What are the side effects of simvastatin does it really help lower cholesterol?

Side effects and Yes. The commonest side effects are muscle pain and damage. Rarely rhabdomyolysis, lysis if muscle cells may occur and is a serious issue. Other side effects include liver damage. Gastro-intestinal disorders like constipation, diarrhea, skin rashes, precipitation of diabetes mellitus and neurologic problems like memory loss. Yes, it does help in lowering cholesterol.