Finasteride Cas:98319-26-7
In medicine, the side effect of finasteride has a name called Post finasteride syndrome, or PFS.

Finasteride is a basic drug for the treatment of prostatic hyperplasia and prostatitis in China. It is a synthetic 4-nitrosteric hormone compound, which belongs to the resistance hormone drug. It can selectively inhibit 5α - reductase, inhibit the conversion of testosterone into 5α - dihydrotestosterone (DHT), reduce the level of male hormone in prostate cells, and reduce the prostate-specific antigen in serum. The enlarged prostate volume shrinks and the urine flow rate increases, thereby reducing the symptoms of patients and achieving the purpose of treating prostate hyperplasia.
The action of the drug is characterized by the selective blocking of androgen stimulation of the prostate gland, but it rarely affects the sexual function of men. Prostatic hyperplasia, also known as hypertrophy of the prostate, causes compression of the bladder neck and posterior urethra, causing urinary tract obstruction and other symptoms and complications, making patients deeply painful, mostly in men over the age of 50.
Treatment of male pattern hair loss drug finasteride is also a specific inhibitor of 5α-reductase, a class of resistant hormones, it can prevent the conversion of testosterone to DHT, thereby reducing the synthesis of DHT, reduce the content of scalp hair follicles and serum DHT, restore the hair growth function of the hair follicle that has been suppressed, promote hair growth and prevent further hair loss. Finasteride is currently the only oral drug approved by the U.S. Food and Drug Administration for the treatment of male pattern baldness, and the recommended dose is 1mg once.


