Platycodon grandiflorum water can treat cough, but Yin deficiency cough should not be used, and need to pay attention to, the drug soak water to drink the active ingredients precipitation is limited, it is recommended that under the guidance of the doctor using water decoction way to take medicine. The main ingredient of Platycodon grandiflorum water is Platycodon grandiflorum. Platycodonopsis is flat, bitter, pungent, belonging to the lung meridian and stomach meridian, with the lung expectorant, phlegm, pharyngeal pus, applicable to cough and phlegm, sore throat, chest tightness and abdominal pain, urinary incontinence. Note that Yin deficiency cough, hemoptysis is prohibited, gastric ulcers should be used with caution. Excessive consumption, nausea and vomiting can occur adverse reactions. Platycodon grandiflorum can be used by decoction of soup for internal use, if drinking in water, the concentration of active ingredients may be insufficient, the specific efficacy of the drug is affected. The single flavor of Platycodon grandiflorum cannot treat all kinds of coughs. It is recommended to choose the appropriate prescription according to the specific type of cough, such as Stop Coughing Powder, Ma Xing Shi Gan Tang, Qing Jin Hua Phlegm Tang and so on. It is recommended to standardize the use of medication after a doctor’s diagnosis, not self-medication, so as not to delay the condition.