Thank you for your query.
Does anyone in the family have upper respiratory tract
infection from where your son has contracted any infection. If the answer is yes the it shall be better to switch to Bricarex
1.5 ml. three times a day along with steam inhalation. In case there is no history of any infection in the family members then just steam inhalation should suffice.
I hope I have answered your query to your satisfaction.
Wishing your son all the best...