Fluvastatin Sodium

• Take Fluvastatin sodium extended-release tablets orally once daily as a single dose, with or without food.
• Do not break, crush, or chew fluvastatin sodium extended-release tablets.
• Fluvastatin sodium extended-release tablets is only available as an 80 mg tablet. Fluvastatin sodium extended-release tablets cannot be titrated [see Dosage and Administration (2.2, 2.3].
• For patients that require a high-intensity statin or are unable to achieve their LDL-C goal receiving fluvastatin sodium extended-release tablet 80 mg daily, prescribe alternative LDL-C-lowering treatment.
• Assess LDL-C when clinically appropriate, as early as 4 weeks after initiating fluvastatin sodium extended-release tablets.

The recommended dosage for fluvastatin sodium extended-release tablets is 80 mg once daily.

Fluvastatin sodium extended-release tablets is not recommended for dosage initiation in pediatric patients because the recommended starting dosage cannot be achieved with the available strength of 80 mg. Recommend use of another fluvastatin product to initiate dosing in pediatric patients.

The recommended dosage of fluvastatin sodium extended-release tablets is 80 mg once daily in pediatric patients 10 years of age and older who require 80 mg of fluvastatin.

Fluvastatin sodium extended-release tablets may cause myopathy (muscle pain, tenderness, or weakness associated with elevated creatine kinase [CK]) and rhabdomyolysis. Acute kidney injury secondary to myoglobinuria and rare fatalities have occurred as a result of rhabdomyolysis with statins, including fluvastatin sodium extended-release tablets.

Myopathy, defined as muscle aching or muscle weakness in conjunction with increases in CK, values to greater than 10 times the upper limit of normal (ULN) was <0.1% in fluvastatin clinical trials [see Adverse Reactions (6.1)].

Risk Factors for Myopathy

Risk factors for myopathy include age 65 years or greater, uncontrolled hypothyroidism, renal impairment, and concomitant use with certain other drugs (including other lipid-lowering therapies) [see Drug Interactions (7.1)].

Steps to Prevent or Reduce the Risk of Myopathy and Rhabdomyolysis

Avoid concomitant use of fluvastatin sodium extended-release tablets with gemfibrozil, cyclosporin, and fluconazole. When used concomitantly with fluvastatin sodium extended-release tablets, lipid modifying doses (≥ 1 g/day) of niacin, fibrates, and colchicine may also increase the risk of myopathy and rhabdomyolysis
[see Drug Interactions (7.1)].

Discontinue fluvastatin sodium extended-release tablets if markedly elevated CK levels occur or if myopathy is either diagnosed or suspected. Muscle symptoms and CK increases may resolve if fluvastatin sodium
extended-release tablets are discontinued. Temporarily discontinue fluvastatin sodium extended-release tablets in patients experiencing an acute or serious condition at high risk of developing renal failure secondary to rhabdomyolysis, e.g., sepsis, shock, severe hypovolemia, major surgery, trauma, severe metabolic, endocrine, or electrolyte disorders, or uncontrolled epilepsy.

Inform patients of the risk of myopathy and rhabdomyolysis when starting fluvastatin sodium extended-release tablets. Instruct patients to promptly report any unexplained muscle pain, tenderness, or weakness, particularly if accompanied by malaise or fever.

There have been rare reports of immune-mediated necrotizing myopathy (IMNM), an autoimmune myopathy, associated with statin use, including reports of recurrence when the same or a different statin was administered. IMNM is characterized by proximal muscle weakness and elevated serum CK, which persist despite discontinuation of statin treatment; positive anti-HMG CoA reductase antibody, muscle biopsy showing necrotizing myopathy, and improvement with immunosuppressive agents. Additional neuromuscular and serologic testing may be necessary. Treatment with immunosuppressive agents may be required. Discontinue fluvastatin sodium extended-release tablets if IMNM is suspected.

Increases in serum transaminases have been reported with use of fluvastatin sodium extended-release tablets [see Adverse Reactions (6.1)]. In most cases, these changes appeared soon after initiation, were transient, were not accompanied by symptoms, and resolved or improved on continued therapy or after a brief interruption in therapy. Persistent increases to more than three times the ULN in serum transaminases have occurred in approximately 1.1% of patients receiving fluvastatin in clinical trials. Marked persistent increases of hepatic transaminases have also occurred with fluvastatin. There have been rare postmarketing reports of fatal and non-fatal hepatic failure in patients taking statins, including fluvastatin sodium extended-release tablets.

