5 Alpha-Reductase Inhibitor

Definition 1

Any substance that inhibits steroid 5-alpha-reductase, an enzyme that converts testosterone into dihydrotestosterone (DHT). Since DHT has three times greater affinity for androgen receptors than testosterone, inhibition of 5-alpha-reductase results in a strong reduction in the androgenic effects of testosterone. (NCI Thesaurus)

Definition 2

A substance that blocks an enzyme needed by the body to make dihydrotestosterone (a male sex hormone made from testosterone). Dihydrotestosterone can cause the prostate to grow. 5-alpha reductase inhibitors are used to shrink an enlarged prostate gland and to improve the flow of urine in a condition called benign prostatic hyperplasia (BPH). A 5-alpha reductase inhibitor is a type of enzyme inhibitor. (NCI Dictionary)

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