Hi Kitty and Welcome to NT.
Here's a link to some information about Gabapentin or Neurontin. A lot of people with MS take it for neuropathic pain.
http://www.nlm.nih.gov/medlineplus/d...r/a694007.html
It's number one side effect is drowsiness and I do believe that it takes some time to get used to it. Some people are more med sensitive than others so it may take you a bit longer to get used to the dosage.
I don't happen to take that particular med for my pain as I need to function during the day. I am one of those med sensitive people.
Hopefully someone else will jump in here and help you with some more information.