The aim of the study is to evaluate the rheumatoid arthritis (RA) patients' knowledge about methotrexate (MTX), the standard drug in the treatment of RA, through a questionnaire. In August-October 2017, patients who used MTX with a diagnosis of RA in a university hospital were asked to answer questionnaire about the mechanism of action of MTX, administration method, drug interaction, side effects, frequency of follow-up of patients and changes to the lifestyle that should be done. One hundred and sixty-two patients (144 women) were included in the study. The mean patient age was 52 (18-77) years, the mean disease duration was 10.3 (1-40) years, and the mean duration of MTX use was 7.1 (1-38) years. 50% of the patients correctly answered that MTX is an anti-inflammatory drug that regulates the disease. 85% of patients correctly responded to the weekly application frequency correctly.; 19% of the patients stated that the reason for using folic acid was to reduce the toxicity of the treatment and again only 11% knew that trimethoprim was contraindicated. 11% were aware of the hematological risks and 11% were aware of the risk of hypersensitivity pneumonia. 51% of them had knowledge about laboratory tests. 20% of women and men of childbearing age knew that they should use contraception while using MTX. 34% stated that alcohol consumption should be limited. Men and those with a high level of education gave a statistically higher rate of correct answers. (p=0.019, p=0.000) It was observed that the patients had insufficient knowledge about MTX, which is frequently used in RA patients in daily practice. There are shortcomings on important issues, especially serious side effects, drug interactions, and birth control. Patient information regarding MTX should be checked and supported regularly by using different training tools.