Complete SPL Sections#
WARNING: LACTIC ACIDOSIS
BOXED WARNING SECTION
Postmarketing cases of metformin-associated lactic acidosis have resulted in death, hypothermia, hypotension, and resistant bradyarrhythmias. The onset of metformin-associated lactic acidosis is often subtle, accompanied only by nonspecific symptoms such as malaise, myalgias, respiratory distress, somnolence, and abdominal pain. Metformin-associated lactic acidosis was characterized by elevated blood lactate levels (> 5 mmol/Liter), anion gap acidosis (without evidence of ketonuria or ketonemia), an increased lactate/pyruvate ratio; and metformin plasma levels generally > 5 mcg/mL [see Warnings and Precautions (5.1) ] . Risk factors for metformin-associated lactic acidosis include renal impairment, concomitant use of certain drugs (e.g., carbonic anhydrase inhibitors such as topiramate), age 65 years old or greater, having a radiological study with contrast, surgery and other procedures, hypoxic states (e.g., acute congestive heart failure), excessive alcohol intake, and hepatic impairment. Steps to reduce the risk of and manage metformin-associated lactic acidosis in these high risk groups are provided [see Dosage and Administration (2.3) , Contraindications (4) , Warnings and Precautions (5.1) ] . If metformin-associated lactic acidosis is suspected, immediately discontinue metformin hydrochloride extended-release tablets and institute general supportive measures in a hospital setting. Prompt hemodialysis is recommended [see Warnings and Precautions (5.1) ] .
1 INDICATIONS AND USAGE
INDICATIONS & USAGE SECTION
Metformin hydrochloride extended-release tablets are indicated as an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus.
2 DOSAGE AND ADMINISTRATION
DOSAGE & ADMINISTRATION SECTION
3 DOSAGE FORMS AND STRENGTHS
DOSAGE FORMS & STRENGTHS SECTION
Metformin Hydrochloride Extended-release Tablets USP, 500 mg are white, capsule shaped, biconvex tablets debossed "IP 178" on one side and plain on the other side. Metformin Hydrochloride Extended-release Tablets USP, 750 mg are white, capsule shaped, biconvex tablets debossed "IP 179" on one side and plain on the other side.
4 CONTRAINDICATIONS
CONTRAINDICATIONS SECTION
Metformin hydrochloride extended-release tablets are contraindicated in patients with: Severe renal impairment (eGFR below 30 mL/min/1.73 m 2 ) [see Warnings and Precautions (5.1) ] . Hypersensitivity to metformin. Acute or chronic metabolic acidosis, including diabetic ketoacidosis, with or without coma.
5 WARNINGS AND PRECAUTIONS
WARNINGS AND PRECAUTIONS SECTION
6 ADVERSE REACTIONS
ADVERSE REACTIONS SECTION
The following adverse reactions are also discussed elsewhere in the labeling: Lactic Acidosis [see Boxed Warning and Warnings and Precautions (5.1) ] Vitamin B 12 Deficiency [see Warnings and Precautions (5.2) ] Hypoglycemia [see Warnings and Precautions (5.3) ]
7 DRUG INTERACTIONS
DRUG INTERACTIONS SECTION
Table 3 presents clinically significant drug interactions with metformin hydrochloride extended-release tablets. Table 3: Clinically Significant Drug Interactions with Metformin Hydrochloride Extended-Release Tablets Carbonic Anhydrase Inhibitors Clinical Impact: Carbonic anhydrase inhibitors frequently cause a decrease in serum bicarbonate and induce non-anion gap, hyperchloremic metabolic acidosis. Concomitant use of these drugs with metformin hydrochloride extended-release tablets may increase the risk for lactic acidosis. Intervention: Consider more frequent monitoring of these patients. Examples: Topiramate, zonisamide, acetazolamide or dichlorphenamide. Drugs that Reduce Metformin Hydrochloride Extended-Release Tablets Clearance Clinical Impact: Concomitant use of drugs that interfere with common renal tubular transport systems involved in the renal elimination of metformin (e.g., organic cationic transporter-2 [OCT2] / multidrug and toxin extrusion [MATE] inhibitors) could increase systemic exposure to metformin and may increase the risk for lactic acidosis [see Clinical Pharmacology (12.3) ]. Intervention: Consider the benefits and risks of concomitant use with metformin hydrochloride extended-release tablets. Examples: Ranolazine, vandetanib, dolutegravir, and cimetidine. Alcohol Clinical Impact: Alcohol is known to potentiate the effect of metformin on lactate metabolism. Intervention: Warn patients against excessive alcohol intake while receiving metformin hydrochloride extended-release tablets. Insulin Secretagogues or Insulin Clinical Impact: Co-administration of metformin hydrochloride extended-release tablets with an insulin secretagogue (e.g., sulfonylurea) or insulin may increase the risk of hypoglycemia. Intervention: Patients receiving an insulin secretagogue or insulin may require lower doses of the insulin secretagogue or insulin. Drugs Affecting Glycemic Control Clinical Impact: Certain drugs tend to produce hyperglycemia and may lead to loss of glycemic control. Intervention: When such drugs are administered to a patient receiving metformin hydrochloride extended-release tablets, observe the patient closely for loss of blood glucose control. When such drugs are withdrawn from a patient receiving metformin hydrochloride extended-release tablets, observe the patient closely for hypoglycemia. Examples: Thiazides and other diuretics, corticosteroids, phenothiazines, thyroid products, estrogens, oral contraceptives, phenytoin, nicotinic acid, sympathomimetics, calcium channel blockers, and isoniazid.
