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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.
2 If i stop simvastatin for a few weeks to see if it could be affecting my blood sugar level, should there be any problem? Dr. David Sneid Dr. Sneid. 1 doctor agreed: Minor glucose effect: Simvastatin can have a minor effect on increasing blood sugar, but it is easy to correct with your diabetes medication. Allowing your cholesterol to increase in the mean time is a mistake. The longer you allow it to be elevated, the more damage it can do. 3 Have RX for Simvastatin.