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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.
In addition to atorvastatin and simvastatin, other medications in the same group include fluvastatin, pravastatin and rosuvastatin. Antidepressants, birth control pills, and blood pressure or heart medication are examples of drugs that can affect the way atorvastatin works.