Colla Corii Asini is generally recommended to take about two weeks to stop, but due to the influence of each patient’s condition, constitution and other factors, the specific time to take the medicine, should be subject to the doctor’s advice. Colla Corii Asini is a solid gum made from the dried or fresh skin of donkeys of the family Equidae by decoction and concentration. It is sweet in flavor and flat in nature. Attributed to the lung, liver, kidney meridian. It can tonify blood and nourish yin, moisten dryness and stop bleeding. It can be used for blood deficiency, dizziness, palpitations, impotence, insomnia, deficiency wind, lung dryness, cough, vomiting blood, urinating blood, blood in stool and leakage of blood (excessive menstruation or dripping), pregnancy leakage of fetus (small amount of vaginal bleeding in early pregnancy), and so on. Avoid greasy food during the period of taking Colla Corii Asini; be cautious of those with weak spleen and stomach, vomiting and diarrhea, abdominal distension and loose stools (thin and unformed stools), cough and phlegm. If there is no improvement in symptoms or symptoms worsen during two weeks or during the period of taking the medicine, or if new serious symptoms appear, stop taking the medicine immediately and go to the hospital for consultation. It is recommended to use the medicine under the guidance of a doctor.