The best amount is the amount that completely controls seizures without causing troublesome side effects. It depends on many factors, which are different for every individual. Follow the doctor's directions. Call if you have any questions.

To avoid unwanted side effects, the doctor will prescribe a low dose to start and increase it gradually until seizures are controlled. Most adults do well with 300 to 500 milligrams per day. If Phenytek is used, they can take one or two capsules once a day. If they use other forms of the same medicine, phenytoin, they often need to take more than one dose every day. Seniors usually need less.

Children (until they reach their teens) require a higher dose relative to their weight. If they need at least 200 milligrams per day and are able to swallow the capsules, they can use Phenytek once a day. They usually need to take other types of phenytoin at least twice a day.

No one should stop taking Phenytek or change the amount they take without talking to the doctor first. Stopping any seizure medicine all at once can cause a problem that may be life-threatening.

Don't use more Phenytek than the doctor prescribes. If a little extra (such as one extra capsule) is taken by accident, call the doctor for advice. For a larger overdose, call a poison control center or emergency room right away unless you have special instructions from the doctor.