I took Zocor (40mg) for three weeks. The first week was fine. During the 2nd week strange things started to happen. I woke up un the morning with aching legs. Woke up 5-6 times a night. Lost muscle strength and in the 3rd week had knee joints and shoulder joints just seize on me !!1. I train 5 days a week with a trainer and during the 2nd week was puffing up the smallest of inclines.My doctor took me off the medication and its been 5 days and the effects have only slightly improved