Neurontin etc. (gabapentin) is a second-generation anticonvulsant medication (U.S. FDA 1993), approved for the treatment of epileptic seizures. Anticonvulsants are believed to work in part by by enhancing the actions of a natural brain chemical, GABA (gamma-aminobutyric acid).
GABA is a neurotransmitter, a chemical that carries messages between brain nerve cells. GABA inhibits the transmission of nerve signals, thereby reducing nervous excitation.
Like other anticonvulsant medications, gabapentin may be effective in treating conditions as varied as mood and anxiety disorders, sleep disorders, preventing migraine headaches and reducing chronic, neuropathic pain. Sleepiness, dizziness, and problems with coordination are the most commonly reported side effects.