Patients who consume substantial quantities of alcohol and/or have a history of liver disease may be at increased risk for hepatic injury.

Consider liver enzyme testing before fluvastatin sodium extended-release tablets initiation and thereafter, when clinically indicated. Fluvastatin sodium extended-release tablets are contraindicated in patients with acute liver failure or decompensated cirrhosis [see Contraindications (4)]. If serious hepatic injury with clinical symptoms and/or hyperbilirubinemia or jaundice occurs, promptly discontinue fluvastatin sodium extended-release tablets.

Increases in HbA1c and fasting serum glucose levels have been reported with statins, including fluvastatin sodium extended-release tablets. Optimize lifestyle measures, including regular exercise, maintaining a healthy body weight, and making healthy food choices.

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.

In the fluvastatin capsule, clinical trials there were 2326 patients treated with fluvastatin (age range, 18 to 75 years, 44% women, 94% White, 4% Black or African American, 2% other ethnicities) with a median treatment duration of 24 weeks. The most common adverse reactions that led to treatment discontinuation and occurred at an incidence greater than placebo were: transaminase increased (0.8%), upper abdominal pain (0.3%), dyspepsia (0.3%), fatigue (0.2%), and diarrhea (0.2%).

In the fluvastatin sodium extended-release tablet clinical trials there were 912 patients treated with fluvastatin sodium extended-release tablets (age range, 21 to 87 years, 52% women, 91% White, 4% Black or African American, 5% other ethnicities) with a median treatment duration of 24 weeks. The most common adverse reactions that led to treatment discontinuation were abdominal pain (0.7%), diarrhea (0.5%), nausea (0.4%), dyspepsia (0.4%) and chest pain (0.3%).

Adverse reactions occurring in the fluvastatin capsules and fluvastatin sodium extended-release tablets controlled trials with a frequency ≥2% included the following:

In the Fluvastatin Capsules Intervention Prevention Study (LIPS), the effect of fluvastatin capsules 40 mg, administered twice daily on the risk of recurrent cardiac events was assessed in 1677 patients with coronary heart disease who had undergone a percutaneous coronary intervention. This was a multicenter, randomized, double-blind, placebo-controlled trial, patients were treated with dietary/lifestyle counseling and either fluvastatin capsules 40 mg (n=844) or placebo (n=833) given twice daily for a median of 3.9 years [see Clinical Studies (14.3)]. Table 2. Adverse Reactions Reported in ≥ 2% in Patients Treated with Fluvastatin Capsules/fluvastatin sodium extended-release tablets and at an Incidence Greater Than Placebo in the LIPS Trial.

Elevations in Liver Enzyme Tests

Approximately 1.1% of patients treated with fluvastatin capsules in clinical trials developed dose-related, persistent elevations of serum transaminase levels to more than 3 times the ULN. Fourteen of these patients (0.6%) were discontinued from therapy. In all clinical trials, a total of 33/2969 patients (1.1%) had persistent transaminase elevations with an average fluvastatin exposure of approximately 71.2 weeks; 19 of these patients (0.6%) were discontinued. The majority of patients with these abnormal biochemical findings were asymptomatic.

In a pooled analysis of all placebo-controlled studies in which fluvastatin capsules were used, persistent transaminase elevations (> 3 times the ULN on two consecutive weekly measurements) occurred in 0.2%, 1.5%, and 2.7% of patients treated with daily doses of 20, 40, and 80 mg (titrated to 40 mg twice daily) fluvastatin capsules, respectively. Ninety-one percent of the cases of persistent ALT/AST increased abnormalities (20 of 22 patients) occurred within 12 weeks of therapy and in all patients with persistent liver function test abnormalities there was an abnormal liver function test present at baseline or by Week 8.

