There is no clear research indicating when to take Colla Corii Asini as a tonic. Colla Corii Asini can be used for vomiting blood and urinating blood, dizziness and palpitations (rapid heartbeat, often accompanied by panic), etc. Colla Corii Asini can be used as prescribed by the doctor if there are related symptoms. Colla Corii Asini can be used as both Chinese medicine and food. As a Chinese medicine, it belongs to the lung, liver and kidney meridians, and is sweet and flat in nature. It has the effect of stopping bleeding, moistening dryness and nourishing yin, tonifying blood, and can be used for coughing with dryness of the lungs, coughing up blood, coughing with labor; fetal leakage in pregnancy (small amount of bleeding from the vagina in early pregnancy), blood in the urine, vomiting blood, leakage of blood in the stool (excessive menstruation or dripping more than a few drops of), and it is the essential medicine for stopping bleeding. Colla Corii Asini can also be used for blood deficiency, dizziness, palpitations, muscle impotence, especially good for treating bleeding caused by blood deficiency; hands and feet convulsions, false wind internal movement, disturbed sleeplessness, fever and Yin injury. It should be noted that the adverse effects of Colla Corii Asini are not clear, and should be used with caution for those with weak spleen and stomach. Do not use the drug by yourself, please use it under the guidance of a professional doctor.