About Ephedrine Alpha/Beta Adrenergic Agonist , Sympathomimetic amine, Stimulant, vasopressor(parenteral), bronchodilator. Mechanism of Action of Ephedrine Ephedrine is a mixed acting sympathomimetic drug which mainly acting indirectly but also has some direct action on alpha and beta adrenergic receptors. It causes release of nor-epinephrine from it`s storage sites and stimulates alpha and beta adrenergic receptors. It relaxes bronchial smooth muscle by stimulating beta-2 adrenergic receptors and thus causes increased vital capacity, relief of mild bronchospasm, improved air exchange and decreased residual volume. Ephedrine produces cardiac stimulation with increased systolic and diastolic pressure when nor-epinephrine stores aren`t depleted. It produces positive inotropic effects with low doses through action on beta-1 receptors in heart. It causes vasodilatation through beta-2 receptors and vasoconstriction through alpha adrenergic receptors. Presser effects results from vasocons