Adjunctive therapy in resistant epilepsy.

It is now established that the overall prognosis for epilepsy is good and that remission will occur in at least 75% of patients following adequate treatment with monotherapy. Patients who fail to respond to monotherapy, who are not suitable for surgery, and who continue to have frequent seizures may have to be considered for an alternative drug regimen. A review of the literature indicates that complete seizure control with adjunctive treatment is rare, but improved seizure control can be obtained in up to 40% of patients. In a study of clobazam as adjunctive treatment, 60% (N = 20) of our patients responded to treatment initially and 33% maintained an improvement over an 18-month period. In 31 patients who failed to respond to carbamazepine as monotherapy, primidone (N = 16) or valproate (N = 15) were prescribed as adjunctive treatment. One patient obtained complete freedom from seizures and 14 (45%) had a greater than 50% reduction in seizure frequency. Suggested indications for the use of additive treatment in epilepsy are discussed.