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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.
Of note, her simvastatin dose had been increased from. 10 mg to 20 mg each night 9 months prior to presentation. At presentation, the patient described waking up in the middle of almost each night, with facial, tongue, and lip swelling.