My son is of 4 years and 5 months. Weight is 20 kg. For last 12 days he is suffering from cold, and he had taken already 60 ml of maxtra in 5 days twice daily and before it took cetiriz syrup for 5 days. While taking medicine he is ok but when we stop giving medicine his nose is running continuously. When he wakes up either in morning or afternoon he sneezes 10 to 20 times daily. So sir what to for?