Finasteride medication mainly relieves the symptoms of prostate enlargement, which may recur after stopping the medication. Current research suggests that prostate enlargement may be related to the action of dihydrotestosterone, and Finasteride belongs to the 5α-reductase inhibitors, mainly inhibit the conversion of testosterone into dihydrotestosterone, thus inhibiting the action of dihydrotestosterone on the prostate. After the use of the drug can reduce the size of the prostate, improve the patient’s symptoms of urinary difficulties. It should be noted that this drug is slow to take effect, and need to be taken for a long time in order to see the effect, and it is mainly to improve the symptoms of patients with prostate caused by too much dihydrotestosterone, for non-dihydrotestosterone caused by the patient’s effect is not good, and it can not be a complete cure for prostate hyperplasia, may recur after stopping the drug. Causes the recommendation to consult a professional doctor before using the drug to choose the appropriate treatment.