"have 24/7 headache ( nonspecific ) from what i personally believe to be from anticholinergic pharmaceuticals. i am highly educated, so i have knowledge about these things. it rates on a scale of level 9 most of the time ( pain ). i had a pcp that put me on nine 600mg. gabapentins a day ( 5,400mgs. per day ). he obviously calculated wrong. on them for about 2 years. i was on heavy doses of other pharms for other reasons. got off of 9 meds over 10 month period. i was down to 3  600mg gabapentins. pain level 9. went up to. three  900mgs. gabs. pain now level 4. i don&#039;t know how long it will last. only side effects are tingling feet and constipation. i feel like it is a good med. because opiates destroyed me. 10 months opiate free."