Deer antler is warm in nature and should not be taken by patients with yin deficiency and hyperactivity (deficiency of yin fluid and hyperactivity of yang energy), exogenous fever, or internal heat. Deer antler is a yang tonic, sweet, salty, warm, to the kidney, liver meridians. It has the effect of strengthening kidney yang, benefiting essence and blood, strengthening muscles and bones, regulating the stroke, and supporting sores and poisons. Deer antler is used to treat kidney yang deficiency (lack of yang energy in the kidneys), essence and blood deficiency of coldness (fear of cold, cold limbs), impotence and premature ejaculation, uterine cold and infertility; liver and kidney insufficiency (weakness of the liver and kidneys) of the tendons and bones, impotence and weakness; and non-menstrual bleeding or dribbling caused by the weakness of the two channels of the Chong Ren, affecting the function of fixing and regeneration and excessive leukorrhoea. Deer antler can also treat yin gangrene (is a kind of slow condition of yin sores and ulcers disease) broken ulcer does not heal for a long time and so on. Deer antler is warm in nature, easy to help the fire to hurt the yin. It is not suitable for patients with yin deficiency and hyperactivity of yang (symptoms such as low fever in the afternoon, sweating at night, irritability, etc.), exogenous fever (sudden high fever), and internal hyperthermia (symptoms such as redness of the face and ears, irritability of the heart and chest, dryness of stools, yellowish urine, accompanied by heat of the hands and feet, and dryness of the mouth and sore throat, etc.). Pregnant women should use this medicine with caution. Patients with chronic diseases such as hypertension, diabetes, heart disease, liver disease, kidney disease and children should take it under the guidance of a physician. The drug should be taken under the supervision of a physician. If there are symptoms of discomfort, you should consult a doctor in time, do not blindly take Chinese medicine on your own.