Eating cough medicine throat is itchy because of inflammation stimulation, drug allergies and other reasons. 1. Inflammatory stimulation: cough medicine takes time to take effect, and some cough medicine does not eliminate the role of inflammation caused by infection, after taking cough medicine, if there is acute pharyngolaryngitis and other diseases, the inflammatory reaction will not completely subside, the throat will still exist part of the inflammatory secretion of the throat parts of the irritation, which appeared in the throat, itchy symptoms, after coughing may be more pronounced. 2. Drug allergy: If the patient is allergic to some components of cough medicine, may also be due to allergic substances stimulation of the mucous membrane of the throat leading to mucosal edema, acute congestion and other symptoms, which may lead to the patient to appear throat itching, pain and other symptoms. If the symptoms of itchy throat after eating cough medicine, you should go to the hospital in time to diagnose the cause, to avoid aggravation of the situation.