⚠️ NCLEX pharmacology tip! Phenytoin is an anticonvulsant administered to prevent seizures. It does this by blocking high-frequency, repetitive action potentials. This medication can be used to treat all types of seizures, and can be given IV to treat status epilepticus when benzodiazepines are not enough! The NCLEX asks about this medication a lot because it has a narrow therapeutic index: 1️⃣0️⃣ - 2️⃣0️⃣ mcg/mL! Weekly labs are needed until the therapeutic level is reached, then will be monito