The uses of PHETOIN include: Phenytoin is used to treat various types of convulsions and seizures. Phenytoin acts on the brain and nervous system in the treatment of epilepsy.
Phenytoin comes as a capsule, extended-release (long-acting) capsule, chewable tablet, and liquid to take by mouth. It usually is taken two or three times a day. However, the extended-release capsules may be taken only once a day, usually at bedtime. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take phenytoin exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Shake the liquid well before each use.
Do not open, crush, or chew the extended-release capsules; swallow them whole.
Continue to take phenytoin even if you feel well. Do not stop taking phenytoin without talking to your doctor, especially if you have taken large doses for a long time. Abruptly stopping the drug can cause seizures. Your doctor probably will decrease your dose gradually.
Phenytoin is also used to control arrhythmias (irregular heartbeat) and to treat migraine headaches and facial nerve pain.