Simvastatin
"Took simvastatin only once and had a bad case of vertigo within 30 minutes of going to sleep.  The next day I felt OK for the most part, but that night I was playing drums in my band and had to stop after 40 minutes (we normally practice an hour and a half or more) because I was so exhausted.  The rest of the night I felt like my whole body was being squeezed, and my muscles were really weak.  I woke up 3 times during the night with my heart racing and feeling like I was going to pass out. I drank 1 liter of water in 2 hours, and finally fell asleep at 4AM. If I hadn't improved after 4AM I would have gone to the hospital.  The next day I felt almost 100%, but my left arm ached all day. And this was just taking it once. It's not for me."