Abstract:
:Because platelets are so important in thrombus formation, drugs which inhibit platelet function (the 'antiplatelet drugs') have considerable potential as antithrombotic agents. Among the antiplatelet drugs, only aspirin, sulphinpyrazone, dipyridamole, hydroxychloroquine, and clofibrate have had wide clinical trial. Their effects on platelet metabolism differ. Aspirin prevents platelet prostaglandin synthesis by acetylating and irreversibly inactivating platelet prostaglandin synthetase, while sulphinpyrazone is a reversible inhibitor of the same enzyme. Both aspirin and sulphinpyrazone impair the platelet release reaction and reduce platelet aggregation, but neither prevents platelet adhesion to the subendothelium or to foreign surfaces. On the other hand, dipyridamole reduces platelet adhesion as well as aggregation, probably by inhibiting phosphodiesterase and so raising platelet cyclic AMP levels. The effects of hydroxychloroquine and clofibrate have been less well defined. As the antiplatelet drugs form a diverse group of substances with differing effects on platelet function, it is hardly surprising that every potential clinical application of each antiplatelet drug or drug combination has had to be tested separately, and that these drugs have not proved to be equally effective. One or more antiplatelet drugs have now been evaluated in each of the following situations.
journal_name
Drugsjournal_title
Drugsauthors
Gallus ASdoi
10.2165/00003495-197918060-00002subject
Has Abstractpub_date
1979-12-01 00:00:00pages
439-77issue
6eissn
0012-6667issn
1179-1950journal_volume
18pub_type
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