<prompt> Dopamine is preferred in treatment of shock because ofRenal vasodilatory effectincreased cardiac outputPeripheral vasoconstructionProlonged action  <response>: ref; KD Tripathi 6th edition pharmacology page no;134 Dopamine DA is a dopaminergic D1 and D2 as well as adrenergic alps 1 b 1 but not b2 agonist. The D1 receptors in renal and mesenteric blood vessels are the most sensitive: i.v. infusion of a low dose of DA dilates these vessels by raising intracellular cAMP. This increases GFR and Na excretion. 