Phlegmolytic drugs for pharyngitis include drugs such as ammonium chloride, aminobromine, acetylcysteine, etc. Due to individual variability, the response to the drugs varies, and they need to be used under the guidance of a doctor. At the same time, the cause of pharyngitis needs to be treated. Clinical drugs commonly used to dissolve phlegm include phlegm-thinning drugs and phlegm-dissolving agents. Phlegm-thinning drugs include drugs such as ammonium chloride, which can dilute phlegm by stimulating vagus nerve excitation and thus promoting secretion of bronchial glands. Sputum dissolvers include drugs such as Ambroxol and Acetylcysteine, whose main mechanism of action is to act on mucins to reduce the concentration of sputum, thus facilitating sputum expulsion. Phlegm dissolving drugs are only symptomatic drugs, but more importantly, they need to address the cause of the disease, such as bacterial infections caused by the need for antibiotic treatment; allergies caused by the need for oral anti-allergy drugs; gastroesophageal reflux caused by the need for oral acid inhibitors and gastric stimulants, and so on. Due to individual differences, there is no absolute most effective drug, need to be under the guidance of the doctor for treatment.