--- title: "Apraglutide: The Once-Weekly GLP-2 Peptide for Short Bowel Syndrome — and Why the FDA Wants One More Trial (June 30, 2026) | PepTracker Pro Blog" description: "Apraglutide is a once-weekly GLP-2 analog that helps the remaining gut absorb more in short bowel syndrome — the least frequent dosing of any drug in its class. Its Phase 3 STARS trial worked, but in 2026 it still needs an FDA-required confirmatory trial. Here is where it stands." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Organization", "name": "PepTracker Pro", "url": "https://peptrackerpro.com", "logo": "https://peptrackerpro.com/favicon.png", "description": "Evidence-based educational resource dedicated to improving peptide research literacy.", "contactPoint": { "@type": "ContactPoint", "email": "hello@peptrackerpro.com", "contactType": "customer support" }, "sameAs": [] }, { "@context": "https://schema.org", "@type": "Article", "headline": "Apraglutide: The Once-Weekly GLP-2 Peptide for Short Bowel Syndrome — and Why the FDA Wants One More Trial (June 30, 2026)", "description": "Apraglutide is a once-weekly GLP-2 analog that helps the remaining gut absorb more in short bowel syndrome — the least frequent dosing of any drug in its class. Its Phase 3 STARS trial worked, but in 2026 it still needs an FDA-required confirmatory trial. Here is where it stands.", "datePublished": "2026-06-30", "dateModified": "2026-06-30", "author": { "@type": "Organization", "name": "PepTracker Pro Research Team", "url": "https://peptrackerpro.com" }, "publisher": { "@type": "Organization", "name": "PepTracker Pro", "logo": { "@type": "ImageObject", "url": "https://peptrackerpro.com/favicon.png" } }, "mainEntityOfPage": { "@type": "WebPage", "@id": "https://peptrackerpro.com/blog/apraglutide-once-weekly-glp2-analog-short-bowel-syndrome-stars-ironwood-june-30-2026" } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://peptrackerpro.com" }, { "@type": "ListItem", "position": 2, "name": "Blog", "item": "https://peptrackerpro.com/blog" }, { "@type": "ListItem", "position": 3, "name": "Apraglutide: The Once-Weekly GLP-2 Peptide for Short Bowel Syndrome — and Why the FDA Wants One More Trial (June 30, 2026)", "item": "https://peptrackerpro.com/blog/apraglutide-once-weekly-glp2-analog-short-bowel-syndrome-stars-ironwood-june-30-2026" } ] } ] --- [Skip to main content](#main) **Educational information only.** This site does not provide medical advice. [Read full disclaimer](/disclaimer) [PepTracker Pro](/) [Home](/)[Peptides](/peptides)[Compare](/compare)[Glossary](/glossary)[Blog](/blog)[Calculators](/calculators)[Start Here](/start) [Open the App](https://app.peptrackerpro.com) [Blog](/blog)/ Apraglutide: The Once-Weekly GLP-2 Peptide for Short Bowel Syndrome — and Why the FDA Wants One More Trial (June 30, 2026) Research & Compounds Research & Compounds # Apraglutide: The Once-Weekly GLP-2 Peptide for Short Bowel Syndrome — and Why the FDA Wants One More Trial (June 30, 2026) PepTracker Pro Research Team June 30, 2026 8 min read ## Table of Contents - [Another gut peptide, an even longer reach](#section-0) - [Why once-weekly is the headline](#section-1) - [How it works](#section-2) - [The evidence: the STARS trial](#section-3) - [The catch: the FDA wants one more trial](#section-4) - [Where it fits — and the honest caveats](#section-5) ## Another gut peptide, an even longer reach A few days ago we covered glepaglutide, a long-acting GLP-2 analog for short bowel syndrome. Apraglutide is its closest cousin — and it pushes the same idea one step further on dosing. GLP-2 is the hormone the intestine releases after eating to grow and maintain its absorptive lining. Apraglutide (FE 203799), developed by Ironwood Pharmaceuticals, is a synthetic GLP-2 analog engineered for short bowel syndrome with intestinal failure (SBS-IF), where people who have lost much of their small intestine cannot absorb enough nutrition and depend on intravenous (parenteral) feeding. ## Why once-weekly is the headline What sets apraglutide apart is how rarely it needs to be injected. A four-amino-acid substitution in the natural GLP-2 sequence makes it resistant to the DPP-4 enzyme that normally chews up the hormone and increases how tightly it binds to blood proteins. The result is a half-life of about 72 hours — long enough for