What are the good ways to treat winter cough and chronic cough caused by allergies

Morning expert outpatient service, to a patient, would require an ct, ct, I asked him why he want it originally he cough for more than a month, back and middle also eat a lot of drugs, cephalosporins, azithromycin chronic cough caused by allergies, luo erythromycin, and several kinds of cough medicine, it is good to eat a bit, a withdrawal is cough again in a few days, phlegmy much, no fever, go on to ask the history, it is during