I am 52 years old. I started taking 40mg of Zocor when I was 47. After 3 months the muscle pain and weakness became so bad that I could not function. My Dr. told me to stop the Zocor and within 3 days that pain and weakness was gone. Within 4 months it started coming back. First it was once a month for about a week. Then twice a month and the last year it has been constant. I have also developed major depression and memory loss. It has ruined my life.