You should prevent your child from cold breeze and feed in head up position.
put normal saline nose drops in both the nostrils two times a day.
Medicines are quite ok you need not give any other medicines.
The best way is prevention from the dust and cold air ,so that the allergic reaction
If required you can give azithromycin
antibiotic , i suppose he has atypical infection
in chest or atypical pneumonia
,. Azithromycin is good alternative..but do consult your doctor as without examination it is very difficult for me to comment .