Thank you for your query.
It would have been better if you had mentioned the active ingredient in Prescott. Presuming it to be a steroid
you have done the right thing in giving him a teaspoon. It shall be advisable to nebulize him for faster relief in the cough
. If your son is getting breathless then it shall be better to consult your doctor immediately.
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.
Rajiv K Khandelwal