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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.
Frequency not reported: Tumor growth, liver, thyroid, lung adenomas, carcinomas. It is possible that some side effects of simvastatin may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.