NCIt definition : A phenylbutazone derivative with uricosuric and antithrombotic properties. Sulfinpyrazone
competitively inhibits reabsorption of urate at the proximal renal tubule in the kidney.
This agent acts on the organic anion transport exchanger, thereby increasing uric
acid excretion and decreasing serum uric acid levels resulting in the prevention of
urate deposition. Sulfinpyrazone also blocks tubular excretion of various acidic drugs,
resulting in increased serum concentration of the drugs. In addition, sulfinpyrazone
and its active metabolite inhibit the synthesis of thromboxane A2, by competitively
inhibiting the activity of cyclooxygenase, thereby preventing platelet aggregation
through restoration of platelet survival time to normal, and decreasing platelet adhesiveness
to subendothelial cells.;