The degradation study indicated that Olopatadine HCl was susceptible to acid, base and H2O2 while it was stable in direct sunlight and dry heat under experimental conditions (fig. 7, 8). Olopatadine HCl gets degraded into one to three degradation products in the stress conditions of acid-alkali hydrolysis as well as peroxide oxidation (fig. 4, 5, 6), while the drug showed no
degradation at 0 h in all the degradation conditions.