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TREMFYA dosing in Crohn's disease and ulcerative colitis is given as subcutaneous (SC) injections or IV infusion at Weeks 0, 4, and 8, followed by an SC injection every 8 weeks or every 4 weeks thereafter. Pretreatment evaluations and monitoring are required.1 Please refer to the full Prescribing Information for the complete dosing information.
In both Crohn’s disease and ulcerative colitis, or UC, inflammation can keep coming back like relentless weeds. IL-23, an inflammatory cytokine, is one of the known drivers of inflammation in Crohn’s disease and UC. Blocking IL-23 after it is produced can limit inflammation.after it is produced can limit inflammation. But what if it were possible to block IL-23 inflammation at its cellular source? CD64-positive immune cells are the main producers, and the root source, of IL-23. TREMFYA (guselkumab) is the only dual-acting IL-23 inhibitor. TREMFYA works by BLOCKING IL-23, a cytokine responsible for inflammation, and BINDING to CD64, a receptor on cells that produce IL-23. The clinical significance of these findings is unknown. TREMFYA is an IL-23 blocker indicated for the treatment of adult patients with moderately to severely active Crohn’s disease or moderately to severely active UC. Similar to other IL-23 inhibitors, TREMFYA binds to the p19 subunit of IL-23 and inhibits its interaction with the IL-23 receptor, thereby inhibiting the release of pro-inflammatory cytokines and chemokines. Unlike other IL-23 inhibitors, only TREMFYA is designed with a dual-acting structure that blocks IL-23 and also binds to CD64, a receptor on cells that produce IL-23. Binding to CD64 positions TREMFYA to block IL-23 at its cellular source, allowing it to work at the root of IL-23–driven inflammation. TREMFYA: the only dual-acting IL-23 inhibitor that neutralizes inflammation at its cellular source. Based on in vitro studies in an inflammatory monocyte model. The clinical significance of these findings is unknown.1-3
Get to the root of IL-23 inflammation with TREMFYA: The ONLY dual-acting IL-23i1-3*
TREMFYA works by BLOCKING IL-23, a cytokine responsible for inflammation,2,3 and BINDING to CD64, a receptor on cells that produce IL-233
Based on in vitro studies in an inflammatory monocyte model.2
The clinical significance of these findings is unknown.
CD64+ cells are the predominant source of IL-23 in ulcerative colitis and Crohn’s disese. Cells not expressing CD64 may also contribute to IL-23 production but to a lesser extent.2,4
*“Only” based on approved selective IL-23 inhibitors for moderately to severely active Crohn’s disease or ulcerative colitis as of April 2026.1,5,6
CD64=cluster of differentiation 64; IL-23=interleukin 23; IL-23i=interleukin-23 inhibitor; IV=intravenous; MOA=mechanism of action.
APP=advanced practice provider.
References: 1. TREMFYA [Prescribing Information]. Horsham, PA: Janssen Biotech, Inc. 2. Atreya R, Abreu MT, Krueger JG, et al. Guselkumab, an IL-23p19 subunit-specific monoclonal antibody, binds CD64+ myeloid cells and potently neutralises IL-23 produced from the same cells. Poster presented at: 18th Congress of the European Crohn’s and Colitis Organisation (ECCO); March 1-4, 2023; Copenhagen, Denmark. Poster P504. 3. Sewell GW, Kaser A. Interleukin-23 in the pathogenesis of inflammatory bowel disease and implications for therapeutic intervention. J Crohns Colitis. 2022;16(suppl 2):ii3-ii19. doi: 10.1093/ecco-jcc/jjac034 4. Krueger JG, Eyerich K, Kuchroo VK, et al. IL-23 past, present, and future: a roadmap to advancing IL-23 science and therapy. Front Immunol. 2024;15:1331217. doi: 10.3389/fimmu.2024.1331217 5. Skyrizi® [Prescribing Information]. North Chicago, IL: AbbVie Inc, 2026. 6. Omvoh® [Prescribing Information]. Indianapolis, IN: Eli Lilly and Company, 2025.