Metalyse is contraindicated in patients with known hypersensitivity to the active substance tenecteplase, gentamicin (a trace residue from the manufacturing process) or to any of the excipients; situations associated with a risk of bleeding such as: significant bleeding disorder at present or within the past 6 months, known haemorrhagic diathesis; any history of central nervous system damage (i.e. neoplasm, aneurysm, intracranial or spinal surgery); severe uncontrolled arterial hypertension; prolonged or traumatic cardiopulmonary resuscitation (>2 minutes) within the past 2 weeks; severe hepatic dysfunction, including hepatic failure, cirrhosis, portal hypertension (oesophageal varices) and active hepatitis; active peptic ulceration; arterial aneurysm and known arterial/venous malformation; neoplasm with increased bleeding risk; acute pericarditis and/or subacute bacterial endocarditis; acute pancreatitis; acute ischaemic stroke without disabling neurological deficit; history or evidence or suspicion of intracranial haemorrhage including subarachnoid haemorrhage; patients with effective anticoagulation (e.g. INR >1.7) (see Bleeding under Precautions).