I've been taking Zocor for years, then they switched me to Vytorin, which is the same drug with another one added to it. Once in a while some of my liver enzymes are mildly elevated, but I've never noticed a problem that I could readily attribute to either pill. I do remember that I'm supposed to watch for muscle aches, I think. Maybe I'll go read up on it again, just to be sure. Do talk to your doc about it, regardless.