First, to assess the clinical characteristics and medication adherence to oral rheumatoid arthritis (RA) medications in patients with RA. Second, to examine adherence determinants with a focus on the effect of medication out-of-pocket (OOP) costs on medication adherence to oral RA medications. Lastly, to examine cost-related medication non-adherence (CRN) in patients with RA.
A cross-sectional study of patients with RA was conducted at rheumatology outpatient clinics in Shiraz, Iran. The data collection survey consisted of 5 sections including demographic questions, disease-related questions, Compliance Questionnaire Rheumatology (CQR), CRN questions and an open-ended question. SPSS version 24 was used for analysis.
A total of 308 completed surveys were collected. Adherence to oral RA medications was 40.3%. Just under 20% of participants were biologic disease-modifying antirheumatic drugs (bDMARDs) users and these bDMARDs users were 0.82 times less likely to be adherent to their oral RA medications compared to non-bDMARDs users (P < 0.05). There was no statistically significant association between OOP costs and adherence to oral RA medications (P > 0.05). However, 28.7% of participants reported not refilling, delaying to refill, skipping doses or taking smaller doses due to cost. In findings of the open-ended question, medication costs and affordability were the most commonly mentioned barriers to medication adherence.
Non-adherence to oral RA medications was prevalent among Iranian patients with RA and OOP costs were a barrier to medication adherence.