Antistreptokinase Ab development; heart rate & rhythm disorders, angina pectoris. Inj site haemorrhage, ecchymoses, GI & genitourinary bleeding, epistaxis; allergic anaphylactic reactions eg, rash, flushing, itching, urticaria, angioneurotic oedema, dyspnoea, bronchospasm, hypotension; tachycardia, bradycardia; recurrent ischaemia, heart failure, reinfarction, cardiogenic shock, pericarditis, pulmonary oedema; nausea, diarrhoea, epigastric pain, vomiting; headache, back & musculoskeletal pain, chills, fever, asthenia, malaise; transient serum transaminases & bilirubin elevations.