Danaparoid sodium (Orgaran) is an anticoagulant with an antithrombotic action due to inhibition of thrombin generation (TGI) by two mechanisms: indirect inactivation of Factor Xa via AT and direct inhibition of thrombin activation of Factor IX (an important feedback loop for thrombin generation). It also possesses a minor anti-thrombin activity, mediated equally via AT and Heparin Co-factor II producing a ratio of anti-Xa:IIa activity >22. It is used to prevent deep venous clots, particularly in situations with a high risk of clot formation, such as after hip surgery. Side effects Bleeding (solely restricted to patients undergoing cardio-pulmonmary surgery with by pass)<Magnani HN, Gallus AG. Heparin-induced thrombocytopenia (HIT) A report of 1478 clinical outcomes of patients treated with danaparoid (Orgaran) from 1982 to mid 2004." Thromb Haemost 2006; 95: 967-871> found in 4.6% of medical patients, 6.1% after major general and vascular surgery, but 42.3% after CPBS (due to lack of an effective antidote) for which it is now contraindicated. Low platelets, due to a low level of structural similarity between danaparoid and heparin, i.e.only in some patients sensitive to heparin or a LMWH but to date never developed spontaneously. Platelet count recovery was more frequent than in the control group in 2 comparative studies in patients with HIT Possibly Asthma exacerbations, due to allergies to sulfites contained within the medicine (no case has been reported to date).