• Hypersensitivity to the active substance or to any of the excipients • Patients with severe renal impairment (CrCl < 30 ml/ min) • Active clinically significant bleeding • Organic lesion at risk of bleeding • Spontaneous or pharmacological impairment of haemostasis • Hepatic impairment or liver disease expected to have any impact on survival • Concomitant treatment with quinidine (see section 4.5)