Retention of urine does not have the effect of shrinking the prostate. Common medications that shrink the prostate are finasteride. The main efficacy of Retention of Urine is to benefit the kidney and activate blood circulation, clearing away heat and clearing away gonorrhea. It is mainly used for frequent urination, urgent urination, painful urination and thin urine line caused by prostate hyperplasia. It mainly plays a role in relieving symptoms, and no study has found that it has the effect of shrinking the prostate. Retention of urine is mainly composed of Chinese herbs such as Psoralea, Motherwort, Qiancheng, Hai Jin Sha, Succinum, and Shan Ci Mushroom, etc. Adverse reactions such as feeling of thirst, stomach upset, and diarrhea may occur after taking it. Current research has found that Finasteride has a prostate-shrinking effect. It can reduce the level of androgens in the body, and then reach the purpose of shrinking the prostate, and play a role in the treatment of prostate hyperplasia. If you have a need for medication, you need to use it under the guidance of a physician or pharmacist, and the use of proprietary Chinese medicines needs to be recognized.