Nitrarine 2HCl is a hypotensive? spasmolytic? coronary dilator? sedative in experimental arrhythmias. in experimental arrhythmias in the cat? caused by calcium chloride? Aconitine and electric cardiac stimulation? Nitrarine dihydrochloride presents a hypotensive? spasmolytic? coronary dilating and sedative action. Its antiarrhythmic properties are due to its stabilizating effects on the membrane and its coronary dilating action. Nitrarine dihydrochloride is 3-4 times as potent as Novocainamide and Quinidine? and the duration of its effect is 2-5 times longer than that of these products.