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This is typical of Bronchial Asthma
A battery of tests may detect some allergy
causing agents - not always very useful.
Rescue medicines are given in this stage.
Once the acute stage is tided over, he has to switch over to prophylaxis.
There are several classes of drugs - Steroids
/ leukotriene inhibitors / anti-cholenergics / theophylline
and so on.
Your Pulmonologist will be the one to assess and advise, according to the evaluation.
Wishing speedy recovery