8 USE IN SPECIFIC POPULATIONS
USE IN SPECIFIC POPULATIONS SECTION
10 OVERDOSAGE
OVERDOSAGE SECTION
Overdose of metformin hydrochloride has occurred, including ingestion of amounts greater than 50 grams. Hypoglycemia was reported in approximately 10% of cases, but no causal association with metformin has been established. Lactic acidosis has been reported in approximately 32% of metformin overdose cases [see Warnings and Precautions (5.1) ] . Metformin is dialyzable with a clearance of up to 170 mL/min under good hemodynamic conditions. Therefore, hemodialysis may be useful for removal of accumulated drug from patients in whom metformin overdosage is suspected.
11 DESCRIPTION
DESCRIPTION SECTION
Metformin hydrochloride extended-release tablets, USP contain the antihyperglycemic agent metformin, which is a biguanide, in the form of monohydrochloride. The chemical name of metformin hydrochloride is N,N -dimethylimidodicarbonimidic diamide hydrochloride. The structural formula is as shown below: Metformin hydrochloride extended-release tablets, USP is a white to off-white crystalline compound with a molecular formula of C 4 H 11 N 5 • HCl and a molecular weight of 165.63. Metformin hydrochloride extended-release tablets, USP is freely soluble in water and is practically insoluble in acetone, ether, and chloroform. The pK a of metformin is 12.4. The pH of a 1% aqueous solution of metformin hydrochloride extended-release tablets, USP is 6.68. Metformin hydrochloride extended-release tablets, USP contain 500 mg or 750 mg of metformin hydrochloride, USP as active ingredient. Metformin hydrochloride extended-release tablets, USP 500 mg and 750 mg contain the inactive ingredients: colloidal silicon dioxide, hypromellose, magnesium stearate, povidone, sodium carbonate anhydrous, talc and xanthan gum. USP Dissolution Test pending. System Components and Performance - Metformin hydrochloride extended-release tablets, comprise a dual hydrophilic polymer matrix system. Metformin hydrochloride is combined with a drug release controlling polymer to form an "inner" phase, which is then incorporated as discrete particles into an "external" phase of a second polymer. After administration, fluid from the gastrointestinal (GI) tract enters the tablet, causing the polymers to hydrate and swell. Drug is released slowly from the dosage form by a process of diffusion through the gel matrix that is essentially independent of pH. The hydrated polymer system is not rigid and is expected to be broken up by normal peristalsis in the GI tract. The biologically inert components of the tablet may occasionally remain intact during GI transit and will be eliminated in the feces as a soft, hydrated mass.
