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occurs due to abnormal electrical discharge in brain. Usual guidelines advocate that any single episode of seizure should not be ignored. Neurologists advise the patients to take medicines for seizure for at least 3 years after last seizure. As you have been on Phenatoin and Carbamazepine
for about 20 years and if you didn't have any episode for last 3 years then you can think of discontinuing the medicines. But don't stop them by your own, consult your neurologist and then take opinion.
Dr. Seikhoo Bishnoi, MD