Finasteride tablets are an oral medication for prostate enlargement, a 5 alpha-reductase inhibitor that inhibits the conversion of testosterone to dihydrotestosterone, thereby reducing the level of active testosterone, slowing down prostate enlargement, and helping to reduce the size of the prostate and improve urinary symptoms. Finasteride tablets are relatively slow to work when taken orally and require a long course of treatment to achieve the desired effect. The usual dose of Finasteride Pi is 5mg, taken once a day for 3 months, for a long time. Finasteride tablets should be used according to medical advice and with caution in patients with cardiovascular disease, heart failure, and young patients to avoid sodium retention or sexual dysfunction.