Gabapentin is an FDA-approved Prescription medicine used to treat Nerve pain, Partial seizure, Restless leg syndrome, and anxiety. It has different variants such as Gabapentin 100 mg, 300 mg, 400 mg, 600 mg, 800 mg, 1200 mg, 1600 mg. It blocks pain signals in the brain. It is helpful for both adults and children. You can take gabapentin at night before sleeping for better effect. Gabapentin is one of the most powerful painkillers. It has some severe and mild effects. clumsiness, unsteadiness, dizziness, drowsiness, and sleepiness are the common side effects of gabapentin.