Reduce or discontinue use if excessive BP or heart rate changes occur. Low baseline systolic or diastolic BP or at risk for hypotensive episode; ischaemic CV disease & concurrent anaemia; tachycardia, atrial fibrillation w/ rapid ventricular response or potentially life-threatening arrhythmias; cardiogenic shock, restrictive cardiomyopathy, hypertrophic cardiomyopathy, severe mitral valve insufficiency, myocardial rupture, cardiac tamponade, right ventricular infarction; heart failure after surgery, severe heart failure in patients awaiting heart transplantation. Correct severe hypovolaemia & low serum K conc prior to infusion. Perform non-invasive monitoring for haemodynamic effects for at least 4-5 days after end of infusion. Closely monitor ECG in patients w/ ongoing coronary ischaemia, long QTc interval or concomitant use w/ drugs prolonging QTc interval. Concomitant use w/ vasoactive agents including inotropic agents (except digoxin). Mild to moderate renal & hepatic impairment. Pregnancy. Not to be used during lactation. Not to be used in childn & adolescents <18 yr.