Which of the following blocks the ADP receptor on the antiplatelet membrane?
A. Eptifibatide
B. Dipyridamole
C. Clopidogrel
D. Abciximab
Answer: C
Eptifibatide and abciximab bind to platelet glycoprotein IIb/IIIa receptor.
Dipyridamole inhibits platelet cyclic AMP phosphodiesterase and raises cyclic AMP levels.