Therapy with lipid-altering agents should be only one component of multiple risk factor intervention in individuals at significantly increased risk for atherosclerotic vascular disease due to hypercholesterolemia. Drug therapy is indicated as an adjunct to diet when the response to a diet restricted in saturated fat and cholesterol and other nonpharmacologic measures alone has been inadequate.
1.1 Prevention of Cardiovascular Disease
In hypercholesterolemic patients without clinically evident coronary heart disease (CHD), Pravastatin sodium tablets are indicated to:
• reduce the risk of myocardial infarction (MI).
• reduce the risk of undergoing myocardial revascularization procedures.
• reduce the risk of cardiovascular mortality with no increase in death from non-cardiovascular causes.
1.2 Hyperlipidemia
Pravastatin sodium tablets are indicated:
• as an adjunct to diet to reduce elevated total cholesterol (Total-C), low-density lipoprotein cholesterol (LDL-C), apolipoprotein B (ApoB), and triglyceride (TG) levels and to increase high-density lipoprotein cholesterol (HDL-C) in patients with primary hypercholesterolemia and mixed dyslipidemia (Fredrickson Types IIa and IIb).1
• as an adjunct to diet for the treatment of patients with elevated serum TG levels (Fredrickson Type IV).
• for the treatment of patients with primary dysbetalipoproteinemia (Fredrickson Type III) who do not respond adequately to diet.
• as an adjunct to diet and lifestyle modification for treatment of heterozygous familial hypercholesterolemia (HeFH) in children and adolescent patients ages 8 years and older if after an adequate trial of diet the following findings are present:
a. LDL-C remains ≥ 190 mg/dL or
b. LDL-C remains ≥ 160 mg/dL and:
• there is a positive family history of premature cardiovascular disease (CVD) or
• two or more other CVD risk factors are present in the patient.
1.3 Limitations of Use
Pravastatin sodium tablets have not been studied in conditions where the major lipoprotein abnormality is elevation of chylomicrons (Fredrickson Types I and V).
Pravastatin Dosage and Administration
2.1 General Dosing Information
The patient should be placed on a standard cholesterol-lowering diet before receiving Pravastatin sodium tablets USP and should continue on this diet during treatment with Pravastatin sodium tablets USP [see NCEP Treatment Guidelines for details on dietary therapy].
2.2 Adult Patients
The recommended starting dose is 40 mg once daily. If a daily dose of 40 mg does not achieve desired cholesterol levels, 80 mg once daily is recommended. In patients with significant renal impairment, a starting dose of 10 mg daily is recommended. Pravastatin sodium tablets USP can be administered orally as a single dose at any time of the day, with or without food. Since the maximal effect of a given dose is seen within 4 weeks, periodic lipid determinations should be performed at this time and dosage adjusted according to the patient’s response to therapy and established treatment guidelines.
2.3 Pediatric Patients
Children (Ages 8 to 13 Years, Inclusive)
The recommended dose is 20 mg once daily in children 8 to 13 years of age. Doses greater than 20 mg have not been studied in this patient population.
Adolescents (Ages 14 to 18 Years)
The recommended starting dose is 40 mg once daily in adolescents 14 to 18 years of age. Doses greater than 40 mg have not been studied in this patient population.
Children and adolescents treated with Pravastatin should be reevaluated in adulthood and appropriate changes made to their cholesterol-lowering regimen to achieve adult goals for LDL-C [see Indications and Usage (1.2)].
2.4 Concomitant Lipid-Altering Therapy
Pravastatin sodium tablets USP may be used with bile acid resins. When administering a bile-acid-binding resin (e.g., cholestyramine, colestipol) and Pravastatin, Pravastatin sodium tablets USP should be given either 1 hour or more before or at least 4 hours following the resin [see Clinical Pharmacology (12.3)].
The combination of statins and fibrates should generally be used with caution [see Warnings and Precautions (5.1)].
2.5 Dosage in Patients Taking Cyclosporine
In patients taking immunosuppressive drugs such as cyclosporine concomitantly with Pravastatin, therapy should begin with 10 mg of Pravastatin sodium once-a-day at bedtime and titration to higher doses should be done with caution. Most patients treated with this combination received a maximum Pravastatin sodium dose of 20 mg/day. In patients taking cyclosporine, therapy should be limited to 20 mg of Pravastatin sodium once daily [see Warnings and Precautions (5.1) and Drug Interactions (7.1)].
2.6 Dosage in Patients Taking Clarithromycin
In patients taking clarithromycin, therapy should be limited to 40 mg of Pravastatin sodium once daily [see Drug Interactions (7.2)].
Dosage Forms and Strengths
Pravastatin sodium tablets USP are supplied as:
10 mg tablets: Pink, unscored, round tablet, debossed “TEVA” on one side and “771” on the other side.
20 mg tablets: Light-yellow, unscored, round tablet, debossed “TEVA” on one side and “7201” on the other side.
40 mg tablets: Light-green, unscored, round tablet, debossed “TEVA” on one side and “7202” on the other side.
