Solubility Test: Solubility test for the drug olopatadine was performed
by using various solvents. The solvents include Water, Methanol,
Ethanol, Acetonitrile, 0.1 N Hydrochloric Acid (HCl), 0.1 N Sodium
Hydroxide (NaOH) and Chloroform. However, Methanol and 0.1N HCl in
a ratio 50:50 was chosen as a solvent for developing the method.