The price of lock yang ranges from 30 to 100 yuan per catty, and the specific price should be referred to the local pharmacy or hospital. Lock yang has the effect of tonifying kidney yang, benefiting essence and blood, and moistening the intestines and laxatives. It is mainly used for treating kidney yang deficiency (lack of yang energy in kidneys), essence and blood deficiency, lumbar and knee soreness and weakness (feeling of soreness and weakness in waist and knees), tinnitus, spermatorrhea and premature ejaculation, and intestinal dryness and constipation. It is forbidden for those with yin deficiency and fire (deficiency of yin and essence in the body and hyperactive deficiency fire), spleen deficiency and diarrhea (diarrhea caused by weak function of the spleen), and constipation due to dampness and heat. The price of lock yang will be affected by the origin, specifications and other factors, can not be generalized, it is recommended to go to the local regular medical institutions for purchase. The drug must be used under the guidance of a doctor, do not blindly self-medication.