Hello, thanks for writing to HCM, I have read your question, sneezing and nasal drip could be symptoms for common cold or an allergic reaction, since you said your child is four years old the children at this age are usually prone to such problems since the immunity is just building up, since you said that you have already shown to a doctor I think the medication they gave would work well ahead and eventually your son would build build up immunity, I suggest you to continue using the medicine for three days and see that if there is any reduction in the symptoms, if not I suggest you to consult a general physician nearby and state all the medical history for further medication. Wishing your son a good health, Dr K Sanga Reddy