The symptoms of dyspnea caused by phlegm blocking the airway should be treated with comprehensive measures to remove the phlegm clots and relieve the symptoms of dyspnea. You can choose to take phlegm-dissolving drugs, such as carboxymesterol oral solution, amiloride syrup and myrtle oil to dilute the phlegm, which can promote the discharge of phlegm through coughing. You can also choose to use chymotrypsin and ambroxol for nebulized inhalation treatment. If the phlegm is more sputum and the sputum clots are not easy to cough out, you can also choose to use aspirator to suck out the sputum due to pathogenic infections, such as bacteria you can choose antibiotics penicillin, amoxicillin, cefuroxime, etc.