Contraindications
4.1 Hypersensitivity
Hypersensitivity to any component of this medication.
4.2 Liver
Active liver disease or unexplained, persistent elevations of serum transaminases [see Warnings and Precautions (5.2)].
4.3 Pregnancy
Atherosclerosis is a chronic process and discontinuation of lipid-lowering drugs during pregnancy should have little impact on the outcome of long-term therapy of primary hypercholesterolemia. Cholesterol and other products of cholesterol biosynthesis are essential components for fetal development (including synthesis of steroids and cell membranes). Since statins decrease cholesterol synthesis and possibly the synthesis of other biologically active substances derived from cholesterol, they are contraindicated during pregnancy and in nursing mothers. Pravastatin SHOULD BE ADMINISTERED TO WOMEN OF CHILDBEARING AGE ONLY WHEN SUCH PATIENTS ARE HIGHLY UNLIKELY TO CONCEIVE AND HAVE BEEN INFORMED OF THE POTENTIAL HAZARDS. If the patient becomes pregnant while taking this class of drug, therapy should be discontinued immediately and the patient apprised of the potential hazard to the fetus [see Use in Specific Populations (8.1)].
4.4 Nursing Mothers
A small amount of Pravastatin is excreted in human breast milk. Because statins have the potential for serious adverse reactions in nursing infants, women who require Pravastatin sodium tablet treatment should not breast-feed their infants [see Use in Specific Populations (8.3)].
Warnings and Precautions
5.1 Skeletal Muscle
Rare cases of rhabdomyolysis with acute renal failure secondary to myoglobinuria have been reported with Pravastatin and other drugs in this class. A history of renal impairment may be a risk factor for the development of rhabdomyolysis. Such patients merit closer monitoring for skeletal muscle effects.
Uncomplicated myalgia has also been reported in Pravastatin-treated patients [see Adverse Reactions (6)]. Myopathy, defined as muscle aching or muscle weakness in conjunction with increases in creatine phosphokinase (CPK) values to greater than 10 times the upper limit of normal (ULN), was rare (< 0.1%) in Pravastatin clinical trials. Myopathy should be considered in any patient with diffuse myalgias, muscle tenderness or weakness, and/or marked elevation of CPK. Predisposing factors include advanced age (> 65), uncontrolled hypothyroidism, and renal impairment. Patients should be advised to report promptly unexplained muscle pain, tenderness, or weakness, particularly if accompanied by malaise or fever. Pravastatin therapy should be discontinued if markedly elevated CPK levels occur or myopathy is diagnosed or suspected. Pravastatin therapy should also be temporarily withheld in any patient experiencing an acute or serious condition predisposing to the development of renal failure secondary to rhabdomyolysis, e.g., sepsis; hypotension; major surgery; trauma; severe metabolic, endocrine, or electrolyte disorders; or uncontrolled epilepsy.
The risk of myopathy during treatment with statins is increased with concurrent therapy with either erythromycin, cyclosporine, niacin, or fibrates. However, neither myopathy nor significant increases in CPK levels have been observed in 3 reports involving a total of 100 post-transplant patients (24 renal and 76 cardiac) treated for up to 2 years concurrently with Pravastatin 10 to 40 mg and cyclosporine. Some of these patients also received other concomitant immunosuppressive therapies. Further, in clinical trials involving small numbers of patients who were treated concurrently with Pravastatin and niacin, there were no reports of myopathy. Also, myopathy was not reported in a trial of combination Pravastatin (40 mg/day) and gemfibrozil (1200 mg/day), although 4 of 75 patients on the combination showed marked CPK elevations versus 1 of 73 patients receiving placebo. There was a trend toward more frequent CPK elevations and patient withdrawals due to musculoskeletal symptoms in the group receiving combined treatment as compared with the groups receiving placebo, gemfibrozil, or Pravastatin monotherapy. The use of fibrates alone may occasionally be associated with myopathy. The benefit of further alterations in lipid levels by the combined use of Pravastatin sodium with fibrates should be carefully weighed against the potential risks of this combination.
5.2 Liver
Statins, like some other lipid-lowering therapies, have been associated with biochemical abnormalities of liver function. In 3 long-term (4.8 to 5.9 years), placebo-controlled clinical trials, 19,592 subjects (19,768 randomized) were exposed to Pravastatin or placebo [see Clinical Studies (14)]. In an analysis of serum transaminase values (ALT, AST), incidences of marked abnormalities were compared between the Pravastatin and placebo treatment groups; a marked abnormality was defined as a post-treatment test value greater than 3 times the upper limit of normal for subjects with pretreatment values less than or equal to the upper limit of normal, or 4 times the pretreatment value for subjects with pretreatment values greater than the upper limit of normal but less than 1.5 times the upper limit of normal. Marked abnormalities of ALT or AST occurred with similar low frequency (≤ 1.2%) in both treatment groups. Overall, clinical trial experience showed that liver function test abnormalities observed during Pravastatin therapy were usually asymptomatic, not associated with cholestasis, and did not appear to be related to treatment duration. In a 320 patient placebo-controlled clinical trial, subjects with chronic (> 6 months) stable liver disease, due primarily to hepatitis C or non-alcoholic fatty liver disease, were treated with 80 mg Pravastatin or placebo for up to 9 months. The primary safety endpoint was the proportion of subjects with at least one ALT ≥ 2 times the upper limit of normal for those with normal ALT (≤ the upper limit of normal) at baseline or a doubling of the baseline ALT for those with elevated ALT (> the upper limit of normal) at baseline. By Week 36, 12 out of 160 (7.5%) subjects treated with Pravastatin met the prespecified safety ALT endpoint compared to 20 out of 160 (12.5%) subjects receiving placebo. Conclusions regarding liver safety are limited since the study was not large enough to establish similarity between groups (with 95% confidence) in the rates of ALT elevation.
