Efficacy of montelukast as an adjuvant therapy in rheumatoid arthritis patients: A randomized controlled study.

OBJECTIVE: This study aimed to evaluate the efficacy of montelukast in conjunction with non-biologic disease modifying anti-rheumatic drugs (nDMARDs) in rheumatoid arthritis (RA) patients.

METHODS: This study was a single-center randomized double-blinded placebo-controlled study. Adult RA patients were included if they had moderate to severe disease activity and were receiving monotherapy or combination of nDMARDs. Eligible patients were randomized, in 1:1 ratio, to receive either 10 mg montelukast or placebo, once daily for 16 weeks. The primary endpoint was the change in the 28-joints disease activity score (DAS28) 16 weeks after treatment. The patients' quality of life (QoL) was assessed by the Arabic version of the Health Assessment Questionnaire-Disability Index. Moreover, serum levels of vascular adhesion molecule-1 (VCAM-1) were measured.

RESULTS: A total of 87 patients completed the study; 44 in the montelukast arm and 43 in the control arm. After 16 weeks of treatment, disease activity decreased significantly in the montelukast arm with mean change in DAS28 (95% CIs) of -1.5 (-1.7, -1.2) while the control arm showed no improvement (0.2 (0.0, 0.4), p < 0.01). The QoL of the patients improved significantly from baseline in the montelukast arm (p < 0.01) but not in the control arm (p = 0.08). The median (IQR) serum levels of VCAM-1 were significantly lower in the montelukast arm (22.8 (15.0-32.7)) than in the control arm (28.9 (15.4-42.8), p = 0.004).

CONCLUSION: The co-administration of montelukast with nDMARDs in RA patients enhanced the anti-rheumatic effect which was reflected clinically by decreased disease activity.