Coughing and phlegm in the throat after a cold is often a sign of pharyngitis, and if the situation is more serious, there may also be tracheitis, bronchitis or pneumonia. The first thing to do is to go to the hospital for a chest X-ray or chest CT to see if there is bronchitis or pneumonia. If there is any of the above conditions, intravenous medication is often needed. After a cold, there is often a combination of bacterial infections that require intravenous antibiotics, such as cefoperazone or ceftriaxone, and penicillins are also available. If there is an allergy to the above medications, azithromycin or erythromycin can be administered intravenously. If there is no bronchitis or pneumonia, it may be laryngitis or tracheitis, which can be treated with oral anti-inflammatory drugs, such as cefixime or cefradine. If the amount of phlegm is relatively large, it is also necessary to use drugs to dissolve phlegm, such as aminoglutethimide oral solution or aminoglutethimide hydrochloride.