Buy Nembutal Sodium Online. Pentobarbital is in a group of drugs called barbiturates (bar-BIT-chur-ates) .Nembutal functions are sedative, hypnotic for short term, preanesthetic and control of convulsions in emergencies. It is also used as a veterinary anesthetic agent. This medication also has an application in reducing intracranial pressure in Reye’s syndrome, traumatic brain injury and induction of coma in cerebral ischemia patients.