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Liarozole dihydrochloride (R75251; R85246) is a cytochrome P450 (CYP450) dependent inhibitor, orally active, it also a potent inhibitor of estrogen (via inhibition of aromatase) and testicular androgen synthesis (inhibition of 17 ,20-lyase). Liarozole dihydrochloride prevents the catabolism of retinoic acid via inhibition of 4-hydroxylase and exhibits retinoid sparing and retinoid-mimetic effects in vivo. Liarozole dihydrochloride is an imidazole derivative; it is being investigated as a non-hormonal agent in prostate cancer and in the treatment of various other cancers and skin disorders[1].

Liarozole inhibits the metabolism of retinoic acid to more polar metabolites in hamster liver microsomes (IC50=2.2 μM), rat liver homogenate (IC50=0.14 μM), dunning prostate cancer homogenate (IC50=0.26 μM) and MCF-7 human breast cancer cells (almost complete block at 10μM) [1].Liarozole inhibits 17a-hydroxylase activity in bovine adrenal microsomes (IC50=0.15 μM) [1].Liarozole has modest inhibitory activity on cholesterol synthesis in human hepatoma cells(IC50=5 μM)[1].

[1]. Bryson HM, et al. Liarozole. Drugs Aging. 1996 Dec;9(6):478-84; discussion 485.

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