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# Atorvastatin
## Overview
Atorvastatin is a statin medication used to lower cholesterol levels. It works by inhibiting HMG-CoA reductase, an enzyme involved in cholesterol synthesis.
## Primary Indications
* Hyperlipidemia (mixed dyslipidemia, hypercholesterolemia)
* Prevention of cardiovascular events in patients with risk factors for coronary heart disease
## Adult Dosing
* **Hyperlipidemia:** Typically initiated at 10 mg to 20 mg once daily. Doses can range from 10 mg to 80 mg once daily.
* **Cardiovascular Risk Reduction:** Typically initiated at 10 mg to 80 mg once daily.
## Pediatric Dosing
* **Hyperlipidemia:** For patients 10 years and older: 10 mg once daily. Doses can be increased to 20 mg daily. Higher doses are generally not recommended in this age group due to limited long-term safety data.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution. Patients with active liver disease or unexplained persistent elevations of hepatic transaminases should not use atorvastatin. Mild hepatic impairment may require dose reduction.
* **Renal Impairment:** No dose adjustment is generally necessary.
## 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 (muscle pain), arthralgia (joint pain), diarrhea, nausea, headache.
* **Serious:** Rhabdomyolysis (muscle breakdown) with or without acute kidney injury, hepatotoxicity, new-onset diabetes mellitus.
## Key Drug Interactions
* **CYP3A4 Inhibitors (e.g., itraconazole, ketoconazole, clarithromycin, ritonavir):** Increase atorvastatin levels and risk of myopathy. Concurrent use is generally contraindicated or requires significant dose reduction and close monitoring.
* **Grapefruit Juice:** Can increase atorvastatin levels; consumption in large quantities should be avoided.
* **Gemfibrozil, Fenofibrate:** Increased risk of myopathy.
* **Colchicine:** Increased risk of myopathy.
## Monitoring
* Baseline liver function tests (LFTs) and lipid panel.
* LFTs should be monitored as clinically indicated or if signs/symptoms of liver dysfunction develop.
* Monitor for signs and symptoms of myopathy (e.g., muscle pain, tenderness, weakness), particularly if accompanied by fever or malaise. Creatine kinase (CK) levels may be monitored if myopathy is suspected.
## Clinical Pearls
* Atorvastatin is most effective when taken in the evening.
* Patient education regarding signs and symptoms of myopathy is crucial.
* Risk factors for myopathy include advanced age, concomitant use of other medications affecting CYP3A4, hypothyroidism, and high-dose statin therapy.
* Dose is determined by treatment goal and patient response.
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**Disclaimer:** This information is intended for educational purposes only and does not substitute for professional medical advice. Always consult with a qualified healthcare provider to ensure the information is accurate, complete, and appropriate for your specific situation. Verify current prescribing information before making any treatment decisions.