It is recommended that liver function tests be performed prior to the initiation of therapy and when clinically indicated.
Active liver disease or unexplained persistent transaminase elevations are contraindications to the use of Pravastatin [see Contraindications (4.2)]. Caution should be exercised when Pravastatin is administered to patients who have a recent (< 6 months) history of liver disease, have signs that may suggest liver disease (e.g., unexplained aminotransferase elevations, jaundice), or are heavy users of alcohol.
Patients who develop increased transaminase levels or signs and symptoms of active liver disease while taking Pravastatin should be evaluated with a second liver function evaluation to confirm the finding and be followed thereafter with frequent liver function tests until the abnormality(ies) returns to normal. Should an increase in AST or ALT of 3 times the upper limit of normal or greater persist, withdrawal of Pravastatin therapy is recommended.
5.3 Endocrine Function
Statins interfere with cholesterol synthesis and lower circulating cholesterol levels and, as such, might theoretically blunt adrenal or gonadal steroid hormone production. Results of clinical trials with Pravastatin in males and post-menopausal females were inconsistent with regard to possible effects of the drug on basal steroid hormone levels. In a study of 21 males, the mean testosterone response to human chorionic gonadotropin was significantly reduced (p < 0.004) after 16 weeks of treatment with 40 mg of Pravastatin. However, the percentage of patients showing a ≥ 50% rise in plasma testosterone after human chorionic gonadotropin stimulation did not change significantly after therapy in these patients. The effects of statins on spermatogenesis and fertility have not been studied in adequate numbers of patients. The effects, if any, of Pravastatin on the pituitary-gonadal axis in pre-menopausal females are unknown. Patients treated with Pravastatin who display clinical evidence of endocrine dysfunction should be evaluated appropriately. Caution should also be exercised if a statin or other agent used to lower cholesterol levels is administered to patients also receiving other drugs (e.g., ketoconazole, spironolactone, cimetidine) that may diminish the levels or activity of steroid hormones.
In a placebo-controlled study of 214 pediatric patients with HeFH, of which 106 were treated with Pravastatin (20 mg in the children aged 8 to 13 years and 40 mg in the adolescents aged 14 to 18 years) for 2 years, there were no detectable differences seen in any of the endocrine parameters (ACTH, cortisol, DHEAS, FSH, LH, TSH, estradiol [girls] or testosterone [boys]) relative to placebo. There were no detectable differences seen in height and weight changes, testicular volume changes, or Tanner score relative to placebo.
Adverse Reactions
Pravastatin is generally well tolerated; adverse reactions have usually been mild and transient. In 4 month-long placebo-controlled trials, 1.7% of Pravastatin-treated patients and 1.2% of placebo-treated patients were discontinued from treatment because of adverse experiences attributed to study drug therapy; this difference was not statistically significant.
6.1 Adverse Clinical Events
Short-Term Controlled Trials
In the Pravastatin sodium placebo-controlled clinical trials database of 1313 patients (age range 20 to 76 years, 32.4% women, 93.5% Caucasians, 5% Blacks, 0.9% Hispanics, 0.4% Asians, 0.2% Others) with a median treatment duration of 14 weeks, 3.3% of patients on Pravastatin sodium and 1.2% patients on placebo discontinued due to adverse events regardless of causality. The most common adverse reactions that led to treatment discontinuation and occurred at an incidence greater than placebo were: liver function test increased, nausea, anxiety/depression, and dizziness.
