on to Metformin

    Number (%) of Patients

    Placebo-Controlled Trial (16 weeks)

    Non-Controlled Double-Blind Trial (24 weeks)

    Placebo + Metformin

    Pioglitazone Tablets 30 mg + Metformin N=168

    Pioglitazone Tablets 30 mg + Metformin N=411

    Pioglitazone Tablets 45 mg + Metformin

    N=160

    N=416

    At least one congestive heart failure event

    0

    1 (0.6%)

    0

    1 (0.2%)

    Hospitalized

    0

    1 (0.6%)

    0

    1 (0.2%)

    Patients with type 2 diabetes and NYHA class II or early class III congestive heart failure were randomized to receive 24 weeks of double-blind treatment with either pioglitazone tablets at daily doses of 30 mg to 45 mg (n=262) or glyburide at daily doses of 10 mg to 15 mg (n=256). A summary of the incidence of adverse events related to congestive heart failure reported in this study is provided in Table 7.

    Table 7. Treatment–Emergent Adverse Events of Congestive Heart Failure (CHF) in Patients with NYHA Class II or III Congestive Heart Failure Treated with Pioglitazone Tablets or Glyburide
    Number (%) of Subjects
    Pioglitazone Tablets N=262Glyburide N=256

    Death due to cardiovascular causes (adjudicated)

    5 (1.9%)

    6 (2.3%)

    Overnight hospitalization for worsening CHF (adjudicated)

    26 (9.9%)

    12 (4.7%)

    Emergency room visit for CHF (adjudicated)

    4 (1.5%)

    3 (1.2%)

    Patients experiencing CHF progression during study

    35 (13.4%)

    21 (8.2%)

    Congestive heart failure events leading to hospitalization that occurred during the PROactive trial are summarized in Table 8.

    Table 8. Treatment–Emergent Adverse Events of Congestive Heart Failure (CHF) in PROactive Trial
    Number (%) of Patients
    PlaceboPioglitazone Tablets
    N=2633 N=2605

    At least one hospitalized congestive heart failure event

    108 (4.1%)

    149 (5.7%)

    Fatal

    22 (0.8%)

    25 (1.0%)

    Hospitalized, nonfatal

    86 (3.3%)

    124 (4.7%)

    Cardiovascular Safety

    In the PROactive trial, 5238 patients with type 2 diabetes and a history of macrovascular disease were randomized to pioglitazone tablets (N=2605), force-titrated up to 45 mg daily or placebo (N=2633) in addition to standard of care. Almost all patients (95%) were receiving cardiovascular medications (beta blockers, ACE inhibitors, angiotensin II receptor blockers, calcium channel blockers, nitrates, diuretics, aspirin, statins and fibrates). At baseline, patients had a mean age of 62 years, mean duration of diabetes of 9.5 years, and mean HbA1c of 8.1%. Mean duration of follow-up was 34.5 months.

    The primary objective of this trial was to examine the effect of pioglitazone tablets on mortality and macrovascular morbidity in patients with type 2 diabetes mellitus who were at high risk for macrovascular events. The primary efficacy variable was the time to the first occurrence of any event in a cardiovascular composite endpoint that included all-cause mortality, nonfatal myocardial infarction (MI) including silent MI, stroke, acute coronary syndrome, cardiac intervention including coronary artery bypass grafting or percutaneous intervention, major leg amputation above the ankle, and bypass surgery or revascularization in the leg. A total of 514 (19.7%) patients treated with pioglitazone tablets and 572 (21.7%) placebo-treated patients experienced at least one event from the primary composite endpoint (hazard ratio 0.90; 95% Confidence Interval: 0.80, 1.02; p=0.10).

    Although there was no statistically significant difference between pioglitazone tablets and placebo for the three-year incidence of a first event within this composite, there was no increase in mortality or in total macrovascular events with pioglitazone tablets. The number of first occurrences and total individual events contributing to the primary composite endpoint is shown in Table 9.

    Table 9. PROactive: Number of First and Total Events for Each Component within the Cardiovascular Composite Endpoint
    CABG = coronary artery bypass grafting; PCI = percutaneous intervention

    Cardiovascular Events

    Placebo

    Pioglitazone Tablets

    N=2633

    N=2605

    First Events

    Total events

    First Events

    Total events

    n (%)

    n

    n (%)

    n

    Any event

    572 (21.7)

    900

    514 (19.7)

    803

         All-cause mortality

    122 (4.6)

    186

    110 (4.2)

    177

         Nonfatal myocardial   infarction (MI)

    118 (4.5)

    157

    105 (4.0)

    131

         Stroke

    96 (3.6)

    119

    76 (2.9)

    92

         Acute coronary syndrome

    63 (2.4)

    78

    42 (1.6)

    65

         Cardiac intervention (CABG/PCI)

    101 (3.8)

    240

    101 (3.9)

    195

         Major leg amputation

    15 (0.6)

    28

    9 (0.3)

    28

         Leg revascularization

    57 (2.2)

    92

    71 (2.7)

    115

    Weight Gain

    Dose-related weight gain occurs when pioglitazone tablets are used alone or in combination with other antidiabetic medications. The mechanism of weight gain is unclear but probably involves a combination of fluid retention and fat accumulation.

    Tables 10 and 11 summarize the changes in body weight with pioglitazone tablets and placebo in the 16- to 26-week randomized, double-blind monotherapy and 16- to 24-week combination add-on therapy trials and in the PROactive trial.

    Table 10. Weight Changes (kg) from Baseline During Randomized, Double-Blind Clinical Trials

    Control Group (Placebo)

    Pioglitazone Tablets 15 mg

    Pioglitazone Tablets 30 mg

    Pioglitazone Tablets 45 mg

    Median (25th/75th percentile)

    Median (25th/75th percentile)

    Median (25th/75th percentile)

    Median (25th/75th percentile)

    Monotherapy

    -1.4 (-2.7/0.0) N=256

    0.9 (-0.5/3.4) N=79

    1.0 (-0.9/3.4) N=188

    2.6 (0.2/5.4) N=79

    (16 to 26 weeks)

    Combination Therapy (16 to 24 weeks)

    Sulfonylurea

    -0.5 (-1.8/0.7) N=187

    2.0 (0.2/3.2) N=183

    3.1 (1.1/5.4) N=528

    4.1 (1.8/7.3) N=333

    Metformin

    -1.4 (-3.2/0.3) N=160

    N/A

    0.9 (-1.3/3.2) N=567

    1.8 (-0.9/5.0) N=407

    Insulin

    0.2 (-1.4/1.4) N=182

    2.3 (0.5/4.3) N=190

    3.3 (0.9/6.3) N=522

    4.1 (1.4/6.8) N=338
    Table 11. Median Change in Body Weight in Patients Treated with Pioglitazone Tablets Versus Patients Treated with Placebo During the Double-Blind Treatment Period in the PROactive Trial
    Note: Median exposure for both Pioglitazone Tablets and Placebo was 2.7 years.

    Placebo

    Pioglitazone Tablets

    Median

    Median

    (25th/75th percentile)

    (25th/75th percentile)

    Change from baseline to final visit (kg)

    -0.5 (-3.3, 2.0)

    +3.6 (0.0, 7.5)

    N=2581

    N=2560

    Edema

    Edema induced from taking pioglitazone tablets is reversible when pioglitazone tablets are discontinued. The edema usually does not require hospitalization unless there is coexisting congestive heart failure. A summary of the frequency and types of edema adverse events occurring in clinical investigations of pioglitazone tablets is provided in Table 12.

    Table 12. Adverse Events of Edema in Patients Treated with Pioglitazone Tablets
    Note: The preferred terms of edema peripheral, generalized edema, pitting edema and fluid retention were combined to form the aggregate term of “edema.”

    Number (%) of Patients

    Placebo

    Pioglitazone Tablets 15 mg

    Pioglitazone Tablets 30 mg

    Pioglitazone Tablets 45 mg

    Monotherapy (16 to 26 weeks)

    3 (1.2%)

    2 (2.5%)

    13 (4.7%)

    11 (6.5%)

    N=259

    N= 81

    N= 275

    N=169

    Combined Therapy(16 to 24 weeks)

    Sulfonylurea

    4 (2.1%)

    3 (1.6%)

    61 (11.3%)

    81 (23.1%)

    N=187

    N=184

    N=540

    N=351

    Metformin

    4 (2.5%)

    N/A

    34 (5.9%)

    58 (13.9%)

    N=160

    N=579

    N=416

    Insulin

    13 (7.0%) N=187

    24 (12.6%) N=191

    109 (20.5%) N=533

    90 (26.1%) N=345
    Table 13. Adverse Events of Edema in Patients in the PROactive Trial
    Number (%) of Patients
    Note: The preferred terms of edema peripheral, generalized edema, pitting edema and fluid retention were combined to form the aggregate term of “edema.”

