As per your history, your son is probably suffering from
Allergic rhinitis & your doctor has appropriately prescribed Monticope (
Montelukast + Levocetrizine) for him.
Duration of this treatment is usually 6-8 weeks, then doctor should re-evaluate the response and treat accordingly. An alternative to this treatment is inhalational corticosteroid by inhaler. People are sometimes afraid of inhalers, but no need to worry, it is only a
targeted drug delivery method to reduce side effects of drugs.
Your next query was what food to avoid. Generally brinjal, egg, prawn, some types of fish, some variety of nuts, milk, soya are common causes of
food allergies. However, to know for sure, I would recommend for Allergen Specific IgE Testing for your child.