12 CLINICAL PHARMACOLOGY
CLINICAL PHARMACOLOGY SECTION
13 NONCLINICAL TOXICOLOGY
NONCLINICAL TOXICOLOGY SECTION
14 CLINICAL STUDIES
CLINICAL STUDIES SECTION
16 HOW SUPPLIED/STORAGE AND HANDLING
HOW SUPPLIED SECTION
17 PATIENT COUNSELING INFORMATION
INFORMATION FOR PATIENTS SECTION
Advise the patient to read the FDA-approved patient labeling (Patient Information). Lactic Acidosis: Explain the risks of lactic acidosis, its symptoms, and conditions that predispose to its development. Advise patients to discontinue metformin hydrochloride extended-release tablets immediately and to promptly notify their healthcare provider if unexplained hyperventilation, myalgias, malaise, unusual somnolence or other nonspecific symptoms occur. Counsel patients against excessive alcohol intake and inform patients about importance of regular testing of renal function while receiving metformin hydrochloride extended-release tablets. Instruct patients to inform their doctor that they are taking metformin hydrochloride extended-release tablets prior to any surgical or radiological procedure, as temporary discontinuation may be required [see Warnings and Precautions (5.1) ]. Hypoglycemia Inform patients that hypoglycemia may occur when metformin hydrochloride extended-release tablets are co-administered with oral sulfonylureas and insulin. Explain to patients receiving concomitant therapy the risks of hypoglycemia, its symptoms and treatment, and conditions that predispose to its development [see Warnings and Precautions (5.3) ]. Vitamin B 12 Deficiency: Inform patients about importance of regular hematological parameters while receiving metformin hydrochloride extended-release tablets [see Warnings and Precautions (5.2) ] . Females of Reproductive Age: Inform females that treatment with metformin hydrochloride extended-release tablets may result in ovulation in some premenopausal anovulatory women which may lead to unintended pregnancy [see Use in Specific Populations (8.3)]. Metformin Hydrochloride Extended-Release Tablets Administration Information: Inform patients that metformin hydrochloride extended-release tablets must be swallowed whole and not crushed, cut, or chewed, and that the inactive ingredients may occasionally be eliminated in the feces as a soft mass that may resemble the original tablet. Manufactured for: AvKARE Pulaski, TN 38478 Manufactured by: Amneal Pharmaceuticals of New York, LLC Brookhaven, NY 11719 Mfg. Rev. 03-2021-04 AV 09/21
PATIENT INFORMATION
SPL UNCLASSIFIED SECTION
Metformin Hydrochloride (met for’ min hye” droe klor’ ide) Extended-Release Tablets Read the Patient Information that comes with metformin hydrochloride extended-release tablets before you start taking it and each time you get a refill. There may be new information. This leaflet does not take the place of talking with your healthcare provider about your medical condition or treatment. What is the most important information I should know about metformin hydrochloride extended-release tablets? Serious side effects can happen in people taking metformin hydrochloride extended-release tablets, including: Lactic Acidosis: Metformin hydrochloride, the medicine in metformin hydrochloride extended-release tablets, can cause a rare, but serious, side effect called lactic acidosis (a build-up of lactic acid in the blood) that can cause death. Lactic acidosis is a medical emergency and must be treated in a hospital. Stop taking metformin hydrochloride extended-release tablets and call your healthcare provider right away if you get any of the following symptoms of lactic acidosis: feel very weak and tired have unusual (not normal) muscle pain have trouble breathing have unusual sleepiness or sleep longer than usual have unexplained stomach or intestinal problems with nausea and vomiting, or diarrhea feel cold, especially in your arms and legs feel dizzy or lightheaded have a slow or irregular heartbeat You have a higher chance of getting lactic acidosis if you: have kidney problems. People whose kidneys are not working properly should not take metformin hydrochloride extended-release tablets. have liver problems. have congestive heart failure that requires treatment with medicines. drink a lot of alcohol (very often or short-term “binge” drinking). get dehydrated (lose a large amount of body fluids). This can happen if you are sick with a fever, vomiting, or diarrhea. Dehydration can also happen when you sweat a lot with activity or exercise and do not drink enough fluids. have certain x-ray tests with injectable dyes or contrast agents. have surgery. have a heart attack, severe infection, or stroke. are 80 years of age or older and have not had your kidney function tested. What are metformin hydrochloride extended-release tablets? Metformin hydrochloride extended-release tablets are prescription medicines that contain metformin hydrochloride. Metformin hydrochloride extended-release tablets are used with diet and exercise to help control high blood sugar (hyperglycemia) in adults with type 2 diabetes. Metformin hydrochloride extended-release tablets are not for people with type 1 diabetes. Metformin hydrochloride extended-release tablets are not for people with diabetic ketoacidosis (increased ketones in your blood or urine). Metformin hydrochloride extended-release tablet works longer in your body. This medicine helps control your blood sugar in a number of ways. These include helping your body respond better to the insulin it makes naturally, decreasing the amount of sugar your liver makes, and decreasing the amount of sugar your intestines absorb. Metformin hydrochloride extended-release tablets do not cause your body to make more