    Placebo

    Pioglitazone Tablets

    N=2633

    N=2605

    419 (15.9%)

    712 (27.3%)

    Hepatic Effects

    There has been no evidence of induced hepatotoxicity with pioglitazone tablets in the pioglitazone tablets controlled clinical trial database to date. One randomized, double-blind 3-year trial comparing pioglitazone tablets to glyburide as add-on to metformin and insulin therapy was specifically designed to evaluate the incidence of serum ALT elevation to greater than three times the upper limit of the reference range, measured every eight weeks for the first 48 weeks of the trial then every 12 weeks thereafter. A total of 3/1051 (0.3%) patients treated with pioglitazone tablets and 9/1046 (0.9%) patients treated with glyburide developed ALT values greater than three times the upper limit of the reference range. None of the patients treated with pioglitazone tablets in the pioglitazone tablets controlled clinical trial database to date have had a serum ALT greater than three times the upper limit of the reference range and a corresponding total bilirubin greater than two times the upper limit of the reference range, a combination predictive of the potential for severe drug-induced liver injury.

    Hypoglycemia

    In the pioglitazone tablets clinical trials, adverse events of hypoglycemia were reported based on clinical judgment of the investigators and did not require confirmation with fingerstick glucose testing.

    In the 16-week add-on to sulfonylurea trial, the incidence of reported hypoglycemia was 3.7% with pioglitazone tablets 30 mg and 0.5% with placebo. In the 16-week add-on to insulin trial, the incidence of reported hypoglycemia was 7.9% with pioglitazone tablets 15 mg, 15.4% with pioglitazone tablets 30 mg, and 4.8% with placebo.

    The incidence of reported hypoglycemia was higher with pioglitazone tablets 45 mg compared to pioglitazone tablets 30 mg in both the 24-week add-on to sulfonylurea trial (15.7% vs. 13.4%) and in the 24-week add-on to insulin trial (47.8% vs. 43.5%).

    Three patients in these four trials were hospitalized due to hypoglycemia. All three patients were receiving pioglitazone tablets 30 mg (0.9%) in the 24-week add-on to insulin trial. An additional 14 patients reported severe hypoglycemia (defined as causing considerable interference with patient’s usual activities) that did not require hospitalization. These patients were receiving pioglitazone tablets 45 mg in combination with sulfonylurea (n=2) or pioglitazone tablets 30 mg or 45 mg in combination with insulin (n=12).

    Urinary Bladder Tumors

    Tumors were observed in the urinary bladder of male rats in the two-year carcinogenicity study [see Nonclinical Toxicology (13.1)]. During the three year PROactive clinical trial, 14 patients out of 2605 (0.54%) randomized to pioglitazone tablets and 5 out of 2633 (0.19%) randomized to placebo were diagnosed with bladder cancer. After excluding patients in whom exposure to study drug was less than one year at the time of diagnosis of bladder cancer, there were 6 (0.23%) cases on pioglitazone tablets and two (0.08%) cases on placebo. After completion of the trial, a large subset of patients was observed for up to 10 additional years, with little additional exposure to pioglitazone tablets. During the 13 years of both PROactive and observational follow-up, the occurrence of bladder cancer did not differ between patients randomized to pioglitazone tablets or placebo (HR =1.00; 95% CI: 0.59-1.72) [see Warnings and Precautions (5.4)].

    Laboratory Abnormalities

    Hematologic Effects

    Pioglitazone tablets may cause decreases in hemoglobin and hematocrit. In placebo-controlled monotherapy trials, mean hemoglobin values declined by 2% to 4% in patients treated with pioglitazone tablets compared with a mean change in hemoglobin of -1% to +1% in placebo-treated patients. These changes primarily occurred within the first 4 to 12 weeks of therapy and remained relatively constant thereafter. These changes may be related to increased plasma volume associated with pioglitazone tablets therapy and are not likely to be associated with any clinically significant hematologic effects.

    Creatine Phosphokinase

    During protocol-specified measurement of serum creatine phosphokinase (CPK) in pioglitazone tablets clinical trials, an isolated elevation in CPK to greater than 10 times the upper limit of the reference range was noted in nine (0.2%) patients treated with pioglitazone tablets (values of 2150 to 11400 IU/L) and in no comparator-treated patients. Six of these nine patients continued to receive pioglitazone tablets, two patients were noted to have the CPK elevation on the last day of dosing and one patient discontinued pioglitazone tablets due to the elevation. These elevations resolved without any apparent clinical sequelae. The relationship of these events to pioglitazone tablets therapy is unknown.

    6.2 Postmarketing Experience

    The following adverse reactions have been identified during post-approval use of pioglitazone tablets. Because these reactions are reported voluntarily from a population of uncertain size, it is generally not possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

    • New onset or worsening diabetic macular edema with decreased visual acuity [see Warnings and Precautions (5.7)].
    • Fatal and nonfatal hepatic failure [see Warnings and Precautions (5.3)].

    Postmarketing reports of congestive heart failure have been reported in patients treated with pioglitazone tablets, both with and without previously known heart disease and both with and without concomitant insulin administration.

    In postmarketing experience, there have been reports of unusually rapid increases in weight and increases in excess of that generally observed in clinical trials. Patients who experience such increases should be assessed for fluid accumulation and volume-related events such as excessive edema and congestive heart failure [see Boxed Warning and Warnings and Precautions (5.1)].

  • 7  DRUG INTERACTIONS

    7.1 Strong CYP2C8 Inhibitors

    An inhibitor of CYP2C8 (e.g., gemfibrozil) significantly increases the exposure (area under the serum concentration-time curve or AUC) and half-life (t½) of pioglitazone. Therefore, the maximum recommended dose of pioglitazone tablets is 15 mg daily if used in combination with gemfibrozil or other strong CYP2C8 inhibitors [see Dosage and Administration (2.3) and Clinical Pharmacology (12.3)].

    7.2 CYP2C8 Inducers

    An inducer of CYP2C8 (e.g., rifampin) may significantly decrease the exposure (AUC) of pioglitazone. Therefore, if an inducer of CYP2C8 is started or stopped during treatment with pioglitazone tablets, changes in diabetes treatment may be needed based on clinical response without exceeding the maximum recommended daily dose of 45 mg for pioglitazone tablets [see Clinical Pharmacology (12.3)].

    7.3 Topiramate

    A decrease in the exposure of pioglitazone and its active metabolites were noted with concomitant administration of pioglitazone and topiramate [see Clinical Pharmacology (12.3)]. The clinical relevance of this decrease is unknown; however, when pioglitazone tablets and topiramate are used concomitantly, monitor patients for adequate glycemic control.

  • 8  USE IN SPECIFIC POPULATIONS

    8.1 Pregnancy

    Risk Summary

    Limited data with pioglitazone tablets in pregnant women are not sufficient to determine a drug-associated risk for major birth defects or miscarriage. There are risks to the mother and fetus associated with poorly controlled diabetes in pregnancy [see Clinical Considerations].

    In animal reproduction studies, no adverse developmental effects were observed when pioglitazone was administered to pregnant rats and rabbits during organogenesis at exposures up to 5-and 35-times the 45 mg clinical dose, respectively, based on body surface area [see Data].

    The estimated background risk of major birth defects is 6-10% in women with pre-gestational diabetes with a HbA1c >7 and has been reported to be as high as 20-25% in women with a HbA1c >10. The estimated background risk of miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.

    Clinical Considerations

    Disease-associated maternal and/or embryo/fetal risk

    Poorly controlled diabetes in pregnancy increases the maternal risk for diabetic ketoacidosis, pre-eclampsia, spontaneous abortions, preterm delivery, still birth and delivery complications. Poorly controlled diabetes increases the fetal risk for major birth defects, still birth, and macrosomia related morbidity.

    Data

    Animal Data

    Pioglitazone administered to pregnant rats during organogenesis did not cause adverse developmental effects at a dose of 20 mg/kg (~5-times the 45 mg clinical dose), but delayed parturition and reduced embryofetal viability at 40 and 80 mg/kg, or ≥9-times the 45 mg clinical dose, by body surface area. In pregnant rabbits administered pioglitazone during organogenesis, no adverse developmental effects were observed at 80 mg/kg (~35-times the 45 mg clinical dose), but reduced embryofetal viability at 160 mg/kg, or ~69-times the 45 mg clinical dose, by body surface area. When pregnant rats received pioglitazone during late gestation and lactation, delayed postnatal development, attributed to decreased body weight, occurred in offspring at maternal doses of 10 mg/kg and above or ≥2 times the 45 mg clinical dose, by body surface area.

    8.2 Lactation

    Risk Summary

    There is no information regarding the presence of pioglitazone in human milk, the effects on the breastfed infant, or the effects on milk production. Pioglitazone is present in rat milk; however due to species-specific differences in lactation physiology, animal data may not reliably predict drug levels in human milk. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for pioglitazone tablets and any potential adverse effects on the breastfed infant from pioglitazone tablets or from the underlying maternal condition.

    8.3 Females and Males of Reproductive Potential

    Discuss the potential for unintended pregnancy with premenopausal women as therapy with pioglitazone tablets, like other thiazolidinediones, may result in ovulation in some anovulatory women.

    8.4 Pediatric Use

    Safety and effectiveness of pioglitazone tablets in pediatric patients have not been established.

