To assess the effect of a group-based intervention on the balance between necessity beliefs and concern beliefs about medication and on medication non-adherence in patients with rheumatoid arthritis (RA).
Non-adherent RA patients using disease-modifying anti-rheumatic drugs (DMARDs) were randomized to an intervention or control arm. The intervention consisted, amongst others, of two motivational interviewing-guided group sessions led by the same pharmacist. Control patients received brochures about their DMARDs. Questionnaires were completed up to 12 months follow-up.
123 patients (mean age: 60 years, female: 69%) were randomized. No differences in necessity beliefs and concern beliefs about medication and in medication non-adherence were detected between the intervention and control arm, except at 12 months' follow-up: participants in the intervention arm had less strong necessity beliefs about medication than participants in the control arm (b: -1.0 (95% CI: -2.0, -0.1)).
Absent intervention effects might have been due to, amongst others, selection bias and a suboptimal treatment integrity level. Hence, targeting beliefs about medication in clinical practice should not yet be ruled out.
This trial did not demonstrate superiority of our intervention over the control arm in changing beliefs about medication or in improving medication adherence over time.