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5-alpha-reductase inhibitor
From Wikipedia, the free encyclopedia
5α-reductase inhibitors (or 5-alpha-reductase inhibitors) are a group of drugs with antiandrogenic activity, used in the treatment of benign prostatic hyperplasia and androgenic (or androgenetic) alopecia. These drugs decrease the levels of available 5α-reductase prior to testosterone binding with the enzyme, thus reducing levels of dihydrotestosterone that derives from such a bond.
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5α-reductase inhibitors are clinically used in the treatment of conditions which are exacerbated by dihydrotestosterone. Specifically, these indications may include: (Rossi, 2004)
- mild-to-moderate benign prostatic hyperplasia
- androgenic (or androgenetic) alopecia
Adverse drug reactions (ADRs) experienced with 5α-reductase inhibitors are generally dose-dependent. Common ADRs include impotence, decreased libido, decreased ejaculate volume. Rare ADRs include: breast tenderness and enlargement, and allergic reaction. (Rossi, 2004)
The enzyme 5α-reductase is involved in the conversion of testosterone to the active form dihydrotestosterone by reducing the Δ4,5 double-bond. In benign prostatic hyperplasia, dihydrotestosterone acts as a potent cellular androgen and promotes prostate growth - inhibiting the enzyme reduces the excessive prostate growth. In alopecia, pattern-baldness is one of the effects of androgenic receptor activation. Reducing the levels of dihydrotestosterone thus reduces alopecia.
- finasteride (Proscar, Propecia)
- dutasteride (Avodart)
- FCE 28260, an experimental compound
- Rossi S (Ed.) (2004). Australian Medicines Handbook 2004. Adelaide: Australian Medicines Handbook. ISBN 0-9578521-4-2
| Urologicals (G04) | |
|---|---|
| Acidifiers | Ammonium chloride, Calcium chloride |
| Urinary antispasmodics | Darifenacin, Emepronium, Flavoxate, Meladrazine, Oxybutynin, Propiverine, Solifenacin, Terodiline, Tolterodine, Trospium |
| For erectile dysfunction | Alprostadil, Apomorphine, Avanafil, Moxisylyte, Papaverine, Phentolamine, Sildenafil, Tadalafil, Udenafil, Vardenafil, Vendafidel, Yohimbine |
| Other urologicals | Acetohydroxamic acid, Collagen, Dimethyl sulfoxide, Magnesium hydroxide, Phenazopyridine, Phenyl salicylate, Succinimide |
| For benign prostatic hypertrophy | 5α-reductase inhibitors: Dutasteride, Finasteride Alpha blockers: Alfuzosin, Doxazosin, Tamsulosin, Terazosin |