In the pooled analysis of 24-week controlled trials, persistent transaminase elevation occurred in 1.9%, 1.8%, and 4.9% of patients treated with fluvastatin sodium extended-release tablets 80 mg, fluvastatin capsules 40 mg and fluvastatin capsules 40 mg twice daily, respectively. In 13 of 16 patients treated with fluvastatin sodium extended-release tablets the abnormality occurred within 12 weeks of initiation of treatment with fluvastatin sodium extended-release tablets 80 mg.

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

Musculoskeletal: Muscle cramps, myopathy, rhabdomyolysis, arthralgias, muscle spasms, muscle weakness, myositis. There have been rare reports of IMNM associated with statin use [see Warnings and Precautions (5.2)].

Neurological: Dysfunction of certain cranial nerves (including alteration of taste, impairment of extra-ocular movement, facial paresis), tremor, vertigo, paresthesia, hypoesthesia, dysesthesia, peripheral neuropathy, peripheral nerve palsy. There have been rare postmarketing reports of cognitive impairment (e.g., memory loss, forgetfulness, amnesia, memory impairment, confusion) associated with the use of all statins. The reports are generally nonserious, and reversible upon statin discontinuation, with variable times to symptom onset (1 day to years) and symptom resolution (median of 3 weeks). There have been rare reports of new-onset or exacerbation of myasthenia gravis, including ocular myasthenia, and reports of recurrence when the same or a different statin was administered.

Psychiatric: Anxiety, depression, psychic disturbances

Respiratory: Interstitial lung disease

Hypersensitivity reactions: An apparent hypersensitivity syndrome has been reported rarely which has included one or more of the following features: anaphylaxis, angioedema, lupus erythematosus-like syndrome, polymyalgia rheumatica, vasculitis, purpura, thrombocytopenia, leukopenia, hemolytic anemia, positive ANA, ESR (erythrocyte sedimentation rate) increase, eosinophilia, arthritis, arthralgia, urticaria, asthenia, photosensitivity reaction, fever, chills, flushing, malaise, dyspnea, toxic epidermal necrolysis, erythema multiforme, including Stevens-Johnson syndrome.

Gastrointestinal: Pancreatitis, hepatitis, including chronic active hepatitis, cholestatic jaundice, fatty change in liver, cirrhosis, fulminant hepatic necrosis, hepatoma, anorexia, vomiting, fatal and non-fatal hepatic failure.

Skin: Rash, dermatitis, including bullous dermatitis, eczema, alopecia, pruritus, lichen planus, a variety of skin changes (e.g., nodules, discoloration, dryness of skin/mucous membranes, changes to hair/nails).

Reproductive: Gynecomastia, loss of libido, erectile dysfunction.

Eye: Progression of cataracts (lens opacities), ophthalmoplegia.

Laboratory abnormalities: elevated transaminases, alkaline phosphatase, gamma-glutamyl transpeptidase and bilirubin; thyroid function abnormalities.

Table 3 includes a list of drugs that increase the risk of myopathy and rhabdomyolysis when used concomitantly with fluvastatin and instructions for preventing or managing them [see Warnings and Precautions (5.1), Clinical Pharmacology (12.3)].

Table 4 presents fluvastatin sodium extended-release tablets effect on other drugs and instructions for preventing or managing them.

Risk Summary

Discontinue fluvastatin sodium extended-release tablets when pregnancy is recognized. Alternatively, consider the ongoing therapeutic needs of the individual patient. Fluvastatin sodium extended-release tablets decreases synthesis of cholesterol and possibly other biologically active substances derived from cholesterol; therefore, fluvastatin sodium extended-release tablets may cause fetal harm when administered to pregnant patients based on the mechanism of action [see Clinical Pharmacology (12.1)]. In addition, treatment of hyperlipidemia is not generally necessary during pregnancy. Atherosclerosis is a chronic process and the discontinuation of lipid-lowering drugs during pregnancy should have little impact on the outcome of long-term therapy of primary hyperlipidemia for most patients.

Available data from case series and prospective and retrospective observational cohort studies over decades of use with statins in pregnant women have not identified a drug-associated risk of major congenital malformations. Published data from prospective and retrospective observational cohort studies with fluvastatin sodium extended-release tablets use in pregnant women are insufficient to determine if there is a drug-associated risk of miscarriage (see Data).

