One simple, sensitive and accurate spectrophotometric method for the determination of sildenafil citrate has been developed and validated. This method was based on oxidation of sildenafil citrate with excess amount of ceric ammonium sulfate in presence of an acidic medium and unreacted ceric ammonium sulfate reacts with malachite green to produce yellowish green colour. The final solution was made to produce 100 µg/ml with distilled water. The λmax was found to be at 455 nm. The linearity was found in concentration range of 5-30 μg/ml. The correlation coefficient was found to be 0.9996. The regression equation was found as Y = 0.0274x.0.0011. The method was validated as per USP and ICH guidelines.
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