once-weekly subcutaneous dosing. For comparison, the first approved GLP-2 drug, teduglutide (Gattex/Revestive), has a half-life of only a few hours and must be injected every day; glepaglutide sits in between at twice weekly. For patients already managing nightly IV nutrition, fewer injections is a real quality-of-life difference. ## How it works Apraglutide is a GLP-2 receptor agonist. By switching on GLP-2 receptors in the bowel, it prompts the intestinal lining to grow taller villi and more absorptive surface, increases blood flow to the gut, and slows transit so there is more time to absorb fluid and nutrients. The goal is the same as every short bowel therapy: get the remaining intestine to absorb more, so patients can cut back — or eliminate — their IV support. ## The evidence: the STARS trial In the pivotal Phase 3 STARS trial, 164 adults with SBS-IF were randomized 2:1 to once-weekly apraglutide or placebo, grouped by intestinal anatomy (stoma versus colon-in-continuity). Apraglutide cut weekly parenteral support volume by about 25.5% at 24 weeks, versus 12.5% on placebo. The effect was especially strong in patients with colon-in-continuity — the group whose remaining colon can respond most to GLP-2. And across the long-term extension, 27 apraglutide-treated patients reached enteral autonomy, meaning they no longer needed parenteral support at all. ## The catch: the FDA wants one more trial Despite the positive trial, the path to market hit a wall. In April 2025 the FDA told Ironwood that it would need a confirmatory Phase 3 trial before approval, after concern that the drug exposure actually delivered in STARS was lower than intended because of how the dose was prepared and administered. The agency said STARS data would remain an integral part of the eventual application, and Ironwood planned to begin the new trial in 2026 — but also acknowledged it was weighing strategic options for the program. So as of mid-2026, apraglutide is not approved: it has strong Phase 3 data and a clear mechanism, but a confirmatory study stands between it and the clinic. ## Where it fits — and the honest caveats Apraglutide rounds out a small but real class of intestinotrophic GLP-2 peptides: daily teduglutide (approved), twice-weekly glepaglutide (under EU review, FDA wants more data), and once-weekly apraglutide (FDA wants a confirmatory trial). All of them stimulate gut tissue to grow, which is exactly the point in short bowel syndrome but also the reason they require monitoring for intestinal polyps and careful attention to the gallbladder, pancreas and fluid balance. Two caveats belong on any 2026 write-up: this is an investigational, prescription-only drug for a specific rare disease under specialist care — not a wellness compound and not something sold legitimately by 'research peptide' vendors — and it is not approved, with its U.S. future riding on one more trial. Ready to track your peptide research? [Open PepTracker Pro](https://app.peptrackerpro.com) PepTracker Pro Research Team The PepTracker Pro Research Team is an editorial group of science writers, pharmacologists, and clinical researchers dedicated to making peptide science accessible. Every article is reviewed for accuracy against peer-reviewed sources and updated as new evidence emerges. ## Citations 1. \[1\] Efficacy and Safety of Once-Weekly Apraglutide in SBS-IF: Phase 3 STARS Study — Intestinal Failure journal [Source](https://www.intestinalfailurejournal.org/article/S2950-4562\(25\)00043-0/fulltext) 2. \[2\] Ironwood Provides Clinical and Regulatory Update on Apraglutide (FDA requires confirmatory Phase 3) — April 2025 [Source](https://www.businesswire.com/news/home/20250414687154/en/Ironwood-Pharmaceuticals-Provides-Clinical-and-Regulatory-Update-on-Apraglutide) 3. \[3\] Ironwood rethinks options after FDA demands another phase 3 trial — Fierce Biotech [Source](https://www.fiercebiotech.com/biotech/ironwood-rethinks-options-after-fda-demands-another-phase-3-trial-gi-drug) 4. \[4\] Apraglutide once-weekly GLP-2 analog improves intestinal absorption — Phase 1/2 metabolic balance trial (PMC) [Source](https://pmc.ncbi.nlm.nih.gov/articles/PMC9545924/) **Disclaimer:** This article is for educational purposes only and does not constitute medical advice. 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