Isomeric methoxyl compound. Restores normal rhythm in auricular fibrillation, often supplements the action of Digitalis. Two doses of 3 grains each, three hours apart – if no symptoms of cinchonism develop, 4 doses 6 grs. Each daily. C. Harlan Wells. Paroxysmal tachycardia. Establishes normal heart rhythm at least temporarily, less in valvular lesions.