TAK-700 is a non-steroidal imidazole inhibitor and TAK-700 can inhibit CYP17 with IC50 of 28 nM. TAK-700 is a selective inhibitor for CYP17 over 11beta-hydroxylase by an impressive 260-fold.[1] TAK-700 can reduce testosterone and DHEA levels.
In vivo
TAK-700 exhibits suppressive effects on testosterone biosynthesis in rats and reduction in the weight of prostate and seminal vesicles in the rat. TAK-700 is also capable of reducing serum testosterone levels down to castration level after 8 hours following a single oral administration of 1 mg/kg to monkeys.[1]