Gabapentin Oral belongs to the class of Anticonvulsants. This antiepileptic drug is safe as long as you take it according to the physician’s guidance. Misuse of Gabapentin Oral causes some serious side effects. Common side effects of Gabapentin Oral - Ataxia i.e. loss of co-ordination, presented with stumbling and falling - Fatigue and exhaustion - Drowsiness - Nystagmus i.e. uncontrolled abnormal eye movements - Dizziness - Weakness - Sleepiness - Fever - Visual disturbances - Peripheral edema - Xerostomia i.e. dry mouth - Difficulty in speaking - Diarrhea / Constipation Rare side effects of Gabapentin Oral - Suicidal thoughts and attempt - Violent and aggressive behavior - Insomnia - Jaundice-like signs i.e. yellowing of skin and eyes - Musculoskeletal pain - Rash - Hives - Swelling of lips, face, tongue, throat and eyes