A synthetic agent derivative of pyrimido-pyrimidine, with antiplatelet properties. 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. Check foractive clinical trials using this agent. or A drug that prevents blood cell clumping and enhances the effectiveness of fluorouracil and other chemotherapeutic agents.