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Three sensitive and precise stability-indicating methods were developed for the determination of alcaftadine in the presence of its degradation products. Efficient separation was achieved using UPLC-UV-MS method by gradient elution with a mobile phase of 0.1% aqueous formic acid (A) and 0.1% formic acid in acetonitrile ( over concentration range of 0.10-1.00 µg mL-1. The accuracy was 100.89% ± 0.74 and 99.73% ± 0.78 for UV and MS detection, respectively. A TLC-densitometric method was adopted to separate of the intact drug from its de