Mussel powder can treat cough, but Qingdai cannot treat cough. Mussel powder has the efficacy of clearing away heat and resolving phlegm, tranquilizing the mind, harmonizing the stomach and restraining acidity, and can be used to treat phlegm and drink (pathological products formed by the impaired metabolism of water and liquid), cough, vomiting, dysentery, chancre, wet sores, carbuncle, swelling and other diseases. The adverse reactions and contraindications of this drug are not clear. Qingdai has the effect of clearing heat and removing toxins (removing heat and toxicity from the body), diarrhea, cooling the blood and eliminating spots, the drug can be used to treat the temperature and toxicity spots (warm and hot toxins invade the body resulting in spots and patches on the skin), pediatric eclampsia, mumps, laryngeal paralysis (pharyngeal redness, swelling, pain, or dryness, a foreign body sensation, or pharyngeal itching and discomfort, dysphagia), and other diseases, but it can not be used for the treatment of cough. People with cold stomach should be cautious of using Qingdai. It is recommended that patients with cough need to consult a doctor in time, the doctor will choose the appropriate herbal treatment for the cause of the cough. In addition, the patient should be under the guidance of the doctor with mussel powder or Qingdai treatment, not unauthorized use of drugs.