Thank you for posting your query.
There is no clear cut data regarding the safety of mountain dew in a child with epilepsy
However, a little bit of it should not be a cause of concern. I would suggest he avoid drinking a lot of mountain dew.
Also, it is important to eat food on time and avoid fasting. Adequate sleep of 7-8 hours per night is also useful in preventing seizure
Dr Sudhir Kumar MD DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad