Not so much drowsiness, I have a bit of short term memory loss. I'm hoping to up my neurotriptiline to 100mg (50 x 2/day), and decrease the gabapentin. I've was in healthcare for 30 years, and with any drug, there are always side affects. When clinical trials are done on any one drug, each individual side affect is recorded. (So if one person in the whole world of that study got a headache, they have to record it). That's why drugs come with such a lengthy list of side effects, it does not mean they are common. You have to try different combinations to see what works for you.