<s>[INST] My son is of 4 years. He had seizure attack when he was 1 year old. He took Velporin syrup for 2 years. Then started taking Eptoin 100 from last 1 year. He is going to school from last 7-8 months but still he could not understand things like how to write counting or ABCD by himself. I want to know is there any possibility that its side effect of Eptoin or Valparin ? Any advoice will be very much appreciated. [/INST] Hi,Why he was changed from valparin to phenytoin? Any breakthrough seizure? How was his overall development? all milestones attained on time or any delay?Phenytoin is a very commonly used drug, and most of the children do well  without any significant effect on cognition or scholastic performance.Also, if he had only one episode of seizure, and remained seizure free for last 3 years, we can consider tapering and stopping the drug. But this depends on the cause of seizure and reports of EEG and brain imaging. Kindly discuss with his pediatrician / neurologist.Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Muhammed Aslam T. K., Pediatrician </s>