SIMULTANEOUS ESTIMATION OF LOPERAMIDE HYDROCHLORIDE AND NORFLOXACIN BY VALIDATED UV- SPECTROPHOTOMETRIC METHOD

A simple, accurate, precise and reproducible spectrophotometric method has been developed and validated for the simultaneous estimation of Loperamide hydrochloride and Norfloxacin in combined capsule dosage form by Q-Absorbance ratio method. Q-Absorbance ratio method involves two wavelengths; the iso-absorptive point and λmax of loperamide hydrochloride i.e. 231.5 nm and 222 nm respectively in methanol. The linearity was detected in the range of 535 µg/ml (R 2 = 0.999) for Loperamide hydrochloride and 1-7 µg/ml (R 2 = 0.998) for Norfloxacin. The accuracy existed between 98-102% and the %RSD was less than 2%. The developed method was validated for linearity, accuracy and precision as per ICH guidelines.