    Pioglitazone tablets are not recommended for use in pediatric patients based on adverse effects observed in adults, including fluid retention and congestive heart failure, fractures, and urinary bladder tumors [see Warnings and Precautions (5.1, 5.4, 5.5 and 5.6)].

    8.5 Geriatric Use

    A total of 92 patients (15.2%) treated with pioglitazone tablets in the three pooled 16- to 26-week double-blind, placebo-controlled, monotherapy trials were ≥65 years old and two patients (0.3%) were ≥75 years old. In the two pooled 16- to 24-week add-on to sulfonylurea trials, 201 patients (18.7%) treated with pioglitazone tablets were ≥65 years old and 19 (1.8%) were ≥75 years old. In the two pooled 16- to 24-week add-on to metformin trials, 155 patients (15.5%) treated with pioglitazone tablets were ≥65 years old and 19 (1.9%) were ≥75 years old. In the two pooled 16- to 24-week add-on to insulin trials, 272 patients (25.4%) treated with pioglitazone tablets were ≥65 years old and 22 (2.1%) were ≥75 years old.

    In PROactive, 1068 patients (41.0%) treated with pioglitazone tablets were ≥65 years old and 42 (1.6%) were ≥75 years old.

    In pharmacokinetic studies with pioglitazone, no significant differences were observed in pharmacokinetic parameters between elderly and younger patients [see Clinical Pharmacology (12.3)].

    Although clinical experiences have not identified differences in effectiveness and safety between the elderly (≥65 years) and younger patients, these conclusions are limited by small sample sizes for patients ≥75 years old.

  • 10  OVERDOSAGE

    During controlled clinical trials, one case of overdose with pioglitazone tablets was reported. A male patient took 120 mg per day for four days, then 180 mg per day for seven days. The patient denied any clinical symptoms during this period.

    In the event of overdosage, appropriate supportive treatment should be initiated according to the patient’s clinical signs and symptoms.

  • 11  DESCRIPTION

    Pioglitazone tablets are a thiazolidinedione and an agonist for peroxisome proliferator-activated receptor (PPAR) gamma that contains an oral antidiabetic medication: pioglitazone.

    Pioglitazone [(±)-5-[[4-[2-(5-ethyl-2-pyridinyl) ethoxy] phenyl] methyl]-2,4-] thiazolidinedione monohydrochloride contains one asymmetric carbon, and the compound is synthesized and used as the racemic mixture. The two enantiomers of pioglitazone interconvert in vivo. No differences were found in the pharmacologic activity between the two enantiomers. The structural formula is as shown:

    Structural Formula

    Pioglitazone hydrochloride is an odorless white crystalline powder that has a molecular formula of C19H20N2O3SHCl and a molecular weight of 392.90 daltons. It is soluble in N,N-dimethylformamide, slightly soluble in anhydrous ethanol, very slightly soluble in acetone and acetonitrile, practically insoluble in water, and insoluble in ether.

    Pioglitazone tablets, USP, are available as tablets for oral administration containing 15 mg, 30 mg, or 45 mg of pioglitazone, USP, (as the base) formulated with the following excipients: lactose monohydrate NF, hydroxypropyl cellulose NF, carboxymethylcellulose calcium NF, and magnesium stearate NF.

  • 12  CLINICAL PHARMACOLOGY

    12.1 Mechanism of Action

    Pioglitazone is a thiazolidinedione that depends on the presence of insulin for its mechanism of action. Pioglitazone tablets decrease insulin resistance in the periphery and in the liver resulting in increased insulin-dependent glucose disposal and decreased hepatic glucose output. Pioglitazone is not an insulin secretagogue. Pioglitazone is an agonist for peroxisome proliferator-activated receptor-gamma (PPARγ). PPAR receptors are found in tissues important for insulin action such as adipose tissue, skeletal muscle, and liver. Activation of PPARγ nuclear receptors modulates the transcription of a number of insulin responsive genes involved in the control of glucose and lipid metabolism.

    In animal models of diabetes, pioglitazone reduces the hyperglycemia, hyperinsulinemia, and hypertriglyceridemia characteristic of insulin-resistant states such as type 2 diabetes. The metabolic changes produced by pioglitazone result in increased responsiveness of insulin-dependent tissues and are observed in numerous animal models of insulin resistance.

    Because pioglitazone enhances the effects of circulating insulin (by decreasing insulin resistance), it does not lower blood glucose in animal models that lack endogenous insulin.

    12.2 Pharmacodynamics

    Clinical studies demonstrate that pioglitazone tablets improve insulin sensitivity in insulin-resistant patients. Pioglitazone tablets enhance cellular responsiveness to insulin, increase insulin-dependent glucose disposal and improve hepatic sensitivity to insulin. In patients with type 2 diabetes, the decreased insulin resistance produced by pioglitazone tablets results in lower plasma glucose concentrations, lower plasma insulin concentrations, and lower HbA1c values. In controlled clinical trials, pioglitazone tablets had an additive effect on glycemic control when used in combination with a sulfonylurea, metformin, or insulin [see Clinical Studies (14.2)].

    Patients with lipid abnormalities were included in clinical trials with pioglitazone tablets. Overall, patients treated with pioglitazone tablets had mean decreases in serum triglycerides, mean increases in HDL cholesterol, and no consistent mean changes in LDL and total cholesterol. There is no conclusive evidence of macrovascular benefit with pioglitazone tablet [see Warnings and Precautions (5.8) and Adverse Reactions (6.1)].

    In a 26-week, placebo-controlled, dose-ranging monotherapy study, mean serum triglycerides decreased in the 15 mg, 30 mg, and 45 mg pioglitazone tablets dose groups compared to a mean increase in the placebo group. Mean HDL cholesterol increased to a greater extent in patients treated with pioglitazone tablets than in the placebo-treated patients. There were no consistent differences for LDL and total cholesterol in patients treated with pioglitazone tablets compared to placebo (see Table 14).

    Table 14. Lipids in a 26-Week Placebo-Controlled Monotherapy Dose-Ranging Study
    PlaceboPioglitazone Tablets 15 mg Once DailyPioglitazone Tablets 30 mg Once DailyPioglitazone Tablets 45 mg Once Daily
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction 
    † p<0.05 versus placebo 

    Triglycerides (mg/dL)

    N=79

    N=79

    N=84

    N=77

    Baseline (mean)

    263

    284

    261

    260

    Percent change from baseline (adjusted mean*)

    4.8%

    -9.0%†

    -9.6%†

    -9.3%†

    HDL Cholesterol (mg/dL)

    N=79

    N=79

    N=83

    N=77

    Baseline (mean)

    42

    40

    41

    41

    Percent change from baseline (adjusted mean*)

    8.1%

    14.1%†

    12.2%

    19.1%†

    LDL Cholesterol (mg/dL)

    N=65

    N=63

    N=74

    N=62

    Baseline (mean)

    139

    132

    136

    127

    Percent change from baseline (adjusted mean*)

    4.8%

    7.2%

    5.2%

    6.0%

    Total Cholesterol (mg/dL)

    N=79

    N=79

    N=84

    N=77

    Baseline (mean)

    225

    220

    223

    214

    Percent change from baseline (adjusted mean*)

    4.4%

    4.6%

    3.3%

    6.4%

    In the two other monotherapy studies (16 weeks and 24 weeks) and in combination therapy studies with sulfonylurea (16 weeks and 24 weeks), metformin (16 weeks and 24 weeks) or insulin (16 weeks and 24 weeks), the results were generally consistent with the data above.

    12.3 Pharmacokinetics

    Following once-daily administration of pioglitazone tablets, steady-state serum concentrations of both pioglitazone and its major active metabolites, M-III (keto derivative of pioglitazone) and M-IV (hydroxyl derivative of pioglitazone), are achieved within seven days. At steady-state, M-III and M-IV reach serum concentrations equal to or greater than that of pioglitazone. At steady-state, in both healthy volunteers and patients with type 2 diabetes, pioglitazone comprises approximately 30% to 50% of the peak total pioglitazone serum concentrations (pioglitazone plus active metabolites) and 20% to 25% of the total AUC.

    Cmax, AUC, and trough serum concentrations (Cmin) for pioglitazone and M-III and M-IV, increased proportionally with administered doses of 15 mg and 30 mg per day.

    Absorption

    Following oral administration of pioglitazone, Tmax of pioglitazone was within two hours. Food delays the Tmax to three to four hours but does not alter the extent of absorption (AUC).

    Distribution

    The mean apparent volume of distribution (Vd/F) of pioglitazone following single-dose administration is 0.63 ± 0.41 (mean ± SD) L/kg of body weight. Pioglitazone is extensively protein bound (>99%) in human serum, principally to serum albumin. Pioglitazone also binds to other serum proteins, but with lower affinity. M-III and M-IV are also extensively bound (>98%) to serum albumin.

    Metabolism

    Pioglitazone is extensively metabolized by hydroxylation and oxidation; the metabolites also partly convert to glucuronide or sulfate conjugates. Metabolites M-III and M-IV are the major circulating active metabolites in humans.

