[1][2][3][4][5] It shows 92% of the affinity of testosterone for the androgen receptor and negligible affinity for other steroid hormone receptors.

[1][2] The medication is a silent antagonist of the androgen receptor.

[5] RU-56187 is 3- to 10-fold more potent as an antiandrogen than bicalutamide or nilutamide in animals.

[1] Both RU-56187 and RU-58841 appear to be prodrugs of cyanonilutamide (RU-56279) in vivo in animals.

This drug article relating to the genito-urinary system is a stub.