Methotrexate (MTX) is an antiproliferative agent that is used in the treatment of patients with rheumatoid arthritis (RA). It can cause pancytopenia, which is observed rarely but can be fatal. In this article, we present three RA cases on MTX with multiple risk factors and comorbid diseases who developed MTX toxicity and pancytopenia. We suggest that there should be risk classifications for RA patients who are candidates for MTX treatment. Patients with multiple risk factors, those with poor cooperation who might have problems in receiving medication, and those who do not seem to follow regular visits might be better started on another disease-modifying agent. Key Words: Methotrexate, pancytopenia, risk factors ÖzetMetotreksat (MTX), romatoid artritli (RA) hastaların tedavisinde kullanılan antiproliferatif bir ajandır. Düşük doz MTX tedavisi, az görülen, fakat fatal olabilen bir yan etki olan pansitopeni tablosuna neden olabilir. Bu yazıda, RA tanısı ile MTX tedavisi almakta olan, çok sayıda risk faktörü ve eşlik eden hastalıkları olup, MTX'e bağlı pansitopeni gelişen üç olgu sunuldu. Romatoid artrit tanısı olan ve MTX tedavisine aday olan hastalarda, risk sınıflaması yapılması gerektiğini önermekteyiz. Multipl sayıda risk faktörü taşıyan, ilacı düzenli ve uygun şekilde alamayacak, aynı zamanda da düzenli takiplere gelemeyecek hastalarda MTX yerine farklı modifiye edici ajanlar tercih edilmelidir.
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