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Two simple, rapid and reproducible simultaneous equation and Q-Analysis   UV-Spectrophotometric methods have been developed for simultaneous   estimation of Etodolac (ETO) and Thiocolchicoside (THC) in combined tablet   dosage form. The methods involved solving simultaneous equations and Q-value   Analysis based on measurement of absorbance at wavelengths, 223 (λmax of   ETO), 259.4 nm (λmax of THC) and 236 nm (Iso-absorptive point). Linearity   was found in the concentration range of 1-6 μg/mL and 4 - 24 μg/mL for ETO &   THC respectively with coefficient correlation 0.9998 & 0.9992. The amount of   drugs estimated by proposed methods are in excellent agreement with label   claimed. Further-more, the methods were applied for the determination of ETO   and THC in spiked human urine. The degradation behavior of ETO and THC was   investigated under acid hydrolysis, alkali hydrolysis, photo and oxidative   degradation. The samples subsequently generated were used for degradation   studies using the developed method. Thiocolchicoside was found to degrade   extensively under alkali hydrolysis and unaffected by other stress   conditions while ETO was found to be stable in all stress conditions. The   methods were validated according to ICH guidelines. The method, suitable for   routine quality control, has been successfully applied to the determination   of both drugs in commercial brands of tablets

Simultaneous estimation of etodolac and thiocolchicoside in bulk and in tablet formulation by UV-spectrophotometry