There are many kinds of drugs to relieve cough and resolve phlegm in adults, clinically cough and phlegm belong to two different manifestations, so the treatment is divided into cough medicine and phlegm medicine, in addition, some of the Chinese patent medicine preparations can play the role of cough and phlegm. Cough suppressants include central cough suppressants (e.g. codeine, pentoxyverine, loperamide, etc.) and peripheral cough suppressants (e.g. benzonate, noscapine, phenprocoumon, etc.), the choice of which should be made under the guidance of a physician. Drugs for phlegm production include drugs to promote mucus secretion (e.g. ammonium chloride, potassium iodide, etc.), and drugs to dissolve mucus and phlegm (e.g. chymotrypsin, acetylcysteine, aminoglutethimide, etc.), which are suitable for different shapes of sputum and different quantities of sputum, and should be chosen by a physician after assessing the condition. All of the above drugs can be applied to adults, the specific use of drugs, should be under the guidance of a physician or pharmacist, do not self-medication.