Gabapentin is a medication primarily used to treat nerve pain and seizures. It works by affecting the way nerves send messages to the brain, helping to reduce pain and prevent seizures in conditions like epilepsy and neuropathic pain. This drug is often prescribed for conditions such as fibromyalgia and restless legs syndrome as well. Gabapentin is usually taken in capsule or tablet form, and it may take some time to notice its full effects. Common side effects can include dizziness, fatigue, and drowsiness.