Standard Lipitor Dosages
Lipitor (atorvastatin) treats high cholesterol and starts at 10-20 mg once daily for most adults, increasing to 40-80 mg if needed based on LDL goals and tolerance.[1]
When to Reduce Dosage
Reduce dosage if liver enzymes exceed 3 times the upper normal limit, muscle symptoms suggest myopathy, or kidney/liver impairment occurs. Common reductions: from 80 mg to 40 mg or 20 mg, or to 10 mg in severe cases.[1][2]
Dosage Adjustments for Impaired Kidney Function
No initial reduction needed for mild-moderate kidney issues (CrCl >30 mL/min). For CrCl <30 mL/min on hemodialysis, cap at 20 mg daily; start lower if combined with other factors like age >70.[1]
Dosage Adjustments for Liver Impairment
Avoid in active liver disease. For mild impairment (Child-Pugh A), use caution and start at 10 mg, max 20 mg. No data supports use in moderate-severe impairment.[1][2]
Dosage in Drug Interactions
Reduce by 50% or more with strong CYP3A4 inhibitors like itraconazole (max 20 mg), clarithromycin, or HIV protease inhibitors. With moderate inhibitors like diltiazem, limit to 40 mg max. No adjustment needed with fibrates except gemfibrozil (avoid combo).[1]
Recommendations for Elderly or Low-Weight Patients
Start at 10 mg in patients >65 or under 70 kg; titrate slowly to minimize myopathy risk.[1]
What If Side Effects Occur
Stop or reduce if unexplained muscle pain, weakness, or dark urine appears—risk of rhabdomyolysis rises at >40 mg. Recheck liver enzymes periodically.[2]
[1]: Lipitor Prescribing Information (Pfizer)
[2]: Drugs.com - Lipitor Dosage Guide