A 55 year-old man with unstable angina is treated with an intravenously administered glycoprotein IIb - IIIa inhibitor. The mechanism of action of this agent is the ability to.: (A) Dilate coronary arteries, (B) Inhibit platelet aggregation, (C) Inhibit platelet adhesion, (D) Inhibit atherogenesis
Answer is B. Solution:
Glycoprotein IIb - IIIa

Prevent the action of the platelet surface receptor glycoprotein complex, which is mrequired for formation of fibrinogen bridges between adjacent platelets.
Thus inhibiting platelet aggregation.