Bilastine: Method development and Validation deals with the development of a new simple, rapid, specific, accurate and precise UV spectrophotometric method for Active Pharmaceutical Ingredient (API) and in pharmaceutical dosage form. The validation of the proposed method was carried out according to the I.C.H guidelines. Bilastine being a new second generation H1histamine has shown beneficial action in treatment of many allergic conditions. Validation parameters covering all the qualitative and quantitative estimation of the drugs are mentioned along with the acceptance criteria as mentioned in the guidelines of the ICH.