Thank you for your query.
The recommended maximum dose of the drug is 60 mg./kg/day. As I do not have the weight of your son it is difficult to say whether the dose is excessive.
The drug gives side effects of mania
and it shall be better if you discuss the issue with the treating doctor who may like to stop the medicine or change the dosage.
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.
Rajiv K Khandelwal