The present invention relates to a method for efficiently producing febuxostat which has pharmacological activity of inhibiting xanthine oxidase and which is used as a therapeutic agent for hyperuricemia, and a crystalline tablet prepared from the same . In the present invention, ethyl 2- (3-cyano-4-isobutoxyphenyl) -4-methylthiazole-5-carboxylate is produced in high yield by optimizing the base and solvent of the first reaction, , The hydrolysis reaction can also be optimized by optimizing the base and reaction conditions to completely eliminate the production of the reaction byproduct, 2- (3-carbamoyl-4-isobutoxyphenyl) -4-methylthiazole-5-carboxylic acid, It is possible to obtain a high purity starting material at a high yield. In addition, the reaction material used in the production method of the present invention is advantageous for commercial use, and the reaction conditions are also mild, so that it is useful for mass production of petroleum gas.
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