Common Side Effects of Crestor
Crestor (rosuvastatin), a statin used to lower cholesterol, commonly causes muscle pain (myalgia) in 2-5% of users, headache, nausea, and fatigue. These are usually mild and resolve after stopping the drug.[1][2]
Serious Risks and Rare Side Effects
Rhabdomyolysis, severe muscle breakdown leading to kidney damage, occurs in about 1 in 10,000 patients, more often at higher doses (40 mg) or with drug interactions like fibrates. Liver enzyme elevations happen in 0.5-2% of cases, and new-onset diabetes risk increases slightly (9% relative risk over 4 years in trials).[1][3] Memory issues or confusion are reported rarely but not proven causal.
Why Side Effects Differ from Other Statins
Crestor is more potent and hydrophilic than lipophilic statins like Lipitor (atorvastatin), potentially causing fewer central nervous system effects but higher muscle risk at equivalent doses. Switching statins often reduces issues; for example, patients intolerant to Lipitor tolerate Crestor 70-80% of the time.[2][4]
Factors Raising Side Effect Risk
Higher doses, age over 65, kidney/liver disease, hypothyroidism, or Asian ancestry increase myopathy risk up to 2-fold. Avoid grapefruit juice and check interactions with antibiotics or antifungals.[1][3]
Managing or Avoiding Side Effects
Start at low dose (5-10 mg), monitor CK levels if muscle pain occurs, and consider CoQ10 supplements (evidence mixed). About 10-15% of statin users need to switch or stop due to intolerance.[2][4]
When to See a Doctor
Seek immediate care for dark urine, severe muscle weakness, yellowing skin, or unexplained fatigue. FDA warns of these in black-box labeling for all statins.[3]
Sources:
[1] FDA Crestor Label
[2] Mayo Clinic Statins Overview
[3] Drugs.com Crestor Side Effects
[4] UpToDate Statin Intolerance