In animal reproduction studies, no adverse developmental effects were observed in pregnant rats or rabbits orally administered fluvastatin during the period of organogenesis at doses that resulted in 2 and 5 times, respectively, the human exposure at the maximum recommended human dosage of 40 mg/day, based on body surface area (mg/m²) (see Data).

The estimated background risk of major birth defects and 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% to 4% and 15% to 20%, respectively.

Data

Human Data

A Medicaid cohort linkage study of 1152 statin-exposed pregnant women compared to 886,996 controls did not find a significant teratogenic effect from maternal use of statins in the first trimester of pregnancy, after adjusting for potential confounders, including maternal age, diabetes mellitus, hypertension, obesity, and alcohol and tobacco use using propensity score-based methods. The relative risk of congenital malformations between the group with statin use and the group with no statin use in the first trimester was 1.07 (95% CI: 0.85 to 1.37) after controlling for confounders, particularly preexisting diabetes mellitus. There were also no statistically significant increases in any of the organ-specific malformations assessed after accounting for confounders. In the majority of pregnancies, statin treatment was initiated prior to pregnancy and was discontinued at some point in the first trimester when pregnancy was identified. Study limitations include reliance on physician coding to define the presence of a malformation, lack of control for certain confounders such as body mass index, use of prescription dispensing as verification for the use of a statin, and lack of information on non-live births.

Animal Data

Fluvastatin sodium given to rats during organogenesis at doses of 12 mg/kg/day and in rabbits at doses of 10 mg/kg/day produced delays in skeletal development. These doses resulted in 2 times (rat at 12 mg/kg) or 5 times (rabbit at 10 mg/kg) the 40 mg human exposure based on mg/m² surface area. Malaligned thoracic vertebrae were seen in rats at 36 mg/kg, a dose that produced significant maternal toxicity. A study in which female rats were given fluvastatin during the third trimester at 12 and 24 mg/kg/day resulted in maternal mortality at or near term and postpartum. In addition, fetal and neonatal lethality were apparent. No effects on the dam or fetus occurred at 2 mg/kg/day. A second study at levels of 2, 6, 12 and 24 mg/kg/day confirmed the findings in the first study with neonatal mortality beginning at 6 mg/kg. Rats were given fluvastatin from Gestation Day 15 to Lactation Day 21 at doses of 12 or 24 mg/kg/day with or without the presence of concurrent supplementation with mevalonic acid, a product of HMG-CoA reductase which is essential for cholesterol biosynthesis. The concurrent administration of mevalonic acid completely prevented the maternal and neonatal mortality but did not prevent low body weights in pups at 24 mg/kg on Days 0 and 7 postpartum.

Risk Summary

There is no information about the presence of fluvastatin in human milk, the effects of the drug on the breastfed infant or the effects of the drug on milk production. However, it has been shown that another drug in this class passes into human milk. Studies in rats have shown that fluvastatin and/or its metabolites are present in the milk of lactating rats. When a drug is present in animal milk, it is likely that the drug will be present in human milk (see Data). Statins, including fluvastatin sodium extended-release tablets, decrease cholesterol synthesis and possibly the synthesis of other biologically active substances derived from cholesterol and may cause harm to the breastfed infant.

Because of the potential for serious adverse reactions in a breastfed infant, based on the mechanism of action, advise patients that breastfeeding is not recommended during treatment with fluvastatin sodium extended-release tablets [see Use in Specific Populations (8.1), Clinical Pharmacology (12.1)].

Data

Following a single oral administration of 1 mg/kg of radioactive fluvastatin to lactating rats, the concentration of total radioactivity was determined. Fluvastatin and/or its metabolites were measured in the breast milk at a 2:1 ratio (milk:plasma).

The safety and effectiveness of fluvastatin sodium extended-release tablets as an adjunct to diet to reduce LDL-C have been established in pediatric patients 10 years of age and older with HeFH. Use of fluvastatin sodium extended-release tablets for this indication is based on open-label, uncontrolled clinical trials in 114 pediatric patients 9 years of age and older with HeFH. In these limited uncontrolled studies, there was no significant  effect on growth or sexual maturation in the males or females, or on menstrual cycle length in females.

