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  • Title: The effect of a thromboxane synthetase inhibitor, dazoxiben, and acetylsalicylic acid on platelet function and prostaglandin metabolism.
    Author: Dale J, Thaulow E, Myhre E, Parry J.
    Journal: Thromb Haemost; 1983 Oct 31; 50(3):703-6. PubMed ID: 6689091.
    Abstract:
    Twenty-four men received either placebo, 0.1 g of the thromboxane synthetase inhibitor dazoxiben, 0.25 or 1.0 g of acetylsalicylic acid (ASA). Dazoxiben reduced the maximal rate of collagen-induced platelet aggregation, but less than did ASA. ASA abolished secondary, ADP-induced aggregation, dazoxiben not. Both drugs prolonged the bleeding-time. Plasma thromboxane B2 (TxB2) levels did not change significantly after dazoxiben, whereas the prostacyclin metabolite 6-keto-PGF1 alpha rose. The larger dose of ASA reduced both TxB2 and 6-keto-PGF1 alpha in plasma. Whole blood was allowed to clot in order to estimate prostaglandin metabolism. Both drugs prevented thromboxane production effectively. Formation of 6-keto-PGF1 alpha decreased by 95 per cent after ASA but was more than doubled after dazoxiben. Dazoxiben is a selective and effective thromboxane synthetase inhibitor, but has a weaker effect on platelet reactivity than ASA, possibly because endoperoxide formation is not prevented.
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