D-Phenylalanyl-L-prolyl-L-arginine aldehyde sulfate (RGH-2958), a directly acting synthetic thrombin inhibitor proved to be effective by experimental oral application. The rapid onset of its action has a special importance both from theoretical and practical point of view. Its antiplatelet effect relates to thrombin induced PA and runs parallel with the anticoagulant effect. RGH-2958 significantly reduced the thrombus weight in an experimental thrombosis model in rabbits. In the light of the therapeutic indices of the compound there is a real possibility to open a third way in the prevention and therapy of thrombosis.
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