insulin. Who should not take metformin hydrochloride extended-release tablets? Some conditions increase your chance of getting lactic acidosis, or cause other problems if you take this medicine. Most of the conditions listed below can increase your chance of getting lactic acidosis. Do not take metformin hydrochloride extended-release tablets if you: have kidney problems are allergic to the metformin hydrochloride in metformin hydrochloride extended-release tablets or any of the ingredients in metformin hydrochloride extended-release tablets. See the end of this leaflet for a complete list of ingredients in metformin hydrochloride extended-release tablets. are going to get an injection of dye or contrast agents for an x-ray procedure or if you are going to have surgery and not able to eat or drink much. In these situations, metformin hydrochloride extended-release tablets will need to be stopped for a short time. Talk to your healthcare provider about when you should stop metformin hydrochloride extended-release tablets and when you should start metformin hydrochloride extended-release tablets again. See “ What is the most important information I should know about metformin hydrochloride extended-release tablets? ” What should I tell my healthcare provider before taking metformin hydrochloride extended-release tablets? Before taking metformin hydrochloride extended-release tablets, tell your healthcare provider if you: have type 1 diabetes. Metformin hydrochloride extended-release tablets should not be used to treat people with type 1 diabetes. have a history or risk for diabetic ketoacidosis (high levels of certain acids, known as ketones, in the blood or urine). Metformin hydrochloride extended-release tablets should not be used for the treatment of diabetic ketoacidosis. have kidney problems. have liver problems. have heart problems, including congestive heart failure. are older than 80 years. If you are over 80 years old you should not take metformin hydrochloride extended-release tablets unless your kidneys have been checked and they are normal. drink alcohol very often, or drink a lot of alcohol in short-term “binge” drinking. are taking insulin. have any other medical conditions. are pregnant or plan to become pregnant. It is not known if metformin hydrochloride extended-release tablets will harm your unborn baby. If you are pregnant, talk with your healthcare provider about the best way to control your blood sugar while you are pregnant. are breast-feeding or plan to breast-feed. It is not known if metformin hydrochloride passes into your breast milk. Talk with your healthcare provider about the best way to feed your baby while you take metformin hydrochloride extended-release tablets. Tell your healthcare provider about all the medicines you take, including prescription and nonprescription medicines, vitamins, and herbal supplements. Know the medicines you take. Keep a list of them to show your healthcare provider and pharmacist when you get a new medicine. Metformin hydrochloride extended-release tablets may affect the way other medicines work, and other medicines may affect how metformin hydrochloride extended-release tablet works. Can metformin hydrochloride extended-release tablets be used in children? Metformin hydrochloride extended-release tablets have not been studied in children. How should I take metformin hydrochloride extended-release tablets? Take metformin hydrochloride extended-release tablets exactly as your healthcare provider tells you. Metformin hydrochloride extended-release tablets should be taken with meals to help lessen an upset stomach side effect. Swallow metformin hydrochloride extended-release tablets whole. Do not crush, cut, or chew metformin hydrochloride extended-release tablets. You may sometimes pass a soft mass in your stools (bowel movement) that looks like metformin hydrochloride extended-release tablets. This is not harmful and will not affect the way metformin hydrochloride extended-release tablets works to control your diabetes. When your body is under some types of stress, such as fever, trauma (such as a car accident), infection, or surgery, the amount of diabetes medicine that you need may change. Tell your healthcare provider right away if you have any of these problems. Your healthcare provider should do blood tests to check how well your kidneys are working before and during your treatment with metformin hydrochloride extended-release tablets. Your healthcare provider will check your diabetes with regular blood tests, including your blood sugar levels and your hemoglobin A1C. Follow your healthcare provider’s instructions for treating blood sugar that is too low (hypoglycemia). Talk to your healthcare provider if low blood sugar is a problem for you. See “ What are the poss...
Repackaging Information
SPL UNCLASSIFIED SECTION
Please reference the How Supplied section listed above for a description of individual tablets. This drug product has been received by Aphena Pharma - TN in a manufacturer or distributor packaged configuration and repackaged in full compliance with all applicable cGMP regulations. The package configurations available from Aphena are listed below: Count 500 mg 30 71610-652-30 60 71610-652-53 90 71610-652-60 120 71610-652-70 180 71610-652-80 360 71610-652-94 Store between 20°-25°C (68°-77°F). See USP Controlled Room Temperature. Dispense in a tight light-resistant container as defined by USP. Keep this and all drugs out of the reach of children. Repackaged by: Cookeville, TN 38506 20220715JK
PRINCIPAL DISPLAY PANEL - 500 mg
PACKAGE LABEL.PRINCIPAL DISPLAY PANEL
NDC 71610-652 - Metformin HCl ER, USP 500 mg Tablets - Rx Only
