<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A selective beta-1 adrenergic receptor antagonist with antihypertensive activity and devoid of intrinsic sympathomimetic activity. Bisoprolol selectively and competitively binds to and blocks beta-1 adrenergic receptors in the heart, thereby decreasing cardiac contractility and rate. This leads to a reduction in cardiac output and lowers blood pressure. In addition, bisoprolol prevent the release of renin, a hormone secreted by the kidneys that causes constriction of blood vessels.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>