Tramadol
"Started taking Tramadol (50/mg) for a bulging disc that was discovered after an X-ray and MRI in 2011.  I didn't take 50 mg/day consistently until November. Tramadol worked extremely well for my back pain and elevated my mood quite a bit.  (Always a great thing for the husband and kids.)  I stopped taking it altogether 3 days ago because I'm convinced it lowered my libido and it was making me gain a few pounds.  I'm not a big person at 5'2" and 112lbs.  Someone had told me that it does aid in weight gain. The side effects of withdrawal are true and include (for me anyway): body aches, irritability, mood swings, sweating and dizziness. Unfortunately, my back pain has returned."