Gabapentin is an anticonvulsant class of medication that is used as a painkiller. It helps to treat partial seizures, restless leg syndrome, and nerve pain. It works as a chemical messenger on your nerves and brain. Gabapentin can be used in adults and children aged 3 and older who have partial seizures. Gabapentin can be taken with or without food. Suddenly stopping taking medicine causes you serious problems. Heart attack Is the severe side effect of Gabapentin.