Side Effects Gabapentin Dogs. It’s thought to amplify their effect on pain management despite potential side effects. Increased appetite and mild weight gain have been reported.
Gabapentin and benadryl are ok to give at the same time, however you should consult with your vet as your vet knows your dog’s history and can assess the necessity/impact of benadryl on your dog. Ataxia or incoordination (being wobbly) diarrhea. These side effects can be minimized by starting off with a small dose and gradually increasing to the desired amount.