In the present work, a simple, sensitive, specific and validated colorimetric method has been developed for the quantitative estimation of losartan potassium in bulk and pharmaceutical dosage form. Losartan potassium in the presence of an acidic medium reacts with excess amount of chloramine-T and remaining chloramine-T reacts with crystal violet to produce greenish blue colour. The final stock solution was made to produce 100 µg/ml with distilled water. The λmax was found to be 618 nm for assay. The linearity was found in concentration range of 10-50 μg/ml. The correlation coefficient was found to be 0.9982. The regression equation was found as y=0.0181x +0.0091. The method was validated as per ICH Guidelines.
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