Does gabapentin cause weight gain?

Weight gain is a rare side effect of gabapentin, but weight loss is also a reported side effect. The most common side effects reported in more than 10 percent of patients treated with gabapentin involve the nervous system. These side effects include somnolence, dizziness, ataxia, headache and fatigue, explains Drugs.com

Gabapentin is a medication used to treat epilepsy, neuropathic pain caused by shingles or herpes, and restless leg syndrome. Gabapentin may potentiate the side effects of drugs that cause sleepiness and slow down breathing. Check with a doctor before taking it with hydrocodone, morphine or naproxen because of potential interactions, according to Drugs.com.