    In vitro data demonstrate that multiple CYP isoforms are involved in the metabolism of pioglitazone, which include CYP2C8 and, to a lesser degree, CYP3A4 with additional contributions from a variety of other isoforms including the mainly extrahepatic CYP1A1. In vivo study of pioglitazone in combination with gemfibrozil, a strong CYP2C8 inhibitor, showed that pioglitazone is a CYP2C8 substrate [see Dosage and Administration (2.3) and Drug Interactions (7)]. Urinary 6ß-hydroxycortisol/cortisol ratios measured in patients treated with pioglitazone tablets showed that pioglitazone is not a strong CYP3A4 enzyme inducer.

    Excretion and Elimination

    Following oral administration, approximately 15% to 30% of the pioglitazone dose is recovered in the urine. Renal elimination of pioglitazone is negligible, and the drug is excreted primarily as metabolites and their conjugates. It is presumed that most of the oral dose is excreted into the bile either unchanged or as metabolites and eliminated in the feces.

    The mean serum half-life (t1/2) of pioglitazone and its metabolites (M-III and M-IV) range from three to seven hours and 16 to 24 hours, respectively. Pioglitazone has an apparent clearance, CL/F, calculated to be five to seven L/hr.

    Renal Impairment

    The serum elimination half-life of pioglitazone, M-III, and M-IV remains unchanged in patients with moderate (creatinine clearance [CLcr] 30 to 50 mL/min) and severe (CLcr <30 mL/min) renal impairment when compared to subjects with normal renal function. Therefore, no dose adjustment in patients with renal impairment is required.

    Hepatic Impairment

    Compared with healthy controls, subjects with impaired hepatic function (Child-Turcotte-Pugh Grade B/C) have an approximate 45% reduction in pioglitazone and total pioglitazone (pioglitazone, M-III, and M-IV) mean Cmax but no change in the mean AUC values. Therefore, no dose adjustment in patients with hepatic impairment is required.

    There are postmarketing reports of liver failure with pioglitazone tablets and clinical trials have generally excluded patients with serum ALT >2.5 times the upper limit of the reference range. Use caution in patients with liver disease [see Warnings and Precautions (5.3)].

    Geriatric Patients

    In healthy elderly subjects, Cmax of pioglitazone was not significantly different, but AUC values were approximately 21% higher than those achieved in younger subjects. The mean t1/2 of pioglitazone was also prolonged in elderly subjects (about ten hours) as compared to younger subjects (about seven hours). These changes were not of a magnitude that would be considered clinically relevant.

    Pediatric Patients

    Safety and efficacy of pioglitazone in pediatric patients have not been established. Pioglitazone tablets are not recommended for use in pediatric patients [see Use in Specific Populations (8.4)].

    Gender

    The mean Cmax and AUC values of pioglitazone were increased 20% to 60% in women compared to men. In controlled clinical trials, HbA1c decreases from baseline were generally greater for females than for males (average mean difference in HbA1c 0.5%). Because therapy should be individualized for each patient to achieve glycemic control, no dose adjustment is recommended based on gender alone.

    Ethnicity

    Pharmacokinetic data among various ethnic groups are not available.

    Drug-Drug Interactions

    Table 15. Effect of Pioglitazone Coadministration on Systemic Exposure of Other Drugs
    Coadministered Drug
    * Daily for 7 days unless otherwise noted
    † % change (with/without coadministered drug and no change = 0%); symbols of ↑ and ↓ indicate the exposure increase and decrease, respectively 
    ‡ Pioglitazone had no clinically significant effect on prothrombin time 
     

    Pioglitazone Dosage Regimen (mg)*

    Name and Dose Regimens

    Change in AUC†

    Change in Cmax†

    Warfarin‡

    45 mg

    Daily loading then maintenance doses based PT and INR values Quick's Value = 35 ± 5%

    R-Warfarin

    ↓ 3%

    R-Warfarin

    ↓ 2%

    (N = 12)

    S-Warfarin

    ↓ 1%

    S-Warfarin

    ↑ 1%

    45 mg

    Digoxin

    (N = 12)

    0.200 mg twice daily (loading dose) then 0.250 mg daily (maintenance dose, 7 days)

    ↑ 15%

    ↑ 17%

    45 mg daily for 21 days

    Oral Contraceptive

    (N = 35)

    [Ethinyl Estradiol (EE) 0.035 mg plus Norethindrone (NE) 1 mg] for 21 days

    EE

    ↓ 11%

    EE

    ↓ 13%

    NE

    ↑  3%

    NE

    ↓ 7%

    45 mg

    Fexofenadine

    (N = 23)

    60 mg twice daily for 7 days

    ↑ 30%

    ↑ 37%

    45 mg

    Glipizide

    (N = 14)

    5 mg daily for 7 days

    ↓ 3%

    ↓ 8%

    45 mg daily for 8 days

    Metformin

    (N = 16)

    1000 mg single dose on Day 8

    ↓ 3%

    ↓ 5%

    45 mg

    Midazolam

    (N = 21)

    7.5 mg single dose on Day 15

    ↓ 26%

    ↓ 26%

    45 mg

    Ranitidine

    (N = 24)

    150 mg twice daily for 7 days

    ↑ 1%

    ↓ 1%

    45 mg daily for 4 days

    Nifedipine ER

    (N = 24)

    30 mg daily for 4 days

    ↓ 13%

    ↓ 17%

    45 mg

    Atorvastatin Ca

    (N = 25)

    80 mg daily for 7 days

    ↓ 14%

    ↓ 23%

    45 mg

    Theophylline

    (N = 22)

    400 mg twice daily for 7 days

    ↑ 2%

    ↑ 5%

    Table 16. Effect of Coadministered Drugs on Pioglitazone Systemic Exposure
    Coadministered Drug and Dosage RegimenPioglitazone
    Dose Regimen (mg)*Change in AUC†Change in Cmax†
    * Daily for 7 days unless otherwise noted
    † Mean ratio (with/without coadministered drug and no change = 1-fold) % change (with/without coadministered drug and no change = 0%); symbols of ↑ and ↓ indicate the exposure increase and decrease, respectively
    ‡ The half-life of pioglitazone increased from 8.3 hours to 22.7 hours in the presence of gemfibrozil [see Dosage and Administration (2.3) and Drug Interactions (7.1)]
    §Indicates duration of concomitant administration with highest twice-daily dose of topiramate from Day 14 onwards over the 22 days of study
    Additional decrease in active metabolites; 60% for M-III and 16% for M-IV

    Gemfibrozil 600 mg twice daily for 2 days

    15 mg single dose

    ↑ 3.2-fold‡

    ↑ 6%

    (N = 12)

    Ketoconazole 200 mg twice daily for 7 days

    45 mg

    ↑34%

    ↑14%

    (N = 28)

    Rifampin 600 mg daily for 5 days

    30 mg single dose

    ↓ 54%

    ↓ 5%

    (N = 10)

    Fexofenadine 60 mg twice daily for 7 days

    45 mg

    ↑1%

    0%

    (N = 23)

    Ranitidine 150 mg twice daily for 4 days

    45 mg

    ↓ 13%

    ↓ 16%

    (N = 23)

    Nifedipine ER 30 mg daily for 7 days

    45 mg

    ↑5%

    ↑4%

    (N = 23)

    Atorvastatin Ca 80 mg daily for 7 days

    45 mg

    ↓ 24%

    ↓ 31%

    (N = 24)

    Theophylline 400 mg twice daily for 7 days (N = 22)

    45 mg

    ↓ 4%

    ↓ 2%

    Topiramate 96 mg twice daily for 7 days§      (N = 26)

    30 mg§

    ↓15%

    0%

  • 13  NONCLINICAL TOXICOLOGY

    13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

    A two-year carcinogenicity study was conducted in male and female rats at oral doses up to 63 mg/kg (approximately 14 times the maximum recommended human oral dose of 45 mg based on mg/m2). Drug-induced tumors were not observed in any organ except for the urinary bladder of male rats. Benign and/or malignant transitional cell neoplasms were observed in male rats at 4 mg/kg/day and above (approximately equal to the maximum recommended human oral dose based on mg/m2). Urinary calculi with subsequent irritation and hyperplasia were postulated as the mechanism for bladder tumors observed in male rats. A two-year mechanistic study in male rats utilizing dietary acidification to reduce calculi formation was completed in 2009. Dietary acidification decreased but did not abolish the hyperplastic changes in the bladder. The presence of calculi exacerbated the hyperplastic response to pioglitazone but was not considered the primary cause of the hyperplastic changes.

    The relevance to humans of the bladder findings in the male rat cannot be excluded.

    A two-year carcinogenicity study was also conducted in male and female mice at oral doses up to 100 mg/kg/day (approximately 11 times the maximum recommended human oral dose based on mg/m2). No drug-induced tumors were observed in any organ.

    Pioglitazone hydrochloride was not mutagenic in a battery of genetic toxicology studies, including the Ames bacterial assay, a mammalian cell forward gene mutation assay (CHO/HPRT and AS52/XPRT), an in vitro cytogenetics assay using CHL cells, an unscheduled DNA synthesis assay, and an in vivo micronucleus assay.

