Gabapentin
"I was having migraine headaches twice per week then gradually it became every day for 3 months. Midrin was no longer working. I was incapacitated. Yesterday, I was prescribed gabapentin 300mg twice per day. First day it took 1 1/2 hours to kick in then I fell asleep. When I woke 6 hours later I felt drunk and my coordination and walking ability were impaired as if drunk. I worried about falling. Yet for the first time in 3 months, my migraine was present but at a level "4" verses a pain level of constant "10".  An unexpected additional gain was that it helped my unresolved back pain of the neuropathic (burning) variety. I highly rate it except for side effects of in-coordination, slightly blurred vision and word finding problems."