You should not receive this medicine if you have had an allergic reaction to phenytoin or fosphenytoin. You should also not receive this medicine if you have certain heart problems. Ask your doctor what these heart problems are, and if you have them.
Your doctor will prescribe your exact dose and tell you how often it should be given. This medicine is given through a needle placed in one of your veins. It may also be given as a shot into one of your muscles.
A nurse or other trained health professional will give you this medicine.