All adverse clinical events (regardless of causality) reported in ≥ 2% of Pravastatin-treated patients in placebo-controlled trials of up to 8 months duration are identified in Table 1:
Table 1: Adverse Events in ≥ 2% of Patients Treated With Pravastatin 5 to 40 mg and at an Incidence Greater Than Placebo in Short-Term Placebo-Controlled Trials (% of Patients) | ||||||
Body System/Event | 5 mg N = 100 | 10 mg N = 153 | 20 mg N = 478 | 40 mg N = 171 | Any Dose N = 902 | Placebo N = 411 |
Cardiovascular | ||||||
Angina Pectoris | 5.0 | 4.6 | 4.8 | 3.5 | 4.5 | 3.4 |
Dermatologic | ||||||
Rash | 3.0 | 2.6 | 6.7 | 1.2 | 4.5 | 1.4 |
Gastrointestinal | ||||||
Nausea/Vomiting | 4.0 | 5.9 | 10.5 | 2.3 | 7.4 | 7.1 |
Diarrhea | 8.0 | 8.5 | 6.5 | 4.7 | 6.7 | 5.6 |
Flatulence | 2.0 | 3.3 | 4.6 | 0.0 | 3.2 | 4.4 |
Dyspepsia/ | 0.0 | 3.3 | 3.6 | 0.6 | 2.5 | 2.7 |
Abdominal | 2.0 | 3.3 | 2.1 | 0.6 | 2.0 | 2.4 |
General | ||||||
Fatigue | 4.0 | 1.3 | 5.2 | 0.0 | 3.4 | 3.9 |
Chest Pain | 4.0 | 1.3 | 3.3 | 1.2 | 2.7 | 1.9 |
Influenza | 4.0 | 2.6 | 1.9 | 0.6 | 2.0 | 0.7 |
Musculoskeletal | ||||||
Musculoskeletal | 13.0 | 3.9 | 13.2 | 5.3 | 10.1 | 10.2 |
Myalgia | 1.0 | 2.6 | 2.9 | 1.2 | 2.3 | 1.2 |
Nervous System | ||||||
Headache | 5.0 | 6.5 | 7.5 | 3.5 | 6.3 | 4.6 |
Dizziness | 4.0 | 1.3 | 5.2 | 0.6 | 3.5 | 3.4 |
Respiratory | ||||||
Pharyngitis | 2.0 | 4.6 | 1.5 | 1.2 | 2.0 | 2.7 |
Upper Respiratory | ||||||
Infection | 6.0 | 9.8 | 5.2 | 4.1 | 5.9 | 5.8 |
Rhinitis | 7.0 | 5.2 | 3.8 | 1.2 | 3.9 | 4.9 |
Cough | 4.0 | 1.3 | 3.1 | 1.2 | 2.5 | 1.7 |
Investigation | ||||||
ALT Increased | 2.0 | 2.0 | 4.0 | 1.2 | 2.9 | 1.2 |
g-GT Increased | 3.0 | 2.6 | 2.1 | 0.6 | 2.0 | 1.2 |
CPK Increased | 5.0 | 1.3 | 5.2 | 2.9 | 4.1 | 3.6 |
The safety and tolerability of Pravastatin sodium at a dose of 80 mg in 2 controlled trials with a mean exposure of 8.6 months was similar to that of Pravastatin sodium at lower doses except that 4 out of 464 patients taking 80 mg of Pravastatin had a single elevation of CK > 10 times ULN compared to 0 out of 115 patients taking 40 mg of Pravastatin.
Long-Term Controlled Morbidity and Mortality Trials
In the Pravastatin sodium placebo-controlled clinical trials database of 21,483 patients (age range 24 to 75 years, 10.3% women, 52.3% Caucasians, 0.8% Blacks, 0.5% Hispanics, 0.1% Asians, 0.1% Others, 46.1% Not Recorded) with a median treatment duration of 261 weeks, 8.1% of patients on Pravastatin sodium and 9.3% patients on placebo discontinued due to adverse events regardless of causality.
Adverse event data were pooled from several double-blind, placebo-controlled trials (e.g., West of Scotland Coronary Prevention Study [WOS]; Pravastatin Limitation of Atherosclerosis in the Coronary Arteries study [PLAC I]; Pravastatin, Lipids and Atherosclerosis in the Carotids study [PLAC II]; Regression Growth Evaluation Statin Study [REGRESS]; and Kuopio Atherosclerosis Prevention Study [KAPS]) involving a total of 10,764 patients treated with Pravastatin 40 mg and 10,719 patients treated with placebo. The safety and tolerability profile in the Pravastatin group was comparable to that of the placebo group. Patients were exposed to Pravastatin for a mean of 4.0 to 5.1 years in, among other trials, WOS and 1.9 to 2.9 years in PLAC I, PLAC II, KAPS, and REGRESS. In these long-term trials, the most common reasons for discontinuation were mild, non-specific gastrointestinal complaints. Collectively, these trials represent 47,613 patient-years of exposure to Pravastatin. All clinical adverse events (regardless of causality) occurring in ≥ 2% of patients treated with Pravastatin in these studies are identified in Table 2.
