Selective and validated kinetic spectrophotometric method for the determination of irbesartan in pure and pharmaceutical formulations.

•For the first time in the literature, irbesartan is determined by kinetic spectrophotometric method based on oxidative coupling reaction with MBTH.•The method was successfully applied for analysis of real pharmaceutical samples.•The method validation demonstrated good recoveries and low detection limit 0.40μg/mL.•One of the lowest detection limits without impairing the sample throughout or using toxic chemicals.