I was prescribed Marinol by an M.D. for back pain. Didn't like it because for me, all it did was give me the munchies. The effects are so subtle. One good bong toke is much more satisfying.
It is interesting to note that the bottle of Marinol that he gave me was in the hundreds of dollars (for I think it was 40 pills) if I had to pay for it myself. Just underscores the politics of legal vs illegal substances and how much the insurance companies and the pharmaceutical companies profit from keeping weed illegal.