Table 2: Adverse Events in ≥ 2% of Patients Treated With Pravastatin 40 mg and at an Incidence Greater Than Placebo in Long-Term Placebo-Controlled Trials | ||
Body System/Event | Pravastatin (N = 10,764) % of patients | Placebo (N = 10,719) % of patients |
Dermatologic | ||
Rash (including dermatitis) | 7.2 | 7.1 |
General | ||
Edema | 3.0 | 2.7 |
Fatigue | 8.4 | 7.8 |
Chest Pain | 10.0 | 9.8 |
Fever | 2.1 | 1.9 |
Weight Gain | 3.8 | 3.3 |
Weight Loss | 3.3 | 2.8 |
Musculoskeletal | ||
Musculoskeletal Pain | 24.9 | 24.4 |
Muscle Cramp | 5.1 | 4.6 |
Musculoskeletal Traumatism | 10.2 | 9.6 |
Nervous System | ||
Dizziness | 7.3 | 6.6 |
Sleep Disturbance | 3.0 | 2.4 |
Anxiety/Nervousness | 4.8 | 4.7 |
Paresthesia | 3.2 | 3.0 |
Renal/Genitourinary | ||
Urinary Tract Infection | 2.7 | 2.6 |
Respiratory | ||
Upper Respiratory Tract Infection | 21.2 | 20.2 |
Cough | 8.2 | 7.4 |
Influenza | 9.2 | 9.0 |
Pulmonary Infection | 3.8 | 3.5 |
Sinus Abnormality | 7.0 | 6.7 |
Tracheobronchitis | 3.4 | 3.1 |
Special Senses | ||
Vision Disturbance (includes blurred vision, diplopia) | 3.4 | 3.3 |
Infections | ||
Viral Infection | 3.2 | 2.9 |
In addition to the events listed above in the long-term trials table, events of probable, possible, or uncertain relationship to study drug that occurred in < 2.0% of Pravastatin-treated patients in the long-term trials included the following:
Dermatologic: scalp hair abnormality (including alopecia), urticaria.
Endocrine/Metabolic: sexual dysfunction, libido change.
General: flushing.
Immunologic: allergy, edema head/neck.
Musculoskeletal: muscle weakness.
Nervous System: vertigo, insomnia, memory impairment, neuropathy (including peripheral neuropathy).
Special Senses: taste disturbance.
6.2 Postmarketing Experience
In addition to the events reported above, as with other drugs in this class, the following events have been reported rarely during postmarketing experience with Pravastatin sodium, regardless of causality assessment:
Musculoskeletal: myopathy, rhabdomyolysis.
Nervous System: dysfunction of certain cranial nerves (including alteration of taste, impairment of extraocular movement, facial paresis), peripheral nerve palsy.
There have been rare postmarketing reports of cognitive impairment (e.g., memory loss, forgetfulness, amnesia, memory impairment, confusion) associated with statin use. These cognitive issues have been reported for 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).
Hypersensitivity: anaphylaxis, angioedema, lupus erythematosus-like syndrome, polymyalgia rheumatica, dermatomyositis, vasculitis, purpura, hemolytic anemia, positive ANA, ESR increase, arthritis, arthralgia, asthenia, photosensitivity, chills, malaise, toxic epidermal necrolysis, erythema multiforme (including Stevens-Johnson syndrome).
Gastrointestinal: abdominal pain, constipation, pancreatitis, hepatitis (including chronic active hepatitis), cholestatic jaundice, fatty change in liver, cirrhosis, fulminant hepatic necrosis, hepatoma.
Dermatologic: a variety of skin changes (e.g., nodules, discoloration, dryness of mucous membranes, changes to hair/nails).
Renal: urinary abnormality (including dysuria, frequency, nocturia).
Respiratory: dyspnea.
Reproductive: gynecomastia.
Laboratory Abnormalities: liver function test abnormalities, thyroid function abnormalities.
6.3 Laboratory Test Abnormalities
Increases in ALT, AST values and CPK have been observed [see Warnings and Precautions (5.1, 5.2)].
Transient, asymptomatic eosinophilia has been reported. Eosinophil counts usually returned to normal despite continued therapy. Anemia, thrombocytopenia, and leukopenia have been reported with statins.
6.4 Pediatric Patients
In a 2 year, double-blind, placebo-controlled study involving 100 boys and 114 girls with HeFH (n = 214; age range 8 to 18.5 years, 53% female, 95% Caucasians, < 1% Blacks, 3% Asians, 1% Other), the safety and tolerability profile of Pravastatin was generally similar to that of placebo [see Warnings and Precautions (5.3), Use in Specific Populations (8.4), and Clinical Pharmacology (12.3)].
Drug Interactions
For the concurrent therapy of either cyclosporine, fibrates, niacin (nicotinic acid), or erythromycin, the risk of myopathy increases [see Warnings and Precautions (5.1) and Clinical Pharmacology (12.3)].
7.1 Cyclosporine
The risk of myopathy/rhabdomyolysis is increased with concomitant administration of cyclosporine. Limit Pravastatin to 20 mg once daily for concomitant use with cyclosporine [see Dosage and Administration (2.5), Warnings and Precautions (5.1), and Clinical Pharmacology (12.3)].
7.2 Clarithromycin
The risk of myopathy/rhabdomyolysis is increased with concomitant administration of clarithromycin. Limit Pravastatin to 40 mg once daily for concomitant use with clarithromycin [see Dosage and Administration (2.6), Warnings and Precautions (5.1), and Clinical Pharmacology (12.3)].
USE IN SPECIFIC POPULATIONS
Pregnancy
Teratogenic Effects
Pregnancy category X
[See Contraindications (4.3).]
