welcome to health care magic,,
) is an anti allergic tablet,,it gives only temporary relief but not decreases the problem(asthma
)you have.....you need to start a beta agonist for that,,
no need to take antibiotic course,,,
consult chest physician,he/she will conduct pulmonary function tests and they will decide which beta agonist is suitable to you..dont get delay by taking cetrizine only..
hope you will follow my suggestion..have a speedy recovery