Description: Isoproterenol is a potent bronchodilator and parenteral inotrope. It is a synthetic sympathomimetic amine structurally similar to epinephrine, with potent beta-agonist properties. As an inotrope, isoproterenol has largely been replaced by dobutamine, a beta1-specific agonist. Isoproterenol is also used infrequently as a bronchodilator due to the FDA approval of longer-acting and beta2-specific agents such as albuterol and salmeterol. Isoproterenol was approved by the FDA in 1947.