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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 clinical trials, Norvasc has been associated with numerous rare side effects, which affect less than one percent of people. 1  These include, but are not limited to: 2  Muscle cramps. 3  Diarrhea, vomiting, and weight changes. 4  Abnormal vision. 5  Depression and anxiety. 6  Itchiness and rashes. 7  Difficulty breathing.