I started Zocar 3 years ago. Since then I have had (on a 1-10 pain scale) pain in my upper hamstrings (deep muscle pain in the lower buttocks or upper hamstrings). The pain is throbbing at a 1-2 level all the time. Sometimes it goes up to a 6-7. Overtime it had slowly exhausted me. I have gained wait due to less activity. I have visited multiply doctors with no diagnosis. I just found out about the side effects of Zocar. I am getting off. I had an MRI and multiple blood test yesterday. I will update this site in 30 -60 days to see if I have improvement in reduction of muscle pain.