Hypersensitivity to bemiparin sodium, heparin or substances of porcine origin.
History of confirmed or suspected immunologically mediated heparin induced thrombocytopenia (HIT) (see Precautions).
Active haemorrhage or increased risk of bleeding due to impairment of haemostasis.
Severe impairment of liver or pancreatic function.
Injuries to or operations on the central nervous system, eyes and ears within the last 2 months.
Disseminated Intravascular Coagulation (DIC) attributable to heparin-induced thrombocytopenia.
Acute bacterial endocarditis and slow endocarditis.
Organic lesions susceptible of bleed (e.g.: active peptic ulcer, haemorrhagic stroke, cerebral aneurysm or cerebral neoplasms).