Patienter, som får krampestillende lægemidler, der hovedsageligt metaboliseres i leveren, som fx phenytoin, carbamazepin og phenobarbital, kan have brug for periodisk monitorering af plasmaniveauer.
Patients who are receiving concomitant anticonvulsant medicinal products primarily metabolised by the liver, such as phenytoin, carbamazepine and phenobarbital, may require periodic monitoring of plasma levels.