Avoid drinking alcohol while you are taking phenytoin. Alcohol use can increase your blood levels of phenytoin and may increase side effects. Daily alcohol use can decrease your blood levels of phenytoin, which can increase your risk of seizures.
Ask a doctor or pharmacist before using over-the-counter medicines such as cimetidine, omeprazole, St. John's wort, or vitamins and mineral supplements that contain folic acid.
Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired.
Avoid taking antacids at the same time you take phenytoin. Antacids can make it harder for your body to absorb the medication.
