The cough caused by postnasal drip syndrome is mainly due to nasal secretions that enter the pharyngeal cavity through the postnasal tract and irritate the pharyngeal mucosa, so its treatment should be to reduce nasal secretions and treat the inflammation of the nasal cavity. If it is caused by chronic rhinitis or sinusitis, it can be considered to use nose spray medications, such as co-solvadex or endosolvadex, together with rhinitis medication Canglizi rhinitis drops or rhinitis capsules. If it is caused by allergic rhinitis, it is possible to take oral antihistamine anti-allergy drugs, such as Stelastine hydrochloride tablets and Cetirizine hydrochloride, along with nasal spray drugs. If the inflammation is caused by adenoids, oral amoxicillin capsules can be taken together with nebulized inhalation treatment during the inflammation process.