NCIt definition : A fixed combination of aspirin, a cyclooxygenase inhibitor, and dipyridamole, a phosphodiesterase
(PDE) inhibitor, with antiplatelet and antithrombotic activities. Upon oral administration
of aspirin/dipyridamole, aspirin binds to and irreversibly inhibits platelet cyclooxygenase,
thereby inhibiting thromboxane A2 formation. This prevents platelet aggregation and
vasoconstriction. Dipyridamole inhibits adenosine uptake by platelets and endothelial
cells, triggering an accumulation of cyclic adenosine monophosphate (cAMP), and inhibiting
the stimulation of platelet aggregation by agents such as platelet activating factor
and collagen.;