Finasteride acts by blocking
Finasteride is a competitive inhibitor of the enzyme 5alpha-reductase which conves testosterone into more active DHT responsible for androgen action in many tissues. finasteride, dutasteride- used for prostate cancer and BPH (Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.302)
Alpha receptor
5 alpha reductase enzyme
5 alpha reductase enzyme
Beta receptors
Endocrinology