Pentobarbital Euthanasia Agents

Pentobarbital-based euthanasia solutions are utilized for the rapid, humane euthanasia of animals not intended for food purposes. **Key Clinical Points:** * **Preferred Method:** Intravenous (IV) injection of a barbituric acid derivative is the gold standard and preferred method for euthanasia in dogs, cats, other small animals, and horses according to AVMA guidelines. * **Alternative Routes:** Intraperitoneal (IP) injection may be used when IV access is distressful or dangerous. Intracardiac (IC) injection **must only be used** if the animal is heavily sedated, unconscious, or anesthetized. * **Formulations:** Some products combine pentobarbital with phenytoin (e.g., Beuthanasia-D Special) to provide added cardiac depressant effects and to alter the regulatory scheduling from a Class-II to a Class-III controlled substance. > **Note:** Carcasses euthanized with pentobarbital may be rejected by renderers due to tissue residues, and pose a secondary toxicity risk to scavenging wildlife.

กลไกการออกฤทธิ์: **Pentobarbital** is a short-acting barbiturate that acts as a positive allosteric modulator at **GABA_A receptors**, enhancing the inhibitory effects of GABA. * At the massive doses used for euthanasia, it causes profound, irreversible central nervous system (CNS) depression. * This leads to severe depression of the **medullary respiratory and vasomotor centers** → apnea → hypoxia → cardiac arrest. **Phenytoin** (when included) is an antiarrhythmic/anticonvulsant that, at toxic doses, causes direct myocardial depression and cardiovascular collapse, ensuring rapid cessation of cardiac activity.

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