What medicine does dry cough take without phlegm? There are many reasons for dry cough without phlegm, usually including viral infection, bacterial infection and chronic cough. Different causes and treatment methods are different: 1, viral infection: pseudoephedrine hydrochloride and antihistamines mainly reduce the secretion of respiratory glands; 2, bacterial infection: antibiotics can be used, cough can be relieved by itself after infection, and cough-relieving drugs can be used when cough is serious; 3. Chronic cough: including cough variant asthma, upper airway cough syndrome, eosinophilic bronchitis, gastroesophageal reflux cough and taking angiotensin converting enzyme inhibitors, all of which have nothing to do with infection and need to be treated according to different causes.