Suggest Dosage Of Budecort Inhaler For A 4 Year Old

Does there is any specific doses when one is going to stop the inhaher? My son is 4 years and 5 month old. Doctor has given budecort inhaler 100 to be given 2 puff twice a day and Criz-M 5ml once. I am giving it last 5 months. and Doctor checked him and suggested to stop this inhaler step wise. That is for fifteen days twice in the morning only and after that for 15 days only Criz-M. then to stop both. I want to know is there any specific doses rules to stop the inhaler. or it depends on the condition of the patient. that is why we should not stopping this process more slowly. that is 2 puff once for 15 days and then 1 puff once for 7 days? Please let me know. Thanks.