[Calcium-depended mechanism of the antiplatelet activity of benzimidazole derivative RU-891].

We have studied the effect of the new benzimidazole derivative RU-891, known to exhibit antiaggregant activity in vitro and in vivo, on the level of intracellular calcium ions in platelets of laboratory rabbits. Compound RU-891 was found to inhibit the thrombin-induced growth of intracellular calcium ion level in thrombocytes.This effect exceeded t he action o f reference d rugs and was not connected w ith the influence of RU-891 o n the potential-dependent c alci u m channels.