Weight gain is a rare side effect of Neurontin, notes WebMD. Other rare side effects include depression, mood changes and loss of memory.
Neurontin is anti-epileptic medication, as stated by Drugs.com. It works by altering nerves and chemicals in the body to eliminate the risk of seizures. The medication is only available with a prescription and the dosage varies depending on the person. People with kidney disease or liver disease should not take the medication without consulting their doctor. The most common symptoms associated with Neurontin include dizziness, blurred vision and fluid retention in various parts of the body such as the feet.