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## Atorvastatin
### Overview
Atorvastatin is a statin medication used to lower cholesterol levels in the blood. It works by inhibiting HMG-CoA reductase, a key enzyme in cholesterol synthesis.
### Primary Indications
* Hyperlipidemia (primary and secondary prevention)
* Cardiovascular risk reduction
### Adult Dosing
* **Initial Dose:** 10-20 mg orally once daily.
* **Maintenance Dose:** 10-80 mg orally once daily.
* **Maximum Dose:** 80 mg orally once daily.
* Dosing should be individualized based on patient response and lipid goals.
### Pediatric Dosing
* **Children and Adolescents (10-17 years):** 10 mg orally once daily. Doses can be titrated up to 20 mg once daily.
* Dosing in younger children is generally not recommended unless specific familial hypercholesterolemia is diagnosed.
### Dose Adjustments
* **Renal Impairment:** No specific dose adjustment is generally recommended.
* **Hepatic Impairment:** Use with caution. Patients with active liver disease should not use atorvastatin. See Contraindications.
### 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:** Myopathy, rhabdomyolysis, hepatotoxicity, memory impairment, increased blood glucose levels.
### Key Drug Interactions
* **CYP3A4 Inhibitors (e.g., azole antifungals, macrolide antibiotics, protease inhibitors):** Increased risk of myopathy and rhabdomyolysis. Dose of atorvastatin may need to be reduced.
* **Grapefruit Juice:** May increase atorvastatin concentrations. Avoid large quantities.
* **Fibrates and Niacin:** Increased risk of myopathy.
* **Colchicine:** Increased risk of myopathy and rhabdomyolysis.
### Monitoring
* Lipid panel (total cholesterol, LDL, HDL, triglycerides) at baseline and periodically thereafter (e.g., 4-12 weeks after initiation or dose change, then every 6-12 months).
* Liver function tests (ALT, AST) at baseline and as clinically indicated.
* Creatine kinase (CK) if myopathy symptoms occur.
### Clinical Pearls
* Can be taken with or without food.
* Evening dosing may be slightly more effective for cholesterol-lowering in some patients, but consistent daily dosing is key.
* Educate patients on symptoms of myopathy (muscle pain, tenderness, weakness) and to report them promptly.
* Consider risk factors for diabetes when initiating statins.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant guidelines for complete details and to confirm accuracy before making clinical decisions.*
