hello and welcome to HCM,
I am assuming that you are talking about junior lanazole.....this is an anti reflux or anti ulcer drug much similar to the pantoprazole
which is the recommended drug for any acute acidity like state in a child.
Since your doctor has already started on antibiotics and pain killers, these may cause reflux especially in kids; in all probability since your baby had not much relief, lanzoprazole would have been started.
do not worry, it is a safe drug and when your child improves do an ENT consult so that a proper and permanent treatment to his nose block can be done
Dr Sriram Nathan