Pentobarbital is a short-acting barbiturate typically used as a sedative, a preanesthetic, and to control convulsions in emergencies. It can also be used for short-term treatment of insomnia but has been largely replaced by the benzodiazepine family of drugs. Wikipedia
Routes of administration: By mouth, IV, IM, rectal; also intraperitoneal & intracardiac (for animal euthanasia)
Metabolism: Liver
Protein binding: 20–45%
AHFS/Drugs.com: Monograph
ATC code: N05CA01 (WHO) QN51AA01 (WHO)
Bioavailability: 70–90% (oral); 90% (rectal)
Elimination half-life: 15–48 hours

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