Smart spectrophotometric assessment of tamsulosin hydrochloride and tadalafil in their new pharmaceutical formulation for treatment of benign prostatic hyperplasia and erectile dysfunction
Abstract
A novel combination of tamsulosin hydrochloride and tadalafil is recently available for treatment of benign prostatic hyperplasia and erectile dysfunction. For the first time, four simple, accurate, smart and robust spectrophotometric methods have been suggested for their simultaneous quantification. The methods, namely; first derivative, ratio difference, derivative ratio and mean centering of ratio spectra, successfully resolved the spectral overlap of their challenging binary mixture. Calibration curves were linear at 2.0-40.0 and 2.0-55.0 μg/mL for tamsulosin hydrochloride and tadalafil, respectively. The methods were validated according to ICH guidelines and statistically compared with the official ones, revealing no considerable difference with respect to accuracy and precision. Specificity of the developed methods was assessed by evaluating various laboratory prepared mixtures. Furthermore, the methods were successfully applied for the quantification of the two drugs in their combined dosage form.
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