Safety in pregnant women has not been established. Available data in women inadvertently taking Pravastatin while pregnant do not suggest any adverse clinical events. However, there are no adequate and well-controlled studies in pregnant women. Therefore, it is not known whether Pravastatin can cause fetal harm when administered to a pregnant woman or can affect reproductive capacity. Pravastatin should be used during pregnancy only if the potential benefit outweighs the potential risk to the fetus and patients have been informed of the potential hazards.
Rare reports of congenital anomalies have been received following intrauterine exposure to other statins. In a review2 of approximately 100 prospectively followed pregnancies in women exposed to simvastatin or lovastatin, the incidences of congenital anomalies, spontaneous abortions, and fetal deaths/stillbirths did not exceed what would be expected in the general population. The number of cases is adequate to exclude a ≥ 3 to 4 fold increase in congenital anomalies over the background incidence. In 89% of the prospectively followed pregnancies, drug treatment was initiated prior to pregnancy and was discontinued at some point in the first trimester when pregnancy was identified. As safety in pregnant women has not been established and there is no apparent benefit to therapy with Pravastatin sodium during pregnancy [see Contraindications (4.3)], treatment should be immediately discontinued as soon as pregnancy is recognized. Pravastatin sodium should be administered to women of childbearing potential only when such patients are highly unlikely to conceive and have been informed of the potential hazards.
Pravastatin was neither embryolethal nor teratogenic in rats at doses up to 1000 mg/kg daily or in rabbits at doses of up to 50 mg/kg daily. These doses resulted in 10 times (rabbit) or 120 times (rat) the human exposure at 80 mg/day maximum recommended human dose (MRHD) based on surface area (mg/m2).
In pregnant rats given oral gavage doses of 4, 20, 100, 500, and 1000 mg/kg/day from gestation days 7 through 17 (organogenesis) increased mortality of offspring and skeletal anomalies were observed at 100 mg/kg/day systemic exposure, 10 times the human exposure at 80 mg/day MRHD based on body surface area (mg/m2).
In pregnant rats given oral gavage doses of 10, 100, and 1000 mg/kg/day from gestation day 17 through lactation day 21 (weaning) increased mortality of offspring and developmental delays were observed at 100 mg/kg/day systemic exposure, 12 times the human exposure at 80 mg/day MRHD based on body surface area (mg/m2).
Nursing Mothers
A small amount of Pravastatin is excreted in human breast milk. Because of the potential for serious adverse reactions in nursing infants, women taking Pravastatin sodium should not nurse [see Contraindications (4.4)].
Pravastatin crosses the placenta and is found in fetal tissue at 30% maternal plasma levels following a single 20 mg/kg dose given to pregnant rats on gestation day 18. Similar studies in lactating rats indicate secretion of Pravastatin into breast milk at 0.2 to 6.5 times higher levels than maternal plasma at exposures equivalent to 2 times human exposure at the MRHD.
Pediatric Use
The safety and effectiveness of Pravastatin sodium in children and adolescents from 8 to 18 years of age have been evaluated in a placebo-controlled study of 2 years duration. Patients treated with Pravastatin had an adverse experience profile generally similar to that of patients treated with placebo with influenza and headache commonly reported in both treatment groups [see Adverse Reactions (6.4)]. Doses greater than 40 mg have not been studied in this population. Children and adolescent females of childbearing potential should be counseled on appropriate contraceptive methods while on Pravastatin therapy [see Contraindications (4.3) and Use in Specific Populations (8.1)]. For dosing information [see Dosage and Administration (2.3)].
Double-blind, placebo-controlled Pravastatin studies in children less than 8 years of age have not been conducted.
Geriatric Use
The beneficial effect of Pravastatin in elderly subjects in reducing cardiovascular events and in modifying lipid profiles was similar to that seen in younger subjects. The adverse event profile in the elderly was similar to that in the overall population. Other reported clinical experience has not identified differences in responses to Pravastatin between elderly and younger patients.
Mean Pravastatin AUCs are slightly (25% to 50%) higher in elderly subjects than in healthy young subjects, but mean maximum plasma concentration (Cmax), time to maximum plasma concentration (Tmax), and half-life (t½) values are similar in both age groups and substantial accumulation of Pravastatin would not be expected in the elderly [see Clinical Pharmacology (12.3)].
Since advanced age (≥ 65 years) is a predisposing factor for myopathy, Pravastatin sodium should be prescribed with caution in the elderly [see Warnings and Precautions (5.1) and Clinical Pharmacology (12.3)].
Homozygous Familial Hypercholesterolemia
Pravastatin has not been evaluated in patients with rare homozygous familial hypercholesterolemia. In this group of patients, it has been reported that statins are less effective because the patients lack functional LDL receptors.
Overdosage
To date, there has been limited experience with overdosage of Pravastatin. If an overdose occurs, it should be treated symptomatically with laboratory monitoring and supportive measures should be instituted as required.
