Tramadol is also known as Ultram, Ultracet, & Zydol. It's an analgesic pain reliever used in humans & (apparently) dogs, I know they use it in horses as well. It acts similar to codeine in the way it makes you feel.
Check this link out it might help. http://www.drugs.com/ultram.html
OH! BTW, if you are prone to seizures, liver or kidney problems, don't take it.
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