What is the primary purpose of phenytoin in this case?

• A. To prevent seizure activity.
• B. To cure epilepsy.
• C. To treat infection.
• D. To reduce blood pressure.

Answer: (A)

Phenytoin is an antiseizure medication whose main role is to prevent seizure activity by stabilizing neuronal membranes. It blocks voltage-gated sodium channels, reducing neuronal excitability and preventing the rapid firing that leads to seizures. Because of this, its primary purpose is prophylaxis and maintenance to lower the chance of seizures recurring, not to cure epilepsy. It does not treat infections or affect blood pressure. While monitoring and potential side effects are important in practice, the central idea here is preventing seizures from occurring.