My general practitioner prescribed 20 mg Pravastatin daily. A couple of years later a Cardiologist prescribe 20 mg Simvastatin daily and told me to stop the Pravastin, which I did. According to a drug dictionary they are the same drug, just different manufacturer. Friends that are taking other Statin drugs tell me that Simvastin is worse for my liver and muscles and that it will effect my memory. I am age 75.