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Objective Studies have been conducted to determine the causal factors and clinical consequences of non-adherence to treatment in systemic lupus erythematosus (SLE). However, no interventions have been performed to increase drug adherence. Our objective was to assess the effectiveness of pharmaceutical care (PC) for drug treatment adherence in lupus nephritis (LN). Methods This was a randomized clinical trial (pragmatic trial) in patients with LN in Rio de Janeiro, Brazil, allocated in two groups: an intervention group (Dader Method for PC) and a control group (institution's usual care). Drug treatment adherence was measured by the combination of five questions normally used in clinical practice. Results A total of 131 patients were randomized, and 122 completed the study, with a mean follow-up of 12.7 months and use of six drugs per day and 10–12 doses per day. Low adherence was observed at baseline (intervention group: 30%; control group: 29%). PC showed 27% effectiveness (95% confidence interval (CI) –6% to 50%) in the intention to treat analysis and 31% (95% CI 0–52%) in per protocol analysis, considering all drugs. As for adherence to specific drugs for SLE, effectiveness of PC was 64% (95% CI 34–80%) with intention-to-treat analysis and 62% (95% CI 32–79%) in per protocol analysis. Conclusions PC was effective for increasing drug treatment adherence in SLE. The detailed account provided by the Dader Method of the difficulties with patients' drug therapy proved invaluable to approach non-adherence.

The objectives of this study were to measure the prevalence of adherence to drug treatment and analyze associations with characteristics pertaining to the treatment, disease, health professionals and services, and socio-demographic issues in patients with systemic lupus erythematosus (SLE) in the city of Rio de Janeiro, Brazil. A sample of 246 women with SLE was analyzed. The data were collected through individual interviews and a review of patient charts. Adherence was estimated according to the Morisk criteria, and the associated factors were analyzed by hierarchical modeling. The percentage of patients classified as adherent to treatment was 31.7%. The reasons cited for non-adherence were: carelessness with drug administration times (52.43%), forgetfulness (38.21%), adverse drug reaction (13.8%), and interruption of treatment due to improvement in symptoms (7.72%). Factors associated with adherence were: behavior towards the presence of adverse drug reaction, hematological alterations, presence of mucocutaneous manifestations, legibility of the medical prescription, schooling, and family support. The study concludes that adherence to drug treatment in SLE is a complex and multifactorial phenomenon, and the results corroborate findings from studies conducted in developed countries. The hierarchical modeling proved to be a good alternative for evaluating adherence, since it allowed visualizing the various stages in the analysis.