New Phase 3b data on Lilly's Taltz (ixekizumab) and Zepbound (tirzepatide) advance understanding of the interconnected immune and metabolic biology in adults with psoriasis and obesity
Eli Lilly presented data from the TOGETHER-PsO Phase 3b trial showing that the combination of Taltz (ixekizumab) and Zepbound (tirzepatide) led to broader biomarker changes in psoriasis and metabolic markers compared to Taltz alone. The study involved 274 adults with psoriasis and obesity, with results presented at the 2026 Fall Clinical Dermatology Conference.
How this was made

The 30-second read
Why it matters
The findings highlight a novel immunometabolic link, which could influence future trial designs and therapeutic strategies.
Market read
First‑report data could modestly affect Lilly's stock and signal broader therapeutic opportunities.
What to watch
Potential safety concerns of combined therapy and reimbursement challenges.
Background
Press release from Eli Lilly announcing early biomarker results from the TOGETHER‑PsO trial presented at a dermatology conference.
Ticker impact
Eli Lilly (LLY) presented new Phase 3b exploratory data on the combined use of Taltz and Zepbound, showing broader biomarker changes versus Taltz alone.
likely modest upside as investors price in broader indication potential
First‑report trial insight; no immediate revenue forecast but could drive future sales and partnership interest.
Market effects
May boost biotech focus on combination therapies for metabolic and inflammatory diseases.
U.S. biotech sector could see slight uplift.
Limited to investors tracking Lilly and similar pharma pipelines.
Counterpoint
Data are exploratory; without Phase 3 confirmatory results, market may overreact.
Key entities
- companyEli Lilly and Company
US‑listed pharmaceutical company (NYSE: LLY) conducting the trial.
- drugTaltz (ixekizumab)
IL‑17A monoclonal antibody for psoriasis.
- drugZepbound (tirzepatide)
Dual GIP/GLP‑1 agonist for obesity.

