PENTOBARBITAL By N., Pam M.S. - April 7, 2013 noun. a short-to intermediate-acting barbiturate previously in common utilization as a sedative and hypnotic drug. American brand name: Nembutal. PENTOBARBITAL: "The doctor prescribed Pentobarbital to treat Beth's ongoing seizures." Related Psychology Terms PHENOBARBITAL BUTABARBITAL TEMAZEPAM ZALCPLON PARALDEHYDE METHAQUALONE BARBITURATES TRIAZOLAM SEDATIVE, HYPNOTIC, OR ANXIOLYTIC DEPENDENCE AMOBARBITAL Cite this page: N., Pam M.S., "PENTOBARBITAL," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/pentobarbital/ (accessed June 20, 2019).