Vicodin
"I take Vicodin for menstrual cramps.  It is quite effective in eliminating the pain, but it does make me very sleepy and slightly out of touch with reality.  I found that caffeine counters this effect, but I haven't asked my doctor yet if it is okay to take caffeine with Vicodin (I read the warning label twice and didn't find anything mentioned there).  I haven't noticed withdrawal symptoms, but I do use a minimum amount and am not prone to addiction in general."