"i was prescribed 1-2 of the 75mgs every 4-6 hours as needed for severe shoulder pain, due to rheumatoid arthritis and an undiagnosed muscle disorder (something similar to fibro, but not yet diagnosed officially). i took 1 pill and after about 45 mins, felt no relief, so i took another.  after about another 30-45mins, i started to feel really messed up in my head, fuzzy, dizzy, not too bothersome until i started having heart palpitations, very scary! i went to bed about 2 hours later and had major hallucinations (this has never happened to me on any other drug)  i have taken many pain killers, both narcotic and non-narcotic, so my experience is vast, and i have never encountered side effects like this. back to percs."