One drug (phenytoin) in the treatment of epilepsy.

Thirty-one, previously untreated, adult outpatients with idiopathic or focal grand-mal and/or focal minor seizures were treated initially with phenytoin. Serum-phenytoin concentrations were monitored to achieve an optimum range of 10-20 mug/ml if necessary. With a mean duration of follow-up of 14-7 months, only three (10%) patients have required the addition of a second drug, although without the guidance of serum concentrations sixteen (54%) might have been treated with a further drug. In the optimum serum-phenytoin range only 1 grand-mal attack occurred in this series, compared with a mean pre-treatment grand-mal seizure-rate of 1-1/month. Serum phenytoin declined slowly in fourteen (45%) patients. These observations suggest that many epileptic patients could be satisfactorily treated with one drug instead of the polypharmacy which they usually receive.