PHENYTOIN - DILANTIN ® COMMON USES: Phenytoin is used to treat various types of convulsions and seizures. Phenytoin acts on the brain and nervous system in the treatment of epilepsy. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. 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. Talk to your doctor about the possible risks of using this drug for your condition. Dietary Instructions Phenytoin may cause an upset stomach. Take phenytoin with food. If you are on enteral feeding, it is best to take phenytoin 2 hours before or after the enteral feeding. Drink plenty of water when taking this medicine. Storage Conditions: Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature, away from excess heat and moisture (not in the bathroom). Protect the extended-release capsules and liquid from light. Do not freeze the liquid. Throw away any medication that is outdated or no longer needed.