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ORIGINAL RESEARCH article

Front. Med.

Sec. Rheumatology

Volume 12 - 2025 | doi: 10.3389/fmed.2025.1618493

Treating Rheumatoid Arthritis in Zanzibar: a cost effectiveness study comparing conventional, biologic, and targeted-synthetic disease modifying anti-rheumatic drugs

Provisionally accepted
Sanaa  S SaidSanaa S Said1,2,3,4,5*Melf-Jakob  KühlMelf-Jakob Kühl6,7Bjorg-Tilde  Svanes FevangBjorg-Tilde Svanes Fevang3,8Tone  Wikene NystadTone Wikene Nystad8Kjell Arne  JohanssonKjell Arne Johansson2,9
  • 1School of Health and Medical Sciences, State University of Zanzibar, Zanzibar, Tanzania
  • 2Bergen Center for Ethics and Priority Settings (BCEPS), Department of Global Public Health and Primary Care, Bergen, Norway
  • 3University of Bergen, Department of Clinical Science, Haukeland University Hospital, Bergen, Norway
  • 4Haukeland University Hospital, Department of International Collaboration (DIC), Bergen, Norway
  • 5Department of Internal Medicine, Mnazi Mmoja Hospital, Zanzibar, Tanzania
  • 6Centre for International Health (CIH), Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
  • 7Health Economics Leadership and Translational Ethics Research Group (HELTER), Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
  • 8Department of Rheumatology, Haukeland University Hospital, Bergen, Hordaland, Norway
  • 9Department of Addictive Medicine, Haukeland University Hospital, Bergen, Norway

The final, formatted version of the article will be published soon.

To evaluate the cost effectiveness of six disease modifying anti-rheumatic drug (DMARD) treat-totarget treatment strategies for patients with rheumatoid arthritis in Zanzibar.A Markov model was used to calculate the cost-effectiveness of various DMARD strategies in the treatment of rheumatoid arthritis over a three-year period. A health-provider perspective was used and only outpatient costs were considered. The Clinical Disease Activity Index (CDAI) was utilized for measurement of efficacy and values were obtained from literature. Quality Adjusted Life Years (QALYs) were obtained from 122 patients attending the rheumatology clinic at Mnazi Mmoja Hospital. Data on costs were obtained from the central medical stores and hospital administration. Treatment strategies were given in sequential approach based on treat to target goals of therapy. This included methotrexate monotherapy, methotrexate + sulfasalazine + hydroxychloroquine, methotrexate followed by one or two biologic/targeted-synthetic DMARDs (b/tsDMARDs).Probabilistic and one way sensitivity analysis were performed. Scenario analysis was undertaken comparing drug prices from India and Scandinavia.Costs of therapy/patient/three years ranged from USD 634 for methotrexate monotherapy and USD 5011 for methotrexate and two consecutive b/tsDMARDs. The highest and lowest effects were 2.209 and 2.079 QALYs gained from methotrexate therapy + two consecutive b/tsDMARDs and methotrexate monotherapy, respectively. From a healthcare provider perspective methotrexate monotherapy was the cost-effective option at a willingness to pay of USD 282. Pairwise comparison also favored methotrexate monotherapy as the feasible option. We found that increasing the willingness to pay led to a change in the most acceptable option from methotrexate monotherapy to methotrexate followed by b/tsDMARD. Methotrexate monotherapy is the cost-effective option for the management of rheumatoid arthritis in Zanzibar. Other options may be feasible if the willingness to pay threshold is increased or the drug prices are lowered, particularly for the b/tsDMARDs.

Keywords: cost-effectiveness analysis, zanzibar, Rheumatoid arthritis, DMARDs, biologics

Received: 26 Apr 2025; Accepted: 31 Jul 2025.

Copyright: © 2025 Said, Kühl, Fevang, Nystad and Johansson. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Sanaa S Said, School of Health and Medical Sciences, State University of Zanzibar, Zanzibar, Tanzania

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