How do lipitor and crestor's side effects typically compare?

Short answer: Lipitor (atorvastatin) and Crestor (rosuvastatin) have very similar overall side-effect profiles because they’re both statins. Most people tolerate them similarly. Differences mainly come from dosing, kidney involvement, and drug interactions.

What they commonly share
- Muscle symptoms: mild muscle aches or weakness (myalgia) are the most common complaint.
- Liver enzymes: occasional small increases in ALT/AST on labs.
- Rare but serious: risk of myopathy or rhabdomyolysis (especially at higher doses or with certain drug interactions), and rare liver injury.
- Other possible but less common effects: headache, upset stomach, nausea, or constipation.
- Long-term risk: a small increase in the chance of developing higher blood sugar or type 2 diabetes with statin therapy, generally modest.

Key differences in practice
- How they’re processed:
- Atorvastatin (Lipitor) is mainly metabolized by CYP3A4 in the liver, so interactions with drugs that inhibit or induce CYP3A4 (and with grapefruit juice) can raise statin levels and the risk of side effects.
- Rosuvastatin (Crestor) is less dependent on CYP enzymes and is partially excreted by the kidneys. It has fewer CYP interactions but does require caution in kidney disease and dose adjustments in renal impairment.
- Dosing and potency:
- Rosuvastatin is more potent per mg for lowering LDL cholesterol. Higher-potency dosing can raise the chances of muscle-related side effects if used at high doses or with interactions.
- Kidney considerations:
- Because rosuvastatin is partly cleared by the kidneys, people with kidney disease may need dose adjustments and may have a different side-effect risk profile than with atorvastatin.
- Proteinuria/urinary changes:
- Very rare reports of protein in urine (proteinuria) with high-dose rosuvastatin; largely reversible when the dose is adjusted or stopped.

Bottom line
- For most people, the side-effect profiles are very similar. The choice between them is usually guided by:
- Other medications (to avoid interactions),
- Kidney function (rosuvastatin requires dose adjustment in CKD),
- How much LDL lowering you need (rosuvastatin can achieve strong LDL reductions at lower mg doses).

If you’re experiencing muscle pains, dark urine, yellowing of the skin/eyes, or unusually weak muscles, contact your clinician promptly. They may check your CK levels and liver enzymes and may adjust the dose or switch to a different statin.