What class of drug is finasteride classified as?

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Inhibitor of 5 alpha reductasePhosphodiesterase (PDE) inhibitorAlpha-adrenergic receptor antagonistAndrogen receptor antagonist

Explanation

Finasteride functions as a 5 alpha reductase inhibitor, which reduces the conversion of testosterone to dihydrotestosterone (DHT). It is not a phosphodiesterase inhibitor, alpha blocker, or androgen receptor blocker.