    No adverse effects upon fertility were observed in male and female rats at oral doses up to 40 mg/kg pioglitazone hydrochloride daily prior to and throughout mating and gestation (approximately nine times the maximum recommended human oral dose based on mg/m2).

    13.2 Animal Toxicology and/or Pharmacology

    Heart enlargement has been observed in mice (100 mg/kg), rats (4 mg/kg and above) and dogs (3 mg/kg) treated orally with pioglitazone hydrochloride (approximately 11, 1, and 2 times the maximum recommended human oral dose for mice, rats, and dogs, respectively, based on mg/m2). In a one-year rat study, drug-related early death due to apparent heart dysfunction occurred at an oral dose of 160 mg/kg/day (approximately 35 times the maximum recommended human oral dose based on mg/m2). Heart enlargement was seen in a 13-week study in monkeys at oral doses of 8.9 mg/kg and above (approximately four times the maximum recommended human oral dose based on mg/m2), but not in a 52-week study at oral doses up to 32 mg/kg (approximately 13 times the maximum recommended human oral dose based on mg/m2).

  • 14  CLINICAL STUDIES

    14.1 Monotherapy

    Three randomized, double-blind, placebo-controlled trials with durations from 16 to 26 weeks were conducted to evaluate the use of pioglitazone tablets as monotherapy in patients with type 2 diabetes. These trials examined pioglitazone tablets at doses up to 45 mg or placebo once daily in a total of 865 patients.

    In a 26-week dose-ranging monotherapy trial, 408 patients with type 2 diabetes were randomized to receive 7.5 mg, 15 mg, 30 mg, or 45 mg of pioglitazone tablets, or placebo once daily. Therapy with any previous antidiabetic agent was discontinued eight weeks prior to the double-blind period. Treatment with 15 mg, 30 mg, and 45 mg of pioglitazone tablets produced statistically significant improvements in HbA1c and fasting plasma glucose (FPG) at endpoint compared to placebo (see Figure 1, Table 17).

    Figure 1 shows the time course for changes in HbA1c in this 26-week study.

    Figure 1. Mean Change from Baseline for HbA1c in a 26-Week Placebo-Controlled Dose-Ranging Study (Observed Values)

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    Table 17. Glycemic Parameters in a 26-Week Placebo-Controlled Dose-Ranging Monotherapy Trial

    Table 17. Glycemic Parameters in a 26-Week Placebo-Controlled Dose-Ranging Monotherapy Trial
    PlaceboPioglitazone Tablets 15 mg Once DailyPioglitazone Tablets 30 mg Once DailyPioglitazone Tablets 45 mg Once Daily
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction 
    † p≤0.05 vs. placebo 

    Total Population

    HbA1c (%)

    N=79

    N=79

    N=85

    N=76

    Baseline (mean)

    10.4

    10.2

    10.2

    10.3

    Change from baseline (adjusted mean*)

    0.7

    -0.3

    -0.3

    -0.9

    Difference from placebo (adjusted mean*)

    -1.0†

    -1.0†

    -1.6†

    95% Confidence Interval

    (-1.6, -0.4)

    (-1.6, -0.4)

    (-2.2, -1.0)

    Fasting Plasma Glucose (mg/dL)

    N=79

    N=79

    N=84

    N=77

    Baseline (mean)

    268

    267

    269

    276

    Change from baseline (adjusted mean*)

    9

    -30

    -32

    -56

    Difference from placebo (adjusted mean*)

    -39†

    -41†

    -65†

    95% Confidence Interval

    (-63, -16)

    (-64, -18)

    (-89, -42)

    In a 24-week placebo-controlled monotherapy trial, 260 patients with type 2 diabetes were randomized to one of two forced-titration pioglitazone tablets treatment groups or a mock-titration placebo group. Therapy with any previous antidiabetic agent was discontinued six weeks prior to the double-blind period. In one pioglitazone tablets treatment group, patients received an initial dose of 7.5 mg once daily. After four weeks, the dose was increased to 15 mg once daily and after another four weeks, the dose was increased to 30 mg once daily for the remainder of the trial (16 weeks). In the second pioglitazone tablets treatment group, patients received an initial dose of 15 mg once daily and were titrated to 30 mg once daily and 45 mg once daily in a similar manner. Treatment with pioglitazone tablets, as described, produced statistically significant improvements in HbA1c and FPG at endpoint compared to placebo (see Table 18).

    Table 18. Glycemic Parameters in a 24-Week Placebo-Controlled Forced-Titration Monotherapy Trial
    PlaceboPioglitazone Tablets 30 mg* Once DailyPioglitazone Tablets 45 mg* Once Daily
    * Final dose in forced titration 
    † Adjusted for baseline, pooled center, and pooled center by treatment interaction 
    ‡ p≤0.05 vs. placebo 

    Total Population

    HbA1c (%)

    N=83

    N=85

    N=85

    Baseline (mean)

    10.8

    10.3

    10.8

    Change from baseline (adjusted mean†)

    0.9

    -0.6

    -0.6

    Difference from placebo (adjusted mean†)

    -1.5‡

    -1.5‡

    95% Confidence Interval

    (-2.0, -1.0)

    (-2.0, -1.0)

    Fasting Plasma Glucose (mg/dL)

    N=78

    N=82

    N=85

    Baseline (mean)

    279

    268

    281

    Change from baseline (adjusted mean†)

    18

    -44

    -50

    Difference from placebo (adjusted mean†)

    -62‡

    -68‡

    95% Confidence Interval

    (-82, -0.41)

    (-88, -0.48)

    In a 16-week monotherapy trial, 197 patients with type 2 diabetes were randomized to treatment with 30 mg of pioglitazone tablets or placebo once daily. Therapy with any previous antidiabetic agent was discontinued six weeks prior to the double-blind period. Treatment with 30 mg of pioglitazone tablets produced statistically significant improvements in HbA1c and FPG at endpoint compared to placebo (see Table 19).

    Table 19. Glycemic Parameters in a 16-Week Placebo-Controlled Monotherapy Trial
    PlaceboPioglitazone Tablets 30 mg Once Daily
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction 
    † p≤0.050 vs. placebo 

    Total Population

    HbA1c (%)

    N=93

    N=100

    Baseline (mean)

    10.3

    10.5

    Change from baseline (adjusted mean*)

    0.8

    -0.6

    Difference from placebo (adjusted mean*)

    -1.4†

    95% Confidence Interval

    (-1.8, -0.9)

    Fasting Plasma Glucose (mg/dL)

    N=91

    N=99

    Baseline (mean)

    270

    273

    Change from baseline (adjusted mean*)

    8

    -50

    Difference from placebo (adjusted mean*)

    -58†

    95% Confidence Interval

    (-77, -38)

    14.2 Combination Therapy

    Three 16-week, randomized, double-blind, placebo-controlled clinical trials were conducted to evaluate the effects of pioglitazone tablets (15 mg and/or 30 mg) on glycemic control in patients with type 2 diabetes who were inadequately controlled (HbA1c ≥8%) despite current therapy with a sulfonylurea, metformin, or insulin. In addition, three 24-week randomized, double-blind clinical trials were conducted to evaluate the effects of pioglitazone tablets 30 mg vs. Pioglitazone tablets 45 mg on glycemic control in patients with type 2 diabetes who were inadequately controlled (HbA1c ≥8%) despite current therapy with a sulfonylurea, metformin, or insulin. Previous diabetes treatment may have been monotherapy or combination therapy.

    Add-on to Sulfonylurea Trials

    Two clinical trials were conducted with pioglitazone tablets in combination with a sulfonylurea. Both studies included patients with type 2 diabetes on any dose of a sulfonylurea, either alone or in combination with another antidiabetic agent. All other antidiabetic agents were withdrawn at least three weeks prior to starting study treatment.

    In the first study, 560 patients were randomized to receive 15 mg or 30 mg of pioglitazone tablets or placebo once daily for 16 weeks in addition to their current sulfonylurea regimen. Treatment with pioglitazone tablets as add-on to sulfonylurea produced statistically significant improvements in HbA1c and FPG at endpoint compared to placebo add-on to sulfonylurea (Table 20).

    Table 20. Glycemic Parameters in a 16-Week Placebo-Controlled, Add-on to Sulfonylurea Trial
    Placebo + SulfonylureaPioglitazone Tablets 15 mg + SulfonylureaPioglitazone Tablets 30 mg + Sulfonylurea
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction 
    † p≤0.05 vs. placebo + sulfonylurea 

    Total Population

    HbA1c (%)

    N=181

    N=176

    N=182

    Baseline (mean)

    9.9

    10.0

    9.9

    Change from baseline (adjusted mean*)

    0.1

    -0.8

    -1.2

    Difference from placebo + sulfonylurea (adjusted mean*) 95% Confidence Interval

    -0.9†

    -1.3†

    (-1.2, -0.6)

    (-1.6, -1.0)

    Fasting Plasma Glucose (mg/dL)

    N=182

    N=179

    N=186

    Baseline (mean)

    236

    247

    239

    Change from baseline (adjusted mean*)

    6

    -34

    -52

    Difference from placebo + sulfonylurea (adjusted mean*) 95% Confidence Interval

    -39†

    -58†

    (-52, -27)

    (-70, -46)

    In the second trial, 702 patients were randomized to receive 30 mg or 45 mg of pioglitazone tablets once daily for 24 weeks in addition to their current sulfonylurea regimen. The mean reduction from baseline at Week 24 in HbA1c was 1.6% for the 30 mg dose and 1.7% for the 45 mg dose (see Table 21). The mean reduction from baseline at Week 24 in FPG was 52 mg/dL for the 30 mg dose and 56 mg/dL for the 45 mg dose.