The safety and effectiveness of fluvastatin sodium extended-release tablets have not been established in pediatric patients younger than 10 years of age with HeFH or in pediatric patients with other types of hyperlipidemia (other than HeFH).

Fluvastatin exposures were not significantly different between the nonelderly and elderly populations (age ≥65 years) [see Clinical Pharmacology (12.3)].

Advanced age (≥65 years) is a risk factor for fluvastatin sodium extended-release tablets-associated myopathy and rhabdomyolysis. Dose selection for an elderly patient should be cautious, recognizing the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy and the higher risk of myopathy. Monitor geriatric patients receiving fluvastatin sodium extended-release tablets for the increased risk of myopathy [see Warnings and Precautions (5.1)].

Renal impairment is a risk factor for myopathy and rhabdomyolysis. Dose adjustments for mild to moderate renal impairment are not necessary. Fluvastatin has not been studied at doses greater than 40 mg in patients with severe renal impairment; therefore, use fluvastatin sodium extended-release tablets with caution in patients with severe renal impairment. Monitor all patients with renal impairment for development of myopathy [see Warnings and Precautions (5.1), Clinical Pharmacology (12.3)].

Fluvastatin sodium extended-release tablets are contraindicated in patients with acute liver failure or decompensated cirrhosis [see Contraindications (4), Warnings and Precautions (5.3)].

Fluvastatin is a competitive inhibitor of HMG-CoA reductase, the rate limiting enzyme that converts 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) to mevalonate, a precursor of cholesterol.

Inhibition of HMG-CoA reductase by fluvastatin accelerates the expression of LDL-receptors, followed by the uptake of LDL-C from blood to the liver, leading to a decrease in plasma LDL-C and total cholesterol. Sustained inhibition of cholesterol synthesis in the liver also decreases levels of very-low-density lipoproteins. The maximum LDL-C reduction of fluvastatin sodium extended-release tablets is usually achieved by 4 weeks and is maintained after that.

Absorption

Fluvastatin administered as fluvastatin sodium extended-release tablets, 80 mg reaches peak concentration in approximately 3 hours under fasting conditions, after a low-fat meal, or 2.5 hours after a low-fat meal. The mean relative bioavailability of the extended-release tablet is approximately 29% (range, 9% to 66%) compared to that of the fluvastatin immediate-release capsule administered under fasting conditions. Administration of a high-fat meal delayed the absorption (T_max 6h) and increased the bioavailability of the extended-release tablet by approximately 50%. However, the maximum concentration of fluvastatin sodium extended-release tablets seen after a high-fat meal is less than the peak concentration following a single dose or twice daily dose of the 40 mg fluvastatin capsule.

Distribution

Fluvastatin is 98% bound to plasma proteins. The mean volume of distribution (VD_ss) is estimated at 0.35 L/kg. At therapeutic concentrations, the protein binding of fluvastatin is not affected by warfarin, salicylic acid and glyburide.

Elimination

Metabolism

Fluvastatin is metabolized in the liver, primarily via hydroxylation of the indole ring at the 5- and 6-positions. N-dealkylation and beta-oxidation of the side-chain also occurs. The hydroxy metabolites have some pharmacologic activity, but do not circulate in the blood. Fluvastatin has two enantiomers. Both enantiomers of fluvastatin are metabolized in a similar manner.

In vitro data indicate that fluvastatin metabolism involves multiple Cytochrome P450 (CYP) isozymes. CYP2C9 isoenzyme is primarily involved in the metabolism of fluvastatin (approximately 75%), while CYP2C8 and CYP3A4 isoenzymes are involved to a much less extent, i.e., approximately 5% and approximately 20%, respectively.

Excretion

Following oral administration, fluvastatin is primarily (about 90%) excreted in the feces as metabolites, with less than 2% present as unchanged drug. Approximately 5% of a radiolabeled oral dose were recovered in urine. The elimination half-life (t_1/2) of fluvastatin is approximately 3 hours.

Specific Populations

Geriatric Patients

Plasma levels of fluvastatin are not significantly different in patients age >65 years compared to patients age 21 to 49 years.

