The withdrawal of antiepileptic drugs in patients with non-epileptic seizures: safety considerations.

The majority of patients with psychogenic non-epileptic seizures (PNES) do not have epilepsy. There are a number of compelling reasons to take these patients off antiepileptic drugs (AEDs), including drug toxicity and teratogenicity, as well as possibly poorer outcome of PNES and increased risk of iatrogenic harm when patients present to emergency rooms on AEDs as emergencies. However, many patients with PNES who do not have epilepsy remain on AEDs postdiagnosis. Some studies do report patients taken off medication as an outcome measure, but with no assessment of the safety of withdrawal, or specification of the criteria for 'excluding' epilepsy. One study has assessed the safety of taking patients satisfying some simple criteria for the absence of an underlying epilepsy off AEDs, and has found the procedure to be safe, given appropriate postwithdrawal follow-up. Patients with PNES who do not have evidence of epilepsy should be referred to a centre with appropriate expertise in epilepsy diagnosis so that AEDs can be withdrawn in safe conditions.