title: Effect of sulphinpyrazone on human platelet aggregation, 5-hydroxytryptamine release and adhesion ex vivo: comparison with naproxen.
abstract: 1 The effects of single doses of naproxen and sulphinpyrazone and of 4 and 8 days treatment with sulphinpyrazone on human platelet responsiveness were compared. 2 A single dose of sulphinpyrazone had no effect whereas a single dose of naproxen caused a five-fold depression in responsiveness to collagen. 3 Repeated administration of sulphinpyrazone led to a weak and equivocal inhibitory effect on collagen-induced aggregation, second phase aggregation in response to ADP and adhesion to collagen. There was no effect on ADP-induced first phase aggregation, adrenaline-induced second phase aggregation or platelet retention in glass bead columns. 4 It is concluded that the anti-aggregant activity of sulphinpyrazone is too weak to be a major factor in its reported effect on the incidence of cardiac death.
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism; D003094:Collagen / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D009288:Naproxen / Q000494:pharmacology*; D010973:Platelet Adhesiveness / Q000187:drug effects; D010974:Platelet Aggregation / Q000187:drug effects; D012701:Serotonin / Q000097:blood*; D013442:Sulfinpyrazone / Q000494:pharmacology*
chemical_list: D012701:Serotonin; D009288:Naproxen; D000244:Adenosine Diphosphate; D003094:Collagen; D013442:Sulfinpyrazone