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Lipitor (atorvastatin) lowers cholesterol by inhibiting HMG-CoA reductase in the liver, reducing LDL by 20-60% depending on dose.[1] It begins this process within hours of the first dose, but measurable blood cholesterol drops take 2 weeks. Full effects on lipid levels occur after 4 weeks of daily use.[1][2]
Most see no immediate symptoms since Lipitor treats high cholesterol asymptomatically. Doctors check bloodwork at 4-6 weeks to confirm reductions in LDL and triglycerides, with HDL often rising slightly.[2] Steady-state drug levels in the body stabilize after 1-2 weeks.[1]
If lipids haven't improved by 4 weeks, providers may increase the dose (up to 80 mg) or add ezetimibe. Genetic factors like poor CYP3A4 metabolism can slow response in 5-10% of patients.[3] Retest sooner if starting high-risk therapy.
Lipitor reaches maximum blood levels 1-2 hours after dosing, with a half-life of 14 hours, supporting once-daily use.[1] Food delays absorption slightly but doesn't reduce effectiveness.
Lipitor acts faster than less potent statins like pravastatin (full effect in 6 weeks) but matches rosuvastatin's timeline.[2] Crestor may edge it on LDL reduction at equal doses. [1]: Lipitor Prescribing Information (Pfizer) [2]: Drugs.com - Atorvastatin Patient Guide [3]: DrugPatentWatch.com - Atorvastatin Patents and Metabolism
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