ANSWER:

Seizures are the result of either an imbalance of the electrical currents and waves of the brain which can be medically treated with the grace of Allah or due to possession of Jinn that can be cured with the grace of Allah through ruyqa

You need to perform ruqya on him multiple times per day and night as found on my website in sha Allah. 

QUESTION: We are seeking advice for my 13 year old son. He started having seizures in January and began taking medication after his third incident.The medication has not helped as he has had about one seizure per month. Do you have any guidance or advice on how to deal with this Islamically? Are there any duas or something we can do to remove negative energy or seek Allah’s perfect shifa?