Researchers at University of California, San Diego state that taking stronger statins could come with an increased frequency of muscle side effects.

AstraZeneca’s Crestor, known generically as rosuvastatin, was found to cause the most frequent number of muscle problems followed by Lipitor (atorvastatin), Zocor (simvastatin), Pravachol (pravastatin) and Mevacor (lovastatin).
“Incorporating all muscle categories, rates for atorvastatin, simvastatin, pravastatin, and lovastatin were, respectively, 55 percent, 26 percent, 17 percent, and 7.5 percent as high, as rosuvastatin, approximately tracking per milligram potency”, the researchers wrote in their report.
Source-Medindia