I have been off ZOCOR for 3 years, but still suffering effects from the drug, which I took for 4 months only...20 mg. I lost all muscle strength in my arms, dark urine, leg cramps, continued after I stopped taking the drug. The first 6 mos of stiffness were terrible...then slow improvement. I still have difficulty going up stairs and standing up in spite of exercises for leg muscles. My arm strength is slowly coming back along with some energy. My doctor prescribed VIOXX and then BEXTRA to counteract Zocor effects. Amazing that I'm alive -- but refuse all drugs now.