Gender

In a study evaluating the effect of age and gender on fluvastatin pharmacokinetics, there were no significant differences in fluvastatin exposures between males and females, except between younger females and younger males (both ages 21 to 49 years), where there was an approximate 30% increase in area under the curve (AUC) in females. Adjusting for body weight decreases the magnitude of the differences seen. For fluvastatin sodium extended-release tablets, the AUC increases 67% and 77% for women compared to men under fasted and high-fat meal fed conditions, respectively.

Pediatric Patients

Pharmacokinetic data in the pediatric population are not available.

Patients with Renal Impairment

In patients with moderate to severe renal impairment (CLCr 10 to 40 mL/min), AUC and C_max increased approximately 1.2-fold after administration of a single dose of 40 mg fluvastatin compared to healthy volunteers. In patients with end-stage renal disease on hemodialysis, the AUC increased by approximately 1.5-fold. Fluvastatin sodium extended-release tablets were not evaluated in patients with renal impairment [see Use in Specific Populations (8.6)]. However, systemic exposures after administration of fluvastatin sodium extended-release tablets are lower than after the 40 mg immediate release capsule.

Patients with Hepatic Impairment

In patients with hepatic impairment due to liver cirrhosis, fluvastatin AUC and C_max increased approximately 2.5-fold compared to healthy subjects after administration of a single 40 mg dose [see Use in Specific Populations (8.7)]. The enantiomer ratios of the two isomers of fluvastatin in hepatic impairment patients were comparable to those observed in healthy subjects.

Drug Interaction Studies

Data from drug-drug interactions studies involving coadministration of gemfibrozil, niacin, itraconazole, erythromycin, tolbutamide or clopidogrel indicate that the PK disposition of fluvastatin is not significantly altered when fluvastatin is coadministered with any of these drugs.

The below listed drug interaction information is derived from studies using fluvastatin capsules. Similar studies have not been conducted using the fluvastatin sodium extended-release tablet.

Data from drug-drug interaction studies involving fluvastatin and coadministration of either gemfibrozil, tolbutamide or losartan indicate that the PK disposition of either gemfibrozil, tolbutamide or losartan is not significantly altered when coadministered with fluvastatin.

In a 2-year carcinogenicity study in rats at doses of 6, 9, and 18 to 24 (escalated after 1 year) mg/kg/day, there was an increased incidence of thyroid follicular cell adenomas and carcinomas in males treated with 18 to 4 mg/kg/day. Additionally, a low incidence of forestomach squamous papillomas and one forestomach carcinoma were observed at the 18 to 24 mg/kg/day dose, likely due to prolonged direct contact exposure rather than a systemic effect. This dose represents a plasma AUC exposure approximately 26 to 35 times the mean human plasma drug concentration after a 40 mg oral dose.

A carcinogenicity study conducted in mice at doses of 0.3, 15 and 30 mg/kg/day revealed a statistically significant increase in forestomach squamous cell papillomas in females at 15 mg/kg/day and in males and females at 30 mg/kg/day. These doses represent plasma AUC exposures approximately 2 and 7 times the mean human plasma drug concentration after a 40 mg oral dose.

No evidence of mutagenicity was observed in vitro, with or without rat-liver metabolic activation, in the following studies: microbial mutagen tests using mutant strains of Salmonella typhimurium or Escherichia coli; malignant transformation assay in BALB/3T3 cells; unscheduled DNA synthesis in rat primary hepatocytes; chromosomal aberrations in V79 Chinese Hamster cells; HGPRT V79 Chinese Hamster cells. In addition, there was no evidence of genotoxicity in vivo in either a rat chromosome aberration study or mouse micronucleus test.

In a fertility study in rats with daily doses up to 6 mg/kg/day for females and 20 mg/kg/day for males, fluvastatin sodium had no adverse effects on the fertility or reproductive performance.

Hamsters treated for 3 months at 20 mg/kg/day (approximately three times the 40 mg human daily dose based on body surface area, mg/m²) showed small seminal vesicles and testes, along with tubular degeneration and aspermatogenesis in the testes and vesiculitis in the seminal vesicles. Rats treated for 2 years at 18 mg/kg/day (approximately four times human exposure based on body surface area) exhibited vesiculitis in the seminal vesicles and edema in the testes.