Thanks for posting on HCM,
Your son is suffering is suffering an upper respiratory tract
infection and it seems your doctor has already prescribed a combination of drugs that can help relieve your son. The delcon syrup contains Chlorpheniramine
Maleate 2 mg(antihistamine) Paracetamol
125 mg (analgesia/antipyretic
HCL 12.5 mg (decongestant) which will treat your son symptomatically. Generally URTI are caused by viruses or allergy and if the treatment does not subside the symptoms there is the likely possibility of bacteria being the cause of the affection. If the symptoms persist after about 2 days, please go back and meet your doctor. Keep the child warm and prepare him some hot soup or tea to drink.
Hope this helps