Gabapentin
"I was prescribed Gabapentin for horrible, 24/7 MS pain, 300 mg 3x a day at first. It did nothing for the pain, and I spent the entire month I was on it feeling like I was drunk or on a bad 60s type acid trip; I dizzy, staggering, confused, nauseated. My doctor said to give medications a fair chance to work and the side effects should only last a week or so. She increased the dose to 600mg 3x a day when I got no relief from the pain. After a month I couldn't stand the awful side effects any more and was still in pain so I just quit taking it."