Someone mentioned the their doctor resisting the idea of Zocor causing muscle cramps. Here's why they resist. Believe it or not, and according to a senior sales rep from a major pharmiceutical company whom I know, most physicians receive compensation for prescribing certain medications to patients. If you look for this practice on websites in the United Kingdom for example, it is clearly a well documented, open practice there, however this practice is frowned upon by many in the U.S. so it is not formally acknowledged. I too recently quit years of Zocor therapy realizing that it was causing fatigue.