Girls, we have cough and phlegm here. There's a wheeze. I give antibiotics…

Girls, we have cough and phlegm here. There's a wheeze. I give antibiotics as prescribed by the doctor. I do drainage massage, and I don't understand. Should she spit out phlegm or something like that? After the massage, nothing comes out (what else can be done? How to get rid of phlegm?)