Statins are the most prescribed drug class in the world, and two of them dominate: atorvastatin (the generic of Lipitor, once the best-selling drug in pharmaceutical history) and rosuvastatin (the generic of Crestor). If your doctor has said the word “statin,” odds are high you’ll be choosing between these two. Here’s how they actually differ — in potency, interactions, side effects and price.
Potency: rosuvastatin wins per milligram
Rosuvastatin is the most potent widely used statin. As a rule of thumb, rosuvastatin 10mg lowers LDL (“bad”) cholesterol roughly as much as atorvastatin 20mg — a doubling relationship that holds approximately across the dose range. At maximum doses (rosuvastatin 40mg, atorvastatin 80mg), both deliver “high-intensity” therapy: LDL reductions in the region of 50–60%. Potency per milligram matters less than it sounds — what matters is reaching your LDL target, and both drugs can get most patients there. But it explains why rosuvastatin doses look smaller on the label.
Drug interactions: rosuvastatin is simpler
Atorvastatin is metabolised by the liver enzyme CYP3A4, which many other drugs inhibit — certain antibiotics, antifungals, some heart medications, and very large quantities of grapefruit juice can raise atorvastatin levels and with them the risk of muscle side effects. Rosuvastatin largely bypasses this pathway, making it the easier choice for patients on complex medication lists. If you take multiple medicines, this is often the deciding factor — bring your full list to your doctor or pharmacist.
Side effects: similar, and rarer than feared
The famous statin complaint is muscle ache. In blinded trials it affects only a small percentage of users more than placebo — far less than the folklore suggests — but it is real for some people. The two drugs are broadly comparable here; patients who get aches on one often do fine on the other, or on a lower dose, or on alternate-day dosing of long-acting rosuvastatin. Both can cause small, usually meaningless rises in liver enzymes and a slight increase in measured blood sugar — which is why treatment comes with occasional blood tests. Serious muscle injury (rhabdomyolysis) is rare. Report unexplained severe muscle pain or dark urine promptly.
Which one do doctors pick?
Atorvastatin is the default in many health systems simply because it went generic first and has the longest track record at high intensity. Rosuvastatin gets the nod when potency at a small dose, fewer interactions, or a previous bad experience with atorvastatin matter. Both have outcome trials showing reduced heart attacks and strokes — the choice between them is tailoring, not a quality ranking.
The price story
Brand-name Lipitor and Crestor once cost several dollars per tablet; the generics are now among the cheapest chronic medications anywhere. At International Pharmacy Mart, generic atorvastatin 20mg starts around $0.36 per tablet and generic rosuvastatin is similarly priced, with larger packs cutting the per-pill cost further and rosuvastatin/ezetimibe combinations available when a statin alone isn’t enough. See the full cholesterol category, and our explainer on why generics cost so much less if those prices look surprising. Statins are decade-scale medications — per-tablet pricing compounds enormously over time.
Frequently asked questions
Is rosuvastatin stronger?
Per milligram, yes — 10mg rosuvastatin ≈ 20mg atorvastatin. Both reach high-intensity LDL reduction at top doses.
Which has fewer side effects?
Broadly similar; rosuvastatin has fewer drug interactions. Patients who ache on one often tolerate the other.
Night-time dosing required?
No — both are long-acting; any consistent time works.
What do generics cost?
Roughly $0.30–$0.60 per tablet internationally, versus several dollars for the original brands.
Medical disclaimer: this article is for general information only and is not medical advice. Always consult your doctor or pharmacist about your medications, dosages and treatment options.