    The therapeutic effect of pioglitazone tablets in combination with sulfonylurea was observed in patients regardless of the sulfonylurea dose.

    Table 21. Glycemic Parameters in a 24-Week Add-on to Sulfonylurea Trial
    Pioglitazone Tablets Pioglitazone Tablets
    30 mg + Sulfonylurea45 mg + Sulfonylurea
    95% CI = 95% confidence interval 
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction

    Total Population

    HbA1c (%)

    N=340

    N=332

    Baseline (mean)

    9.8

    9.9

    Change from baseline (adjusted mean*)

    -1.6

    -1.7

    Difference from 30 mg daily pioglitazone tablets

    -0.1

    + sulfonylurea (adjusted mean*) (95% CI)

    (-0.4, 0.1)

    Fasting Plasma Glucose (mg/dL)

    N=338

    N=329

    Baseline (mean)

    214

    217

    Change from baseline (adjusted mean*)

    -52

    -56

    Difference from 30 mg daily pioglitazone tablets

    -5

    + sulfonylurea (adjusted mean*) (95% CI)

    (-12, 3)

    Add-on to Metformin Trials

    Two clinical trials were conducted with pioglitazone tablets in combination with metformin. Both trials included patients with type 2 diabetes on any dose of metformin, either alone or in combination with another antidiabetic agent. All other antidiabetic agents were withdrawn at least three weeks prior to starting study treatment.

    In the first trial, 328 patients were randomized to receive either 30 mg of pioglitazone tablets or placebo once daily for 16 weeks in addition to their current metformin regimen. Treatment with pioglitazone tablets as add-on to metformin produced statistically significant improvements in HbA1c and FPG at endpoint compared to placebo add-on to metformin (see Table 22).

    Table 22. Glycemic Parameters in a 16-Week Placebo-Controlled, Add-on to Metformin Trial
    Placebo + MetforminPioglitazone Tablets 30 mg + Metformin
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction
    † p≤0.05 vs. placebo + metformin

    Total Population

    HbA1c (%)

    N=153

    N=161

    Baseline (mean)

    9.8

    9.9

    Change from baseline (adjusted mean*)

    0.2

    -0.6

    Difference from placebo + metformin (adjusted mean*) 95% Confidence Interval

    -0.8†

    (-1.2, -0.5)

    Fasting Plasma Glucose (mg/dL)

    N=157

    N=165

    Baseline (mean)

    260

    254

    Change from baseline (adjusted mean*)

    -5

    -43

    Difference from placebo + metformin (adjusted

    -38†

    mean*) 95% Confidence Interval

    (-49, -26)

    In the second trial, 827 patients were randomized to receive either 30 mg or 45 mg of pioglitazone tablets once daily for 24 weeks in addition to their current metformin regimen. The mean reduction from baseline at Week 24 in HbA1c was 0.8% for the 30 mg dose and 1.0% for the 45 mg dose (see Table 23). The mean reduction from baseline at Week 24 in FPG was 38 mg/dL for the 30 mg dose and 51 mg/dL for the 45 mg dose.

    Table 23. Glycemic Parameters in a 24-Week Add-on to Metformin Study
    Pioglitazone Tablets Pioglitazone Tablets
    30 mg + Metformin45 mg + Metformin
    95% CI = 95% confidence interval 
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction 
    † p≤0.05 vs. 30 mg daily pioglitazone tablets + metformin

    Total Population

    HbA1c (%)

    N=400

    N=398

    Baseline (mean)

    9.9

    9.8

    Change from baseline (adjusted mean*)

    -0.8

    -1.0

    Difference from 30 mg daily Pioglitazone Tablets

    -0.2

    + Metformin (adjusted mean*) (95% CI)

    (-0.5, 0.1)

    Fasting Plasma Glucose (mg/dL)

    N=398

    N=399

    Baseline (mean)

    233

    232

    Change from baseline (adjusted mean*)

    -38

    -51

    Difference from 30 mg daily Pioglitazone Tablets

    -12†

    + Metformin (adjusted mean*) (95% CI)

    (-21, -4)

    The therapeutic effect of pioglitazone tablets in combination with metformin was observed in patients regardless of the metformin dose.

    Add-on to Insulin Trials

    Two clinical trials were conducted with pioglitazone tablets in combination with insulin. Both trials included patients with type 2 diabetes on insulin, either alone or in combination with another antidiabetic agent. All other antidiabetic agents were withdrawn prior to starting study treatment. In the first trial, 566 patients were randomized to receive either 15 mg or 30 mg of pioglitazone tablets or placebo once daily for 16 weeks in addition to their insulin regimen. Treatment with pioglitazone tablets as add-on to insulin produced statistically significant improvements in HbA1c and FPG at endpoint compared to placebo add-on to insulin (see Table 24). The mean daily insulin dose at baseline in each treatment group was approximately 70 units. The majority of patients (75% overall, 86% treated with placebo, 77% treated with pioglitazone tablets 15 mg, and 61% treated with pioglitazone tablets 30 mg) had no change in their daily insulin dose from baseline to the final study visit. The mean change from baseline in daily dose of insulin (including patients with no insulin dose modifications) was -3 units in the patients treated with pioglitazone tablets 15 mg, -8 units in the patients treated with pioglitazone tablets 30 mg, and -1 unit in patients treated with placebo.

    Table 24. Glycemic Parameters in a 16-Week Placebo-Controlled, Add-on to Insulin Trial
    Placebo + InsulinPioglitazone Tablets 15 mg + InsulinPioglitazone Tablets 30 mg + Insulin
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction 
    † p≤0.05 vs. placebo + insulin 

    Total Population

    HbA1c (%)

    N=177

    N=177

    N=185

    Baseline (mean)

    9.8

    9.8

    9.8

    Change from baseline (adjusted mean*)

    -0.3

    -1.0

    -1.3

    Difference from placebo + Insulin (adjusted mean*) 95% Confidence Interval

    -0.7†

    -1.0†

    (-1.0, -0.5)

    (-1.3, -0.7)

    Fasting Plasma Glucose (mg/dL)

    N=179

    N=183

    N=184

    Baseline (mean)

    221

    222

    229

    Change from baseline (adjusted mean*)

    1

    -35

    -48

    Difference from placebo + Insulin (adjusted mean*) 95% Confidence Interval

    -35†

    -49†

    (-51, -19)

    (-65, -33)

    In the second trial, 690 patients receiving a median of 60 units per day of insulin were randomized to receive either 30 mg or 45 mg of pioglitazone tablets once daily for 24 weeks in addition to their current insulin regimen. The mean reduction from baseline at Week 24 in HbA1c was 1.2% for the 30 mg dose and 1.5% for the 45 mg dose. The mean reduction from baseline at Week 24 in FPG was 32 mg/dL for the 30 mg dose and 46 mg/dL for the 45 mg dose (see Table 25). The mean daily insulin dose at baseline in both treatment groups was approximately 70 units. The majority of patients (55% overall, 58% treated with pioglitazone tablets 30 mg, and 52% treated with pioglitazone tablets 45 mg) had no change in their daily insulin dose from baseline to the final study visit. The mean change from baseline in daily dose of insulin (including patients with no insulin dose modifications) was -5 units in the patients treated with pioglitazone tablets 30 mg and -8 units in the patients treated with pioglitazone tablets 45 mg.

    The therapeutic effect of pioglitazone tablets in combination with insulin was observed in patients regardless of the insulin dose.

