Effects of low dose methotrexate on relapsing-remitting multiple sclerosis comparison to Interferon β-1α: A randomized controlled trial

Methotrexate، a toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid، has been used to control autoimmune disease with different results. The aim of this study was to evaluate the effectiveness of low dose methotrexate in the relapsing-remitting multiple sclerosis (RRMS). Eighty patients with definite RRMS age 15 to 55 years were randomly allocated to receive a 12-months treatment course of either oral methotrexate (7. 5 mg/week) or intramuscular interferon β-1α (30 µg/week). Response to treatment was assessed at 12-months after start of therapy. The results of the study demonstrated significant reduction in relapse rate in both groups (p < 0. 01(. In 40 patients treated by methotrexate، the mean value (SD) of relapse rate decreased from 1. 75 (0. 74) to 0. 97 (0. 83) (p < 0. 01). Correspondingly، the mean value (SD) of relapse rate decreased from 1. 52 (0. 59) to 0. 57 (0. 78) (p < 0. 01). Decrease of relapse rate in interferon β-1α group was more than the other group (p = 0. 06). This study suggests that although treatment with methotrexate may significantly reduce relapse rate and slow progression of disease in patients with RRMS، but its efficacy is less than interferon β-1α and it may be better used as add-on therapy.