Premium
Low Persistence Rates in Patients With Rheumatoid Arthritis Treated With Triple Therapy and Adverse Drug Events Associated With Sulfasalazine
Author(s) -
Erhardt Daniel P.,
Can Grant W.,
Teng ChiaChen,
Mikuls Ted R.,
Curtis Jeffrey R.,
Sauer Brian C.
Publication year - 2019
Publication title -
arthritis care and research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.032
H-Index - 163
eISSN - 2151-4658
pISSN - 2151-464X
DOI - 10.1002/acr.23759
Subject(s) - medicine , discontinuation , rheumatoid arthritis , hydroxychloroquine , sulfasalazine , adverse effect , combination therapy , methotrexate , etanercept , gastroenterology , disease , covid-19 , ulcerative colitis , infectious disease (medical specialty)
Objective Combination treatments for patients with rheumatoid arthritis ( RA ) with an inadequate response to methotrexate ( MTX ) alone include the addition of a tumor necrosis factor inhibitor ( TNF i) or the addition of sulfasalazine ( SSZ ) and hydroxychloroquine to MTX (triple therapy). We compared persistence and adherence rates between these 2 combination therapies in US veterans and report the reasons for discontinuation of combination treatment in these groups. Methods Using Veteran's Affairs clinical and administrative data from 2006 to 2012, veterans with RA escalating treatment from MTX to MTX ‐ TNF i or triple therapy were examined for a 12‐month period after combination initiation. Persistence was defined as treatment without a ≥90‐day gap in therapy. Adherence was calculated using the proportion of days covered ≥80% at 12 months. Matching weights–adjusted models were applied to more closely mimic randomization in this study. The reasons that patients discontinued their combination regimens were identified by chart abstraction. Results Full persistence at 1 year was 45% in the MTX ‐ TNF i patients (n = 2,125) and 18% in the triple therapy patients (n = 171) ( P < 0.001). Adherence was higher for the MTX ‐ TNF i group (26%) than the triple therapy group (11%) ( P < 0.0001). The triple therapy group was associated with significantly more treatment discontinuation, which was most often due to adverse drug events from SSZ . Conclusion Differences in persistence and adherence between the MTX ‐ TNF i and triple therapy groups appear to be primarily related to adverse drug events that were most often attributed to SSZ .