Spectrophotometric Estimation of Vardenafil Hydrochloride in Pharmaceutical Preparations and Environmental Wastewater Samples: Application to Content Uniformity Testing

Very Simple, accurate, precise, rapid, economical and highly sensitive UV spectrophotometric method has been developed for the estimation of vardenafil hydrochloride in pharmaceutical preparations and environmental wastewater samples, which shows maximum absorbance at 244 nm in distilled water. Beer's law was obeyed in the range of) 0.1-2μg/ ml (with molar absorptivity of 4.745×105 L.mol-1.cm-1, relative standard deviation of the method was less than 1.6%, and accuracy (average recovery %) was 100 ± 1.0. No interference was observed from common excipients and additives often accompany with vardenafil hydrochloride in pharmaceutical preparations. The method was successfully applied to the estimation of vardenafil hydrochloride in some pharmaceutical formulations (tablets) and industrial wastewater samples. The proposed method was validated by sensitivity and precision which proves suitability for the routine analysis of vardenafil hydrochloride in true samples. Application to content uniformity testing.