Atorvastatin use is contraindicated during breastfeeding [see Contraindications (4)]. There is no available information on the effects of the drug on the breastfed infant or the effects of the drug on milk production. It is not known whether atorvastatin is present in human milk, but it has been shown that another drug in this class passes into human milk and atorvastatin is present in rat milk. Because of the potential for serious adverse reactions in a breastfed infant, advise women that breastfeeding is not recommended during treatment with atorvastatin.
Atorvastatin may cause fetal harm when administered to a pregnant woman. Advise females of reproductive potential to use effective contraception during treatment with atorvastatin [see Use in Specific Populations (8.1)].
Heterozygous Familial Hypercholesterolemia (HeFH)
The safety and effectiveness of atorvastatin have been established in pediatric patients,10 years to 17 years of age, with HeFH as an adjunct to diet to reduce total cholesterol, LDL-C, and apo B levels when, after an adequate trial of diet therapy, the following are present:
- LDL-C ≥ 190 mg/dL, or
- LDL-C ≥ 160 mg/dL and
- a positive family history of FH, or premature CVD in a first, or second-degree relative, or
- two or more other CVD risk factors are present.
- A placebo-controlled clinical trial of 6 months duration in 187 boys and postmenarchal girls,10 years to 17 years of age. Patients treated with 10 mg or 20 mg daily atorvastatin had an adverse reaction profile generally similar to that of patients treated with placebo. In this limited controlled study, there was no significant effect on growth or sexual maturation in boys or on menstrual cycle length in girls.
The long-term efficacy of atorvastatin therapy initiated in childhood to reduce morbidity and mortality in adulthood has not been established.
The safety and efficacy of atorvastatin have not been established in pediatric patients younger than 10 years of age with HeFH.
Additional pediatric use information is approved for Pfizer’s LIPITOR (atorvastatin calcium) tablets. However, due to Pfizer’s marketing exclusivity rights, this drug product is not labeled with that pediatric information.
Homozygous Familial Hypercholesterolemia (HoFH)
Clinical efficacy of atorvastatin with dosages up to 80 mg/day for 1 year was evaluated in an uncontrolled study of patients with HoFH including 8 pediatric patients [see Clinical Studies (14.5)].
Of the 39,828 patients who received atorvastatin in clinical studies, 15,813 (40%) were ≥ 65 years old and 2,800 (7%) were ≥ 75 years old. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older adults cannot be ruled out. Since advanced age (≥65 years) is a predisposing factor for myopathy, atorvastatin should be prescribed with caution in the elderly.
Atorvastatin is contraindicated in patients with active liver disease which may include unexplained persistent elevations in hepatic transaminase levels [see Contraindications (4) and Clinical Pharmacology (12.3)].
There is no specific treatment for atorvastatin overdosage. In the event of an overdose, the patient should be treated symptomatically, and supportive measures instituted as required. Due to extensive drug binding to plasma proteins, hemodialysis is not expected to significantly enhance atorvastatin clearance.
Atorvastatin is a synthetic lipid-lowering agent. Atorvastatin is an inhibitor of 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase. This enzyme catalyzes the conversion of HMG-CoA to mevalonate, an early and rate-limiting step in cholesterol biosynthesis.
Atorvastatin calcium, USP is [R-(R*, R*)]-2-(4-fluorophenyl)-ß,δ-dihydroxy-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-Pyrrole-1-heptanoic acid, calcium salt (2:1) trihydrate. The molecular formula of atorvastatin calcium is (C33 H34 FN2 O5 )2 Ca•3H2 O and its molecular weight is 1209.42. Its structural formula is:
Atorvastatin calcium USP is a white to off-white crystalline powder that is insoluble in aqueous solutions of pH 4 and below. Atorvastatin calcium is very slightly soluble in distilled water, pH 7.4 phosphate buffer, and acetonitrile; slightly soluble in ethanol; and freely soluble in methanol.
Atorvastatin Calcium Tablets, USP for oral administration contain 10 mg, 20 mg, 40 mg, or 80 mg atorvastatin and the following inactive ingredients: calcium carbonate, croscarmellose sodium, hydroxypropyl cellulose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, Opadry White YS-1-7040 (hypromellose, polyethylene glycol, talc, titanium dioxide) and polysorbate 80.
FDA approved dissolution test specifications differ from USP.
Atorvastatin is a selective, competitive inhibitor of HMG-CoA reductase, the rate-limiting enzyme that converts 3-hydroxy-3-methylglutaryl-coenzyme A to mevalonate, a precursor of sterols, including cholesterol. In animal models, atorvastatin lowers plasma cholesterol and lipoprotein levels by inhibiting HMG-CoA reductase and cholesterol synthesis in the liver and by increasing the number of hepatic LDL receptors on the cell surface to enhance uptake and catabolism of LDL; atorvastatin also reduces LDL production and the number of LDL particles.
