Phlegm in the nasopharynx may be caused by inflammation of the nasal cavity, sinuses or nasopharynx, which can be treated with antibiotics, antiviral medicines, and medicines to dilute phlegm. 1. Antibiotics: If it is a bacterial infection, you can take amoxicillin, cefadroxil, erythromycin and other antibiotics to treat it. 2. Antiviral drugs: for common cold, you can take ribavirin; for influenza, you can take oseltamivir. 3. Mucus promoters: commonly used drugs are eucalyptus pinocchio enteric soft capsule, Oronema drops, etc., which can play a role in diluting phlegm and help phlegm discharge. Nasopharyngeal phlegm, you should first go to the hospital for examination, after a clear diagnosis under the guidance of the doctor to use medication, to avoid their own abuse of drugs.