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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.
3 â¢ pravastatin * does not interact with amlodipine. 4 b) Reduce simvastatin to 20mg/day â¢ The interaction with amlodipine will lead to an increase in simvastatin exposure and a likely lipid lowering effect above what would be expected for 20mg/day.