Hypersensitivity. Clinically significant active bleeding; hepatic disease associated w/ coagulopathy & clinically relevant bleeding risk; lesion or condition considered significant risk factor for major bleeding 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 use w/ other anticoagulant eg, unfractionated heparin (UFH), low molecular wt heparins (eg, enoxaparin, dalteparin), heparin derivatives (eg, fondaparinux), oral anticoagulants (eg, warfarin, rivaroxaban, dabigatran) except under specific circumstances of switching anticoagulant therapy, when UFH is given to maintain an open central venous/arterial catheter or during catheter ablation for atrial fibrillation.