The present invention provides Crystalline ivabradine oxalate, optionally in a form characterized by at least one of the following: a) power X-ray diffraction peaks at about 2.04, 2.13, 4.26, 7.06, 8.02, 8.53, 9.32, 10.91, 13.63, 15.07, 16.1 l, 16.44, 17.48, 18.37, 19.32,20.38, 20.94,21.95, 23.61, 24.26, 27.54 and 33.07 degrees 20 or b) a differential scanning calorimetry thermogram, which shows one endothermic peak about 110°C.
