Vigabatrin (CAS 60643-86-9; γ-vinyl-GABA) is a specialty chemical and synthetic analogue of the neurotransmitter GABA. It acts as an irreversible inhibitor of GABA transaminase (GABA-T), increasing GABA levels in the brain. Offered at high purity (e.g., 98%), it is used in pharmaceutical research, drug development, and as an active pharmaceutical ingredient (API) for treating epilepsy, particularly infantile spasms (West syndrome) in infants and refractory complex partial seizures in adults. Clinical use requires close monitoring due to risks like permanent peripheral vision loss; regular eye exams are mandatory.