Runny nose is a common nasal symptom that stimulates increased secretion activity of the glands in the nasal cavity after a certain intensity of stimulation in the nasal cavity. As a result, the secretion increases and the symptoms of runny nose appear. The main drugs to improve the symptoms of runny nose include the following: i. Antihistamines, such as cetirizine, loratadine, etc. Second, glucocorticoids, including budesonide and fluticasone, etc. Third, anticholinergic drugs, such as ipratropium bromide. Four, nasal decongestants, commonly used drugs are ephedrine nasal drops, hydroxymetazoline, serozoline, etc. Fifth, there are also chromones, such as sodium cromoglycate. Sixth, there are also leukotriene receptor antagonists, such as montelukast sodium. In terms of the action time of drugs, leukotriene receptor antagonists work the most and decongestants work the fastest, but decongestants are prohibited for children under two years old and cannot be used for more than one week. Therefore, the cause of runny nose should be specified and different drugs should be chosen to improve the symptoms for the cause of gas.