Gabapentin is a prescription anticonvulsant and nerve pain medication commonly used to treat conditions such as epilepsy, postherpetic neuralgia, and neuropathic pain. It is also prescribed off-label for anxiety and restless legs syndrome. Gabapentin works by calming nerve activity in the brain, reducing seizure risk and easing nerve discomfort. It must be taken consistently as prescribed, and abrupt discontinuation should be avoided.