You should always speak with a doctor to make sure that gabapentin is right for you. Possible side effects include:Drowsiness and dizzinessLoss of coordinationBlurred/double visionUnusual eye movementsShaking or tremorsYou may also experience depression, suicidal thoughts/attempts, or other mental/mood problems. It is advised that you tell your doctor right away if you experience swelling of the hands, ankles or feet as well as slow/shallow breathing.