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in neonates under 5 years of age is usually benign condition and not worrisome. It is good to know that there are no more seizures after tegrital use.
Now that there are no seizures for more than 6 months and EEG is normal, medication can be stopped as it is now done. A few clinicians though believe in continuing it for a year, however as your child is young and chronic use is associated with side effects, I agree with your doctor and it is the right decision.
Do not worry. He should be fine.
Hope this answers your query.