Hypersensitivity. Active clinically significant bleeding. Lesion or condition including current or recent GI ulceration, presence of malignant neoplasms at high risk of bleeding, recent brain or spinal injury, recent brain, spinal or ophth surgery, recent intracranial haemorrhage, known or suspected oesophageal varices, arteriovenous malformations, vascular aneurysms or major intraspinal or intracerebral vascular abnormalities. Concomitant treatment w/ any other anticoagulants [eg, unfractionated heparin, LMWH (enoxaparin, dalteparin), heparin derivatives (fondaparinux), oral anticoagulants (warfarin, dabigatran etexilate, apixaban)]. Hepatic disease associated w/ coagulopathy & clinically relevant bleeding risk including cirrhotic patients w/ Child-Pugh B & C. Pregnancy & lactation.