The use of Yinhu Cold & Flu Dispersion needs to be determined according to the severity of the cold, the cause of the cold, the patient’s personal physical quality, the response to the treatment of the drug, etc., and cannot be generalized. Yinhu Cold San has the efficacy of dispelling wind and clearing heat and toxins, which is more effective for symptoms such as stuffy and runny nose, cough and discomfort caused by wind-heat cold, but less effective for inflammation caused by bacterial and viral infections, such as bronchitis and pneumonia. Generally, you need to use it for 2-3 days, 8-12 hours a day, and then judge whether you need to continue using it according to your specific physical condition. If the symptoms of cold do not ease after 2-3 days of use, but worsen, the patient needs to go to the respiratory department of the hospital in time to clarify the cause and then treat the symptoms. If itching, redness and swelling appear in the area after using Yinhu cold and flu patch, you should stop using it immediately and wash it off.