I have been suffering from severe back pain for about 3 years now, and have been to every kind of specialist there is, and have been through countless surgeries, Phy. therapy, etc. but have had no success. So I started out on Vicodin, then Loracet, then I was on Oxycodone for over a year. The withdrawls from not having Oxycodone were horrible!! Not to mention the pain effects from the drug didn't last up to the 4 hour mark. So I tried Tramadol which has been working great without any side effects! But for the past couple of days I've been trying Ultracet, I don't like how it makes me feel at all!! It makes me feel really "out of it". So if any of you haven't tried Tramadol yet, I really suggest it. It will take away the pain, and with NO SIDE EFFECTS!! Good Luck to you and take care!