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# Atorvastatin ## Overview Atorvastatin is a statin medication used to lower cholesterol levels and reduce the risk of cardiovascular events. It works by inhibiting HMG-CoA reductase, an enzyme involved in cholesterol synthesis. ## Primary Indications * Hyperlipidemia (primary and secondary prevention) * Prevention of cardiovascular disease in patients with risk factors ## Adult Dosing * **Hyperlipidemia:** * Initial dose: 10-20 mg orally once daily. * Maintenance dose: 10-80 mg orally once daily. * Maximum dose: 80 mg orally once daily. * **Cardiovascular Disease Prevention:** * Generally, 40-80 mg orally once daily. ## Pediatric Dosing * **Hyperlipidemia (ages 10-17 years):** * Initial dose: 10 mg orally once daily. * Maintenance dose: 10-20 mg orally once daily. (Maximum dose 40 mg/day in this age group). ## Dose Adjustments * **Renal Impairment:** No dose adjustment generally required. * **Hepatic Impairment:** Use with caution. Initiate at the lowest dose. Contraindicated in active liver disease. ## Contraindications * Active liver disease or unexplained persistent elevations of serum transaminases. * Hypersensitivity to atorvastatin or any component of the formulation. * Pregnancy and breastfeeding. ## Adverse Effects * **Common:** Myalgia, arthralgia, diarrhea, nausea, headache. * **Serious:** Rhabdomyolysis (muscle breakdown), hepatotoxicity, hyperglycemia, memory impairment, potential increased risk of hemorrhagic stroke (especially in patients with prior stroke). ## Key Drug Interactions * **CYP3A4 inhibitors (e.g., clarithromycin, itraconazole, ritonavir):** Increase atorvastatin levels, increasing risk of myopathy. Concurrent use generally not recommended or requires dose reduction of atorvastatin. * **CYP3A4 inducers (e.g., rifampin):** May decrease atorvastatin levels. * **Fibrates and other lipid-lowering agents (e.g., gemfibrozil):** Increased risk of myopathy and rhabdomyolysis. * **Colchicine:** Increased risk of myopathy and rhabdomyolysis. * **Grapefruit juice:** May increase atorvastatin levels. Limit intake. ## Monitoring * Liver function tests (ALT, AST) at baseline and as clinically indicated. * Creatine kinase (CK) if myopathy is suspected. * Lipid panel at baseline and at appropriate intervals (e.g., 4-12 weeks after initiation or dose change). * Blood glucose levels. ## Clinical Pearls * Take atorvastatin at any time of day, with or without food. * Lifestyle modifications (diet, exercise) are essential adjuncts to therapy. * Educate patients on signs and symptoms of myopathy (muscle pain, tenderness, weakness) and to report them immediately. * Consider lower doses in patients taking concomitant CYP3A4 inhibitors. * Pregnancy testing is recommended for women of childbearing potential. --- **Disclaimer:** This information is for educational purposes only and does not substitute for professional medical advice. Always consult with a qualified healthcare provider and refer to the most current prescribing information for definitive guidance.