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Eloralintide

B
lead outcome
Weight loss / obesity
grades vary by outcome ↓
Peptide
also called — Eloralintide · LY3841136 (Lilly development code)
weight management / obesityselective amylin-receptor agonism (satiety)cardiometabolic improvementcombination-ready (with incretins)

The amylin that hit incretin-level weight loss — and rewrote the class's market lesson. Eloralintide (Lilly) closes the register's amylin lineage on a high note, and it comes with a genuinely beautiful backstory. Three threads: (1) the amylin origin story — the whole class descends from a mysterious

In brief

Eloralintide (Lilly's LY3841136) is a once-weekly, selective amylin-receptor agonist — and it closes the register's amylin story with the class's strongest monotherapy data yet. The amylin lineage has a lovely origin: the hormone was discovered as the mysterious amyloid "junk" clogging diabetics' pancreases for a century, which turned out to be a third islet hormone that signals fullness (co-secreted with insulin). Eloralintide's Phase 2 (Lancet, 2025) delivered up to ~20% mean weight loss over 48 weeks (range 9.5–20.1% vs 0.4% placebo) — incretin-class numbers from a non-incretin mechanism — with generally good tolerability (GI/fatigue AEs dose-dependent; placebo-like at lower doses). That result matters beyond the drug: arriving just after Petrelintide (#69) — whose ~10.7% disappointed the market — eloralintide shows the amylin class can reach the top tier, so efficacy magnitude, not just tolerability, is the real battleground. Lilly went straight to Phase 3 and is testing an eloralintide + tirzepatide combination. The honest read: a standout Phase 2 for a selective amylin agonist — high efficacy, good tolerability — but still investigational, Phase 3 pending, and (as Petrelintide showed) mid-stage promise isn't approval.

Legal standing, by region
European Union
Not FDA-approved (gray-market)

investigational; not approved. Phase 2 complete → Phase 3 enrolling (obesity). A well-capitalized Lilly clinical program, not a gray-market compound.

Evidence, by outcome

An honest grade per outcome — drawn from the evidence, not any catalogue. Hype and undemonstrated marketing claims grade low.

OutcomeEvidence base · effectGrade
Weight loss / obesity
Standout Phase 2 — highest amylin-monotherapy weight loss reported — but not yet Phase 3-confirmed; predominantly female cohort (78%)
Phase 2, Lancet 2025 (263 pts, 48 wk): up to 20.1% (−21.3 kg) vs 0.4% placebo; dose-dependent; Phase 1 ~11%/12 wk
B
Tolerability
Strong — but the highest-efficacy (highest-dose) arms had more AEs; escalation protocol matters
GI + fatigue AEs, dose-dependent; similar to placebo at; slower escalation helped
A
Cardiometabolic risk factors
Consistent secondary benefits; Phase 2 level
Improvements in waist, BP, lipids, glycemia, inflammation
B
Combination with tirzepatide
No combination efficacy data yet
Trial ongoing (LY3841136 + tirzepatide)
Safety
No unexpected signals; investigational — Phase 3/long-term safety pending
Phase 2 (263) + Phase 1
B

Identity a synthetic, selective agonist of the amylin receptor, engineered for once-weekly subcutaneous dosing, from Eli Lilly. Lilly emphasizes "molecule specificity" — eloralintide is designed to hit the amylin receptor cleanly/selectively (rather than a broad multi-receptor sweep), the company's bet on precision within this class. ## Mechanism (as proposed) like all amylins, eloralintide engages amylin receptors (AMY = calcitonin receptor + RAMP) concentrated in the hindbrain area postrema / NTS and hypothalamic circuits, producing satiety, delayed gastric emptying, and glucagon suppression — making people eat less and feel full sooner. Its distinguishing design is selectivity for the amylin receptor (Lilly's "molecule specificity" thesis), aiming for a clean amylin signal. Because this pathway is entirely separate from GLP-1/GIP incretins, it can serve as an alternative (for people who don't tolerate incretins) or a complement (stacked with tirzepