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Research Paper Open Access
Two simple, accurate, and precise methods for simultaneous estimation of tramadol hydrochloride and chlorzoxazone in combined dosage form have been described. The first method employs formation and solving of simultaneous equations using 272.20 and 248.30 nm as two analytical wavelengths. The second method is absorption ratio method, which uses 272.20 and 257.50 nm as two analytical wavelengths. Both the methods allow the simultaneous determination of tramadol hydrochloride and chlorzoxazone in concentration ranges employed for this purpose with the standard deviation of <1.0% in the assay of tablet.