High-performance liquid chromatographic methods for the determination of ranitidine and related substances in raw materials and tablets.

High-performance liquid chromatographic methods have been developed for the determination of ranitidine and related compounds in drug raw material and tablets. The method has been shown to resolve at least nine related compounds from the drug. The sensitivity of the method to related compounds is better than 0.01%. Eight raw material samples and 11 tablet samples were examined for related compounds. Total impurities found ranged from 0.31 to 0.79% in raw materials and from 0.40 to 1.75% in tablets. Drug raw materials and tablets were assayed by HPLC; results for raw materials were between 98.2 and 101.1%, and those for tablets were between 96.1 and 102.2%, with a relative standard deviation for the assay of less than 1%. Raw material assay results were confirmed by nonaqueous titration.