Which short-acting barbiturate may be used to control seizures in progress that are refractory to diazepam, as an intravenous anesthetic, and as a euthanasia agent?

Which short-acting barbiturate may be used to control seizures in progress that are refractory to diazepam, as an intravenous anesthetic, and as a euthanasia agent?

• A. Thiopental
• B. Phenobarbital
• C. Methohexital
• D. Pentobarbital

Answer: (D)

When seizures are active and not responding to diazepam, doctors escalate to IV barbiturates that can rapidly suppress brain activity. The drug that best fits all three roles—rapid intravenous antiseizure effect in ongoing status epilepticus, use as an IV anesthetic, and acceptance as a euthanasia agent—is pentobarbital. It enhances GABA-A receptor activity, increasing chloride influx and producing strong neuronal inhibition. In status epilepticus, pentobarbital is used to induce a controlled coma and stop seizures when benzodiazepines fail. As an anesthetic, it provides fast loss of consciousness with IV administration. For euthanasia, its predictable CNS depression leads to rapid cessation of breathing and circulation, making it a standard choice in veterinary practice. Other barbiturates like thiopental and methohexital are mainly ultrashort-acting induction agents for anesthesia and aren’t standard euthanasia drugs, while phenobarbital is long-acting and used for chronic seizure control rather than acute treatment or euthanasia.

When seizures are active and not responding to diazepam, doctors escalate to IV barbiturates that can rapidly suppress brain activity. The drug that best fits all three roles—rapid intravenous antiseizure effect in ongoing status epilepticus, use as an IV anesthetic, and acceptance as a euthanasia agent—is pentobarbital. It enhances GABA-A receptor activity, increasing chloride influx and producing strong neuronal inhibition. In status epilepticus, pentobarbital is used to induce a controlled coma and stop seizures when benzodiazepines fail. As an anesthetic, it provides fast loss of consciousness with IV administration. For euthanasia, its predictable CNS depression leads to rapid cessation of breathing and circulation, making it a standard choice in veterinary practice. Other barbiturates like thiopental and methohexital are mainly ultrashort-acting induction agents for anesthesia and aren’t standard euthanasia drugs, while phenobarbital is long-acting and used for chronic seizure control rather than acute treatment or euthanasia.