I have been on the gabapentin for 3 months and I am now on 1800mg at bedtime. I think it is starting to control the migraines although I am on another controller , Depakote that I have been on for years but was not working by itself. In combo, though it may be starting to work. I tried to call my neurologist today but he was out of town. I am a physician as well but a developmental pediatrician. When I read that it could cause delayed ejaculation, I was relieved since I already have ED and take cialis for that but not usually delayed ejaculation.