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Common simvastatin side effects may include: 1  headache; 2  constipation, nausea, stomach pain; or. 3  cold symptoms such as stuffy nose, sneezing, sore throat.
Many people using this medication do not have serious side effects. A very small number of people taking rosuvastatin may have mild memory problems or confusion. If these rare effects occur, talk to your doctor. Rarely, statins may cause or worsen diabetes.