I dont think so. Although it can't hurt you. In my experience, medical schools both allopathic and osteopathic would rather see some hard science courses post-bacc, assuming that your grades are border line. Often times the course work in masters programs is too easy and therfore does not show your ability to handle the huge amount of difficult science courses you will be required to pass in medical school. Also, they like to see a lot of credits, say 12 to 15 credits or so at a time.
Hope this helps.