<prompt> Tolazine is used as:A thrombin inhibitor in perpheral angiographyA vasodilatol in treating coronary aery stenosis during angio proceduresA vasoconstrictor in treatment of varicesantispasmodic during biliary spasm  <response>: Ref; GOODMAN GILMANS The Pharmacological Basis of the Therapeutics 10th edition page no; 245 Tolazoline is an alpha adrenergic antagonist. used as an aid in visualizing distal peripheral vessels during aeriography and a vasodilator in treating coronary aery stenosis during angio-procedures 