    Table 25. Glycemic Parameters in a 24-Week Add-on to Insulin Trial
    Pioglitazone Tablets 30 mg + InsulinPioglitazone Tablets 45 mg + Insulin
    95% CI = 95% confidence interval 
    * Adjusted for baseline, pooled center, and pooled center by treatment interaction 
    † p≤0.05 vs. 30 mg daily pioglitazone tablets + insulin 

    Total Population

    HbA1c (%)

    N=328

    N=328

    Baseline (mean)

    9.9

    9.7

    Change from baseline (adjusted mean*)

    -1.2

    -1.5

    Difference from 30 mg daily Pioglitazone Tablets+ Insulin (adjusted mean*) (95% CI)

    -0.3†

    (-0.5, -0.1)

    Fasting Plasma Glucose (mg/dL)

    N=325

    N=327

    Baseline (mean)

    202

    199

    Change from baseline (adjusted mean*)

    -32

    -46

    Difference from 30 mg daily Pioglitazone Tablets

    -14†

    + Insulin (adjusted mean*) (95% CI)

    (-25, -3)
  • 16  HOW SUPPLIED/STORAGE AND HANDLING 

    Pioglitazone tablets, USP, are available in 15 mg, 30 mg, and 45 mg tablets as follows:

    15 mg tablet: White to off-white, round, convex, nonscored tablet with “295” on one side, and “S” on the other, available in:

    NDC: 43547-426-03         Bottles of 30

    NDC: 43547-426-09         Bottles of 90

    NDC: 43547-426-50         Bottles of 500

    30 mg tablet: White to off-white, round, flat, nonscored tablet with “293” on one side, and “S” on the other, available in:

    NDC: 43547-427-03         Bottles of 30

    NDC: 43547-427-09         Bottles of 90

    NDC: 43547-427-50         Bottles of 500

    45 mg tablet: White to off-white, round, flat, nonscored tablet with “294” on one side, and “S” on the other, available in:

    NDC: 43547-428-03         Bottles of 30

    NDC: 43547-428-09         Bottles of 90

    NDC: 43547-428-50         Bottles of 500

    Storage

    Store at 20-25oC (68-77oF); excursions permitted to 15-30°C (59-86°F) [see USP Controlled Room Temperature]. Keep container tightly closed, and protect from light, moisture and humidity.

  • 17  PATIENT COUNSELING INFORMATION

    See FDA-Approved Patient Labeling (Medication Guide).

    • It is important to instruct patients to adhere to dietary instructions and to have blood glucose and glycosylated hemoglobin tested regularly. During periods of stress such as fever, trauma, infection, or surgery, medication requirements may change and patients should be reminded to seek medical advice promptly.
    • Patients who experience an unusually rapid increase in weight or edema or who develop shortness of breath or other symptoms of heart failure while on pioglitazone tablets should immediately report these symptoms to a physician.
    • Tell patients to promptly stop taking pioglitazone tablets and seek immediate medical advice if there is unexplained nausea, vomiting, abdominal pain, fatigue, anorexia, or dark urine as these symptoms may be due to hepatotoxicity.
    • Tell patients to promptly report any sign of macroscopic hematuria or other symptoms such as dysuria or urinary urgency that develop or increase during treatment as these may be due to bladder cancer.
    • Tell patients to take pioglitazone tablets once daily. Pioglitazone tablets can be taken with or without meals. If a dose is missed on one day, the dose should not be doubled the following day.
    • When using combination therapy with insulin or other antidiabetic medications, the risks of hypoglycemia, its symptoms and treatment, and conditions that predispose to its development should be explained to patients and their family members.
    • Inform female patients that treatment with pioglitazone tablets, like other thiazolidinediones, may result in an unintended pregnancy in some premenopausal anovulatory females due to its effect on ovulation [see Use in Specific Populations (8.3)].

    Distributed by:

    Solco Healthcare US, LLC

    Cranbury, NJ 08512, USA

    Manufactured by:

    Zhejiang Huahai Pharmaceutical Co., Ltd.

    Xunqiao, Linhai, Zhejiang 317024, China

    Revised: 02/2018

    17748-02

  • MEDICATION GUIDE

    Pioglitazone Tablets, USP

    (pie-oh-GLIT-ah-zohn)

    Read this Medication Guide carefully before you start taking pioglitazone tablets and each time you get a refill. There may be new information. This information does not take the place of talking with your doctor about your medical condition or your treatment. If you have any questions about pioglitazone tablets, ask your doctor or pharmacist.

    What is the most important information I should know about pioglitazone tablets?

    Pioglitazone tablets can cause serious side effects, including new or worse heart failure.

    • Pioglitazone tablets can cause your body to keep extra fluid (fluid retention), which leads to swelling (edema) and weight gain. Extra body fluid can make some heart problems worse or lead to heart failure. Heart failure means your heart does not pump blood well enough
    • Do not take pioglitazone tablets if you have severe heart failure
    • If you have heart failure with symptoms (such as shortness of breath or swelling), even if these symptoms are not severe, pioglitazone tablets may not be right for you

    Call your doctor right away if you have any of the following:

    • swelling or fluid retention, especially in the ankles or legs
    • shortness of breath or trouble breathing, especially when you lie down
    • an unusually fast increase in weight
    • unusual tiredness

    Pioglitazone tablets can have other serious side effects. See “What are the possible side effects of pioglitazone tablets?”

    What are pioglitazone tablets?

    Pioglitazone tablets are prescription medicines used with diet and exercise to improve blood sugar (glucose) control in adults with type 2 diabetes. Pioglitazone tablets are diabetes medicines called pioglitazone that may be taken alone or with other diabetes medicines.

    It is not known if pioglitazone tablets are safe and effective in children under the age of 18.

    Pioglitazone tablets are not recommended for use in children.

    Pioglitazone tablets are not for people with type 1 diabetes.

    Pioglitazone tablets are not for people with diabetic ketoacidosis (increased ketones in your blood or urine).

    Who should not take pioglitazone tablets?

    See “What is the most important information I should know about pioglitazone tablets?”

    Do not take pioglitazone tablets if you:

    • have severe heart failure
    • are allergic to any of the ingredients in pioglitazone tablets. See the end of this Medication Guide for a complete list of ingredients in pioglitazone tablets

    Talk to your doctor before taking pioglitazone tablets if you have either of these conditions.

    What should I tell my doctor before taking pioglitazone tablets?

    Before you take pioglitazone tablets, tell your doctor if you:

    • have heart failure
    • have type 1 (“juvenile”) diabetes or had diabetic ketoacidosis
    • have a type of diabetic eye disease that causes swelling in the back of the eye (macular edema)
    • have liver problems
    • have or have had cancer of the bladder
    • are pregnant or plan to become pregnant. It is not known if pioglitazone tablets can harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant about the best way to control your blood glucose levels while pregnant
    • are a premenopausal woman (before the “change of life”) who does not have periods regularly or at all. Pioglitazone tablets may increase your chance of becoming pregnant. Talk to your doctor about birth control choices while taking pioglitazone tablets. Tell your doctor right away if you become pregnant while taking pioglitazone tablets
    • are breastfeeding or plan to breastfeed. It is not known if pioglitazone passes into your milk and if it can harm your baby. Talk to your doctor about the best way to control your blood glucose levels while breastfeeding

    Tell your doctor about all the medicines you take including prescription and over the counter medicines, vitamins, and herbal supplements.

    Pioglitazone tablets and some of your other medicines can affect each other. You may need to have your dose of pioglitazone tablets or certain other medicines changed.

    Know the medicines you take. Keep a list of your medicines and show it to your doctor and pharmacist before you start a new medicine. They will tell you if it is okay to take pioglitazone tablets with other medicines.

    How should I take pioglitazone tablets?

    • Take pioglitazone tablets exactly as your doctor tells you to take it
    • Your doctor may change your dose of pioglitazone tablets. Do not change your pioglitazone tablets dose unless your doctor tells you to
    • Pioglitazone tablets may be prescribed alone or with other diabetes medicines. This will depend on how well your blood sugar is controlled
    • Take pioglitazone tablets one time each day, with or without food
    • If you miss a dose of pioglitazone tablets, take your next dose as prescribed unless your doctor tells you differently. Do not take two doses at one time the next day
    • If you take too many pioglitazone tablets, call your doctor or go to the nearest hospital emergency room right away
    • If your body is under stress such as from a fever, infection, accident, or surgery the dose of your diabetes medicines may need to be changed. Call your doctor right away
    • Stay on your diet and exercise programs and test your blood sugar regularly while taking pioglitazone tablets
    • Your doctor should do certain blood tests before you start and while you take pioglitazone tablets
    • Your doctor should also do hemoglobin A1C testing to check how well your blood sugar is controlled with pioglitazone tablets
    • Your doctor should check your eyes regularly while you take pioglitazone tablets

    What are the possible side effects of pioglitazone tablets?

    Pioglitazone tablets may cause serious side effects including:

    • See “What is the most important information I should know about pioglitazone tablets?”
    • low blood sugar (hypoglycemia). This can happen if you skip meals, if you also use another medicine that lowers blood sugar, or if you have certain medical problems. Lightheadedness, dizziness, shakiness, or hunger may happen if your blood sugar is too low. Call your doctor if low blood sugar levels are a problem for you
    • liver problems. Call your doctor right away if you have:
    • nausea or vomiting
    • stomach pain
    • unusual or unexplained tiredness
    • loss of appetite
    • dark urine
    • yellowing of your skin or the whites of your eyes
    • bladder cancer. There may be an increased chance of having bladder cancer when you take pioglitazone tablets. You should not take pioglitazone tablets if you are receiving treatment for bladder cancer. Tell your doctor right away if you have any of the following symptoms of bladder cancer:
    • blood or a red color in your urine
    • an increased need to urinate
    • pain while you urinate
    • broken bones (fractures). Usually in the hand, upper arm, or foot in women. Talk to your doctor for advice on how to keep your bones healthy.
    • diabetic eye disease with swelling in the back of the eye (macular edema). Tell your doctor right away if you have any changes in your vision. Your doctor should check your eyes regularly
    • release of an egg from an ovary in a woman (ovulation) leading to pregnancy. Ovulation may happen when premenopausal women who do not have regular monthly periods take pioglitazone tablets. This can increase your chance of getting pregnant

    The most common side effects of pioglitazone tablets include:

    • cold-like symptoms (upper respiratory tract infection)
    • headache
    • sinus infection
    • muscle pain
    • sore throat

    Tell your doctor if you have any side effect that bothers you or that does not go away. These are not all the side effects of pioglitazone tablets. For more information, ask your doctor or pharmacist.

    Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

    How should I store pioglitazone tablets?

    • Store pioglitazone tablets at 68°F to 77°F (20°C to 25°C). Keep pioglitazone tablets in the original container and protect from light
    • Keep the pioglitazone tablets bottle tightly closed and keep tablets dry
    • Keep pioglitazone tablets and all medicines out of the reach of children

    General information about the safe and effective use of pioglitazone tablets

    Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use pioglitazone tablets for a condition for which it was not prescribed. Do not give pioglitazone tablets to other people, even if they have the same symptoms you have. It may harm them.

    This Medication Guide summarizes the most important information about pioglitazone tablets. If you would like more information, talk with your doctor. You can ask your doctor or pharmacist for information about pioglitazone tablets that is written for healthcare professionals. For more information, call Solco Healthcare LLC at 1-866-257-2597.

    What are the ingredients in pioglitazone tablets?

    Active Ingredient: pioglitazone, USP

    Inactive Ingredients: lactose monohydrate, hydroxypropyl cellulose, carboxymethylcellulose calcium, and magnesium stearate

    This Medication Guide has been approved by the U.S. Food and Drug Administration.

    Distributed by:

    Solco Healthcare US, LLC

    Cranbury, NJ 08512, USA

    Manufactured by:

    Zhejiang Huahai Pharmaceutical Co., Ltd.

    Xunqiao, Linhai, Zhejiang 317024, China

    Revised: 02/2018

    17749-02

  • Container Label - 15 mg - 90 tablets

    NDC: 43547-426-09 Rx only

    Pioglitazone Tablets, USP

    15 mg

    PHARMACIST: Dispense the accompanying Medication Guide to each patient.

    90 Tablets

    Each tablet contains pioglitazone hydrochloride USP, equivalent to 15 mg pioglitazone.

    Do not accept if seal over bottle opening is broken or missing.

    Keep this and all drugs out of the reach of children.

    Usual Dosage: See package insert.

    Store at 20 - 25°C (68 - 77°F); excursions permitted to 15 - 30°C (59 - 86°F) [see USP Controlled Room Temperature].

    Dispense in a tightly closed, light-resistant container.

    Protect from moisture and humidity.

    Manufactured by:
    Zhejiang Huahai Pharmaceutical Co., Ltd.
    Xunqiao, Linhai, Zhejiang 317024, China

    Distributed by:
    Solco Healthcare US, LLC
    Cranbury, NJ 08512, USA

    17740-01
    Rev.: 01/2018

    Pioglitazone Tablets, 15 mg - 90 tablets
  • Container Label - 30 mg - 90 tablets

    NDC: 43547-427-09 Rx only

    Pioglitazone Tablets, USP

    30 mg

    PHARMACIST: Dispense the accompanying Medication Guide to each patient.

    90 Tablets

    Each tablet contains pioglitazone hydrochloride USP, equivalent to 30 mg pioglitazone.

    Do not accept if seal over bottle opening is broken or missing.

    Keep this and all drugs out of the reach of children.

    Usual Dosage: See package insert.

    Store at 20 - 25°C (68 - 77°F); excursions permitted to 15 - 30°C (59 - 86°F) [see USP Controlled Room Temperature].

    Dispense in a tightly closed, light-resistant container.

    Protect from moisture and humidity.

    Manufactured by:
    Zhejiang Huahai Pharmaceutical Co., Ltd.
    Xunqiao, Linhai, Zhejiang 317024, China

    Distributed by:
    Solco Healthcare US, LLC
    Cranbury, NJ 08512, USA

    17743-01
    Rev.: 01/2018

    Pioglitazone Tablets, 30 mg - 90 tablets
  • Container Label - 45 mg - 90 tablets

    NDC: 43547-428-09 Rx only

    Pioglitazone Tablets, USP

    45 mg

    PHARMACIST: Dispense the accompanying Medication Guide to each patient.

    90 Tablets

    Each tablet contains pioglitazone hydrochloride USP, equivalent to 45 mg pioglitazone.

    Do not accept if seal over bottle opening is broken or missing.

    Keep this and all drugs out of the reach of children.

    Usual Dosage: See package insert.

    Store at 20 - 25°C (68 - 77°F); excursions permitted to 15 - 30°C (59 - 86°F) [see USP Controlled Room Temperature].

    Dispense in a tightly closed, light-resistant container.

    Protect from moisture and humidity.

    Manufactured by:
    Zhejiang Huahai Pharmaceutical Co., Ltd.
    Xunqiao, Linhai, Zhejiang 317024, China

    Distributed by:
    Solco Healthcare US, LLC
    Cranbury, NJ 08512, USA

    17746-01
    Rev.: 01/2018

    Pioglitazone Tablets, 45 mg - 90 tablets
  • INGREDIENTS AND APPEARANCE
    PIOGLITAZONE 
    pioglitazone tablet
    Product Information
    Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC: 43547-426
    Route of AdministrationORAL
    Active Ingredient/Active Moiety
    Ingredient NameBasis of StrengthStrength
    PIOGLITAZONE (UNII: X4OV71U42S) (PIOGLITAZONE - UNII:X4OV71U42S) PIOGLITAZONE15 mg
    Inactive Ingredients
    Ingredient NameStrength
    LACTOSE MONOHYDRATE (UNII: EWQ57Q8I5X)  
    HYDROXYPROPYL CELLULOSE (1600000 WAMW) (UNII: RFW2ET671P)  
    MAGNESIUM STEARATE (UNII: 70097M6I30)  
    CARBOXYMETHYLCELLULOSE CALCIUM (UNII: UTY7PDF93L)  
    Product Characteristics
    ColorWHITE (white to off-white) Scoreno score
    ShapeROUNDSize6mm
    FlavorImprint Code 295;S
    Contains    
    Packaging
    #Item CodePackage DescriptionMarketing Start DateMarketing End Date
    1NDC: 43547-426-0330 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    2NDC: 43547-426-0990 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    3NDC: 43547-426-50500 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    Marketing Information
    Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
    ANDAANDA20780605/20/2018
    PIOGLITAZONE 
    pioglitazone tablet
    Product Information
    Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC: 43547-427
    Route of AdministrationORAL
    Active Ingredient/Active Moiety
    Ingredient NameBasis of StrengthStrength
    PIOGLITAZONE (UNII: X4OV71U42S) (PIOGLITAZONE - UNII:X4OV71U42S) PIOGLITAZONE30 mg
    Inactive Ingredients
    Ingredient NameStrength
    LACTOSE MONOHYDRATE (UNII: EWQ57Q8I5X)  
    HYDROXYPROPYL CELLULOSE (1600000 WAMW) (UNII: RFW2ET671P)  
    MAGNESIUM STEARATE (UNII: 70097M6I30)  
    CARBOXYMETHYLCELLULOSE CALCIUM (UNII: UTY7PDF93L)  
    Product Characteristics
    ColorWHITE (white to off white) Scoreno score
    ShapeROUNDSize7mm
    FlavorImprint Code 293;S
    Contains    
    Packaging
    #Item CodePackage DescriptionMarketing Start DateMarketing End Date
    1NDC: 43547-427-0330 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    2NDC: 43547-427-0990 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    3NDC: 43547-427-50500 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    Marketing Information
    Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
    ANDAANDA20780605/20/2018
    PIOGLITAZONE 
    pioglitazone tablet
    Product Information
    Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC: 43547-428
    Route of AdministrationORAL
    Active Ingredient/Active Moiety
    Ingredient NameBasis of StrengthStrength
    PIOGLITAZONE (UNII: X4OV71U42S) (PIOGLITAZONE - UNII:X4OV71U42S) PIOGLITAZONE45 mg
    Inactive Ingredients
    Ingredient NameStrength
    LACTOSE MONOHYDRATE (UNII: EWQ57Q8I5X)  
    HYDROXYPROPYL CELLULOSE (1600000 WAMW) (UNII: RFW2ET671P)  
    MAGNESIUM STEARATE (UNII: 70097M6I30)  
    CARBOXYMETHYLCELLULOSE CALCIUM (UNII: UTY7PDF93L)  
    Product Characteristics
    ColorWHITE (white to off white) Scoreno score
    ShapeROUNDSize8mm
    FlavorImprint Code 294;S
    Contains    
    Packaging
    #Item CodePackage DescriptionMarketing Start DateMarketing End Date
    1NDC: 43547-428-0330 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    2NDC: 43547-428-0990 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    3NDC: 43547-428-50500 in 1 BOTTLE; Type 0: Not a Combination Product05/20/2018
    Marketing Information
    Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
    ANDAANDA20780605/20/2018
    Labeler - Solco Healthcare LLC (828343017)
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