Pravastatin Description
Pravastatin sodium is one of a class of lipid-lowering compounds, the statins, which reduce cholesterol biosynthesis. These agents are competitive inhibitors of HMG-CoA reductase, the enzyme catalyzing the early rate-limiting step in cholesterol biosynthesis, conversion of HMG-CoA to mevalonate.
Pravastatin sodium is designated chemically as 1-naphthaleneheptanoic acid, 1,2,6,7,8,8a-hexahydro-β,δ,6-trihydroxy-2-methyl-8-(2-methyl-1-oxobutoxy)-, monosodium salt, [1S-[1α (βS*,δS*),2α,6α,8β(R*),8aα]]-. It has the following structural formula:
Chemical Structure of Pravastatin Sodium
Pravastatin sodium is an odorless, white to off-white, fine or crystalline powder. It is a relatively polar hydrophilic compound with a partition coefficient (octanol/water) of 0.59 at a pH of 7.0. It is soluble in methanol and water (> 300 mg/mL), slightly soluble in isopropanol, and practically insoluble in acetone, acetonitrile, chloroform, and ether.
Pravastatin sodium tablets, USP are available for oral administration as 10 mg, 20 mg and 40 mg tablets. Inactive ingredients include: calcium phosphate dibasic, croscarmellose sodium, crospovidone, lactose, microcrystalline cellulose, povidone and sodium stearyl fumarate. Additionally, the 10 mg tablet contains ferric oxide red; the 20 mg tablet contains ferric oxide yellow; the 40 mg tablet contains FD&C Blue No. 1 and Yellow D&C No. 10.
Pravastatin - Clinical Pharmacology
Mechanism of Action
Pravastatin is a reversible inhibitor of 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase, the enzyme that catalyzes the conversion of HMG-CoA to mevalonate, an early and rate limiting step in the biosynthetic pathway for cholesterol. In addition, Pravastatin reduces VLDL and TG and increases HDL-C.
Pharmacokinetics
General
Absorption: Pravastatin sodium is administered orally in the active form. In studies in man, peak plasma Pravastatin concentrations occurred 1 to 1.5 hours upon oral administration. Based on urinary recovery of total radiolabeled drug, the average oral absorption of Pravastatin is 34% and absolute bioavailability is 17%. While the presence of food in the gastrointestinal tract reduces systemic bioavailability, the lipid-lowering effects of the drug are similar whether taken with or 1 hour prior to meals.
Pravastatin plasma concentrations, including area under the concentration-time curve (AUC), Cmax, and steady-state minimum (Cmin), are directly proportional to administered dose. Systemic bioavailability of Pravastatin administered following a bedtime dose was decreased 60% compared to that following an AM dose. Despite this decrease in systemic bioavailability, the efficacy of Pravastatin administered once daily in the evening, although not statistically significant, was marginally more effective than that after a morning dose.
The coefficient of variation (CV), based on between-subject variability, was 50% to 60% for AUC. The geometric means of Pravastatin Cmax and AUC following a 20 mg dose in the fasted state were 26.5 ng/mL and 59.8 ng*hr/mL, respectively.
Steady-state AUCs, Cmax, and Cmin plasma concentrations showed no evidence of Pravastatin accumulation following once or twice daily administration of Pravastatin sodium tablets.
Distribution: Approximately 50% of the circulating drug is bound to plasma proteins.
Metabolism: The major biotransformation pathways for Pravastatin are: (a) isomerization to 6-epi Pravastatin and the 3α-hydroxyisomer of Pravastatin (SQ 31,906) and (b) enzymatic ring hydroxylation to SQ 31,945. The 3α-hydroxyisomeric metabolite (SQ 31,906) has 1/10 to 1/40 the HMG-CoA reductase inhibitory activity of the parent compound. Pravastatin undergoes extensive first-pass extraction in the liver (extraction ratio 0.66).
Excretion: Approximately 20% of a radiolabeled oral dose is excreted in urine and 70% in the feces. After intravenous administration of radiolabeled Pravastatin to normal volunteers, approximately 47% of total body clearance was via renal excretion and 53% by non-renal routes (i.e., biliary excretion and biotransformation).
Following single dose oral administration of 14C-Pravastatin, the radioactive elimination t1/2 for Pravastatin is 1.8 hours in humans.
Specific Populations
Renal Impairment: A single 20 mg oral dose of Pravastatin was administered to 24 patients with varying degrees of renal impairment (as determined by creatinine clearance). No effect was observed on the pharmacokinetics of Pravastatin or its 3α-hydroxy isomeric metabolite (SQ 31,906). Compared to healthy subjects with normal renal function, patients with severe renal impairment had 69% and 37% higher mean AUC and Cmax values, respectively, and a 0.61 hour shorter t1/2 for the inactive enzymatic ring hydroxylation metabolite (SQ 31,945).
Hepatic Impairment: In a study comparing the kinetics of Pravastatin in patients with biopsy confirmed cirrhosis (N = 7) and normal subjects (N = 7), the mean AUC varied 18 fold in cirrhotic patients and 5 fold in healthy subjects. Similarly, the peak Pravastatin values varied 47 fold for cirrhotic patients compared to 6 fold for healthy subjects [see Warnings and Precautions (5.2)].
Geriatric: In a single oral dose study using Pravastatin 20 mg, the mean AUC for Pravastatin was approximately 27% greater and the mean cumulative urinary excretion (CUE) approximately 19% lower in elderly men (65 to 75 years old) compared with younger men (19 to 31 years old). In a similar study conducted in women, the mean AUC for Pravastatin was approximately 46% higher and the mean CUE approximately 18% lower in elderly women (65 to 78 years old) compared with younger women (18 to 38 years old). In both studies, Cmax, Tmax, and t1/2 values were similar in older and younger subjects [see Use in Specific Populations (8.5)].
Pediatric: After 2 weeks of once-daily 20 mg oral Pravastatin administration, the geometric means of AUC were 80.7 (CV 44%) and 44.8 (CV 89%) ng*hr/mL for children (8 to 11 years, N = 14) and adolescents (12 to 16 years, N = 10), respectively. The corresponding values for Cmax were 42.4 (CV 54%) and 18.6 ng/mL (CV 100%) for children and adolescents, respectively. No conclusion can be made based on these findings due to the small number of samples and large variability [see Use in Specific Populations (8.4)].
Drug-Drug Interactions
Table 3: Effect of Coadministered Drugs on the Pharmacokinetics of Pravastatin
Coadministered Drug and Dosing | Pravastatin | ||
Dose (mg) | Change in | Change in | |
Cyclosporine 5 mg/kg single dose | 40 mg single | ↑ 282% | ↑ 327% |
Clarithromycin 500 mg BID for | 40 mg OD | ↑ 110% | ↑ 128% |
Colestipol 10 g single dose | 20 mg single | ↓ 47% | ↓ 53% |
Cholestyramine 4 g single dose | 20 mg single | ||
Administered simultaneously | ↓ 40% | ↓ 39% | |
Administered 1 hour apart | ↑ 12% | ↑ 30% | |
Administered 4 hours apart | ↓ 12% | ↓ 6.8% | |
Cholestyramine 24 g OD for | 20 mg BID | ↓ 51% | ↑ 4.9% |
5 mg BID for | ↓ 38% | ↑ 23% | |
10 mg BID | ↓ 18% | ↓ 33% | |
Fluconazole | |||
200 mg IV for 6 days | 20 mg PO + | ↓ 34% | ↓ 33% |
200 mg PO for 6 days | 20 mg PO + | ↓ 16% | ↓ 16% |
Verapamil IR 120 mg for 1 day and | 40 mg single | ↑ 31% | ↑ 42% |
Cimetidine 300 mg QID for 3 days | 20 mg single | ↑ 30% | ↑ 9.8% |
Antacids 15 mL QID for 3 days | 20 mg single | ↓ 28% | ↓ 24% |
Digoxin 0.2 mg OD for 9 days | 20 mg OD | ↑ 23% | ↑ 26% |
Probucol 500 mg single dose | 20 mg single | ↑ 14% | ↑ 24% |
Warfarin 5 mg OD for 6 days | 20 mg BID | ↓ 13% | ↓ 6.7% |
Itraconazole 200 mg OD for 30 days | 40 mg OD | ↑ 11% | ↑ 17% |
Gemfibrozil 600 mg single dose | 20 mg single | ↓ 7.0% | ↓ 20% |
Aspirin 324 mg single dose | 20 mg single | ↑ 4.7% | ↑8.9% |
Nicotinic Acid 1 g single dose | 20 mg single | ↓ 3.6% | ↓ 8.2% |
Diltiazem | 20 mg single | ↑ 2.7% | ↑ 30% |
Grapefruit juice | 40 mg single | ↓ 1.8% | ↑ 3.7% |
BID = twice daily; OD = once daily; QID = four times daily
Table 4: Effect of Pravastatin on the Pharmacokinetics of Coadministered Drugs
Pravastatin Dosing Regimen | Name and Dose | Change in | Change in Cmax |
20 mg BID for 6 days | Warfarin 5 mg OD for | ↑ 17% | ↑ 15% |
Chain in mean | ↑ 0.4 sec | ||
20 mg OD for 9 days | Digoxin 0.2 mg OD for | ↑ 4.6% | ↑ 5.3% |
20 mg BID for 4 weeks | Antipyrine 1.2 g single dose | ↑ 3.0% | Not Reported |
10 mg BID for 4 weeks | ↑ 1.6% | ||
5 mg BID for 4 weeks | ↑ Less than 1% |
BID = twice daily; OD = once daily
Nonclinical Toxicology
Carcinogenesis and Mutagenesis and Impairment of Fertility
In a 2 year study in rats fed Pravastatin at doses of 10, 30, or 100 mg/kg body weight, there was an increased incidence of hepatocellular carcinomas in males at the highest dose (p < 0.01). These effects in rats were observed at approximately 12 times the human dose (HD) of 80 mg based on body surface area
No comments:
Post a Comment