Atorvastatin, as well as some of its metabolites, are pharmacologically active in humans. The liver is the primary site of action and the principal site of cholesterol synthesis and LDL clearance. Drug dosage, rather than systemic drug concentration, correlates better with LDL-C reduction. Individualization of drug dosage should be based on therapeutic response [see Dosage and Administration (2)].
Absorption: Atorvastatin is rapidly absorbed after oral administration; maximum plasma concentrations occur within 1 to 2 hours. Extent of absorption increases in proportion to atorvastatin dose. The absolute bioavailability of atorvastatin (parent drug) is approximately 14% and the systemic availability of HMG-CoA reductase inhibitory activity is approximately 30%. The low systemic availability is attributed to presystemic clearance in gastrointestinal mucosa and/or hepatic first-pass metabolism. Although food decreases the rate and extent of drug absorption by approximately 25% and 9%, respectively, as assessed by Cmax and AUC, LDL-C reduction is similar whether atorvastatin is given with or without food. Plasma atorvastatin concentrations are lower (approximately 30% for Cmax and AUC) following evening drug administration compared with morning. However, LDL-C reduction is the same regardless of the time of day of drug administration [see Dosage and Administration (2)].
Distribution: Mean volume of distribution of atorvastatin is approximately 381 liters. Atorvastatin is ≥98% bound to plasma proteins. A blood/plasma ratio of approximately 0.25 indicates poor drug penetration into red blood cells. Based on observations in rats, atorvastatin is likely to be secreted in human milk [see Contraindications (4) and Use in Specific Populations, (8.2)].
Metabolism: Atorvastatin is extensively metabolized to ortho- and parahydroxylated derivatives and various beta-oxidation products. In vitro inhibition of HMG- CoA reductase by ortho — and parahydroxylated metabolites is equivalent to that of atorvastatin. Approximately 70% of circulating inhibitory activity for HMG-CoA reductase is attributed to active metabolites. In vitro studies suggest the importance of atorvastatin metabolism by cytochrome P450 3A4, consistent with increased plasma concentrations of atorvastatin in humans following co-administration with erythromycin, a known inhibitor of this isozyme [see Drug Interactions (7.1)]. In animals, the ortho-hydroxy metabolite undergoes further glucuronidation.
Excretion: Atorvastatin and its metabolites are eliminated primarily in bile following hepatic and/or extra-hepatic metabolism; however, the drug does not appear to undergo enterohepatic recirculation. Mean plasma elimination half-life of atorvastatin in humans is approximately 14 hours, but the half-life of inhibitory activity for HMG-CoA reductase is 20 to 30 hours due to the contribution of active metabolites. Less than 2% of a dose of atorvastatin is recovered in urine following oral administration.
Geriatric: Plasma concentrations of atorvastatin is higher (approximately 40% for Cmax and 30% for AUC) in healthy elderly subjects (age ≥65 years) than in young adults. Clinical data suggest a greater degree of LDL-lowering at any dose of drug in the elderly patient population compared to younger adults [see Use in Specific Populations (8.5)].
Pediatric: Apparent oral clearance of atorvastatin in pediatric subjects appeared similar to that of adults when scaled allometrically by body weight as the body weight was the only significant covariate in atorvastatin population PK model with data including pediatric HeFH patients (ages 10 years to 17 years of age, n=29) in an open-label, 8-week study.
Gender: Plasma concentrations of atorvastatin in women differ from those in men (approximately 20% higher for Cmax and 10% lower for AUC); however, there is no clinically significant difference in LDL-C reduction with atorvastatin between men and women.
Renal Impairment: Renal disease has no influence on the plasma concentrations or LDL-C reduction of atorvastatin; thus, dose adjustment in patients with renal dysfunction is not necessary [see Dosage and Administration (2.5) and Warnings and Precautions (5.1)].
Hemodialysis: While studies have not been conducted in patients with end-stage renal disease, hemodialysis is not expected to significantly enhance clearance of atorvastatin since the drug is extensively bound to plasma proteins.
Hepatic Impairment: In patients with chronic alcoholic liver disease, plasma concentrations of atorvastatin is markedly increased. Cmax and AUC are each 4-fold greater in patients with Childs-Pugh A disease. Cmax and AUC are approximately 16-fold and 11-fold increased, respectively, in patients with Childs-Pugh B disease [see Contraindications (4)].
Drug Interaction Studies
Atorvastatin is a substrate of the hepatic transporters, OATP1B1 and OATP1B3 transporter. Metabolites of atorvastatin are substrates of OATP1B1. Atorvastatin is also identified as a substrate of the efflux transporter BCRP, which may limit the intestinal absorption and biliary clearance of atorvastatin.
|Co-administered drug and dosing regimen||Atorvastatin|
|Dose (mg)||Ratio of AUC *||Ratio of Cmax *|
|†Cyclosporine 5.2 mg/kg/day, stable dose||10 mg QD ‡ for 28 days||8.69||10.66|
|†Tipranavir 500 mg BID §/ritonavir 200 mg BID §, 7 days||10 mg, SD ¶||9.36||8.58|
|†Glecaprevir 400 mg QD ‡/pibrentasvir 120 mg QD ‡, 7 days||10 mg, QD ‡ for 7 days||8.28||22.00|
|†Telaprevir 750 mg q8h #, 10 days||20 mg, SD ¶||7.88||10.60|
|†, ÞSaquinavir 400 mg BID §/ ritonavir 400 mg BID §, 15 days||40 mg QD ‡ for 4 days||3.93||4.31|
|†Elbasvir 50 mg QD ‡/grazoprevir 200 mg QD ‡, 13 days||10 mg SD ¶||1.94||4.34|
|†Simeprevir 150 mg QD ‡, 10 days||40 mg SD ¶||2.12||1.70|
|†Clarithromycin 500 mg BID §, 9 days||80 mg QD ‡ for 8 days||4.54||5.38|
|†Darunavir 300 mg BID §/ritonavir 100 mg BID §, 9 days||10 mg QD ‡ for 4 days||3.45||2.25|
|†Itraconazole 200 mg QD ‡, 4 days||40 mg SD ¶||3.32||1.20|
|†Fosamprenavir 700 mg BID §/ritonavir 100 mg BID §, 14 days||10 mg QD ‡ for 4 days||2.53||2.84|
|†Fosamprenavir 1,400 mg BID §, 14 days||10 mg QD ‡ for 4 days||2.30||4.04|
|†Nelfinavir 1,250 mg BID §, 14 days||10 mg QD ‡ for 28 days||1.74||2.22|
|†Grapefruit Juice, 240 mL QD ‡,ß||40 mg, SD ¶||1.37||1.16|
|Diltiazem 240 mg QD ‡, 28 days||40 mg, SD ¶||1.51||1.00|
|Erythromycin 500 mg QID à, 7 days||10 mg, SD ¶||1.33||1.38|
|Amlodipine 10 mg, single dose||80 mg, SD ¶||1.18||0.91|
|Cimetidine 300 mg QID à, 2 weeks||10 mg QD ‡ for 2 weeks||1.00||0.89|
|Colestipol 10 g BID §, 24 weeks||40 mg QD ‡ for 8 weeks||NA||0.74è|
|MaaloxTC® 30 mL QID à, 17 days||10 mg QD ‡ for 15 days||0.66||0.67|
|Efavirenz 600 mg QD ‡, 14 days||10 mg for 3 days||0.59||1.01|
|†Rifampin 600 mg QD ‡, 7 days (co-administered)ð||40 mg SD ¶||1.12||2.90|
|†Rifampin 600 mg QD ‡, 5 days (doses separated)ð||40 mg SD ¶||0.20||0.60|
|†Gemfibrozil 600 mg BID §, 7 days||40 mg SD ¶||1.35||1.00|
|†Fenofibrate 160 mg QD ‡, 7 days||40 mg SD ¶||1.03||1.02|
|Boceprevir 800 mg TID ø, 7 days||40 mg SD ¶||2.32||2.66|
|Atorvastatin||Co-administered drug and dosing regimen|
|Drug/Dose (mg)||Ratio of AUC||Ratio of Cmax|
|80 mg QD * for 15 days||Antipyrine, 600 mg SD *||1.03||0.89|
|80 mg QD * for 10 days||† Digoxin 0.25 mg QD *, 20 days||1.15||1.20|
|40 mg QD * for 22 days||Oral contraceptive QD *, 2 months|
|— norethindrone 1mg||1.28||1.23|
|— ethinyl estradiol 35mcg||1.19||1.30|
|10 mg, SD ‡||Tipranavir 500 mg BID §/ritonavir 200 mg BID §, 7 days||1.08||0.96|
|10 mg QD * for 4 days||Fosamprenavir 1,400 mg BID §, 14 days||0.73||0.82|
|10 mg QD * for 4 days||Fosamprenavir 700 mg BID/ritonavir 100 mg BID §, 14 days||0.99||0.94|
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