How atorvastatin lowers cholesterol
Atorvastatin inhibits HMG-CoA reductase, the rate-limiting enzyme in the mevalonate pathway — the chain of reactions your liver uses to produce cholesterol. By blocking this enzyme, atorvastatin reduces LDL (bad) cholesterol by 35–55% depending on dose. It also modestly raises HDL and lowers triglycerides.
Does it matter when you take it?
Unlike some older statins (e.g., simvastatin, pravastatin), atorvastatin has a long half-life (~14 hours). It can be taken at any time of day, with or without food. Consistency matters more than timing — pick a time that fits your routine and stick to it.
Common side effects
Muscle aches (myalgia) are reported by 5–10% of patients in clinical practice, though this is partly nocebo effect — rates in blinded trials are much lower. True statin myopathy (elevated CK) is uncommon. Rarely, rhabdomyolysis (severe muscle breakdown) occurs — risk increases with high doses or interaction with certain drugs (fibrates, ciclosporin, some antifungals).
Liver monitoring
Atorvastatin can cause transient, asymptomatic liver enzyme rises. Routine monitoring in otherwise healthy patients is no longer recommended by most guidelines, but baseline LFTs before starting are common practice. Significant hepatotoxicity is rare.
Drug interactions to know
Strong CYP3A4 inhibitors (clarithromycin, itraconazole, some HIV protease inhibitors) can increase atorvastatin levels significantly — dose reduction or temporary suspension may be needed. Grapefruit juice also inhibits CYP3A4 — avoid large quantities.