The IM estimation and control is a major analytical area where still we need more specific to improve the product quality. The developed HPLC method was simple, sensitive, precise and rapid method to analyse the BZL impurity in PHY bulk drug and formulations. The BZL impurity present in the bulk drug and marketed dosage form were analyzed using the developed method. The developed method was validated as per ICH guidelines. It can be used for the analytical research and developmental labs, general quality control labs