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Methotrexate (MTX) is one of the most commonly used disease-modifying anti-rheumatic drugs which can cause gastrointestinal side effects. MTX intolerance is defined as gastrointestinal and behavioral symptoms occurring before and after MTX administration. This study aims to evaluate and compare the frequency of methotrexate intolerance in adult and pediatric patients. Patients with a rheumatic disease who used oral or parenteral methotrexate for at least 3months were included in the study. Methotrexate intolerance was assessed using the