I have been using this drug for almost 20 yrs, if a doc says he's going to take me off of it, this is what I tell him/her. My Mother said, "If it works, don't mess with it" I can't take most of the other drugs for arthritis,this works, and works great, now if you take more than the dose,yes you can get sleepy,amoung other things, I don't have nightmares,or dizzy but my husband did, gave him one to help with some pain and he got so dizzy,sleepy,etc, so with this and all drugs, some work, some don't, for me this is a life saver, and it does help with the mood, not sure if it's a "side effect" or just because the pain is gone but i'll take this any day, have arthritis in hips,lower back, neck, and hope that's all the places on me it decides to visit. If you haven't tried it, give it a try,you will know if it works or not, a cheap pain killer, Wal-Mart does Tramodol for $8.00 for 120 pills, I qualify to get the real deal Ultram free, check it out.Read More Read Less