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Heparin
- indication:For anticoagulant therapy in prophylaxis and treatment of venous thrombosis and its extension, for prevention of post-operative deep venous thrombosis and pulmonary embolism and for the prevention of clotting in arterial and cardiac surgery.
- pharmacologypharmacology:
- mechanism: The mechanism of action of heparin is antithrombin-dependent. It acts mainly by accelerating the rate of the neutralization of certain activated coagulation factors by antithrombin, but other mechanisms may also be involved. The antithrombotic effect of heparin is well correlated to the inhibition of factor Xa. Heparin interacts with antithrombin III, prothrombin and factor X.
- toxicity: Heparin sodium - Mouse, median lethal dose greater than 5000 mg/kg. Another side effect is heparin induced thrombocytopenia (HIT syndrome). HIT is caused by an immunological reaction that makes platelets form clots within the blood vessels, thereby using up coagulation factors
- absorprion: Some oral absorption but lack of anticoagulant effect. Rapidly taken up by endothelial cells with remainder bound to plasma proteins.
- halflife: 1.5 hours
- roouteelimination:
- volumedistribution:
- clearance: