Phenobarbital is a long-acting barbiturate used to treat generalized tonic-clonic seizures and fever-induced convulsions, as well as the prevention of hyperbilirubinemia in neonates; it is no longer used as a sedative or hypnotic.

• A. To treat generalized tonic-clonic seizures and fever-induced convulsions
• B. As a sedative for sleep
• C. For anxiety
• D. For pain

Answer: (A)

Phenobarbital’s main clinical role today comes from its anticonvulsant action. It enhances GABA-A–mediated inhibition, which quiets neuronal activity and helps prevent and control seizures. This makes it effective for generalized tonic-clonic seizures and fever-induced convulsions, which is why that use is the best match for the statement. In newborns, it also has a role in reducing hyperbilirubinemia risk by inducing enzymes that help conjugate bilirubin. Its historical use as a sedative or hypnotic faded because of safety concerns, tolerance, and the availability of safer alternatives, so sedation is no longer a primary indication. It’s not used for anxiety or pain, which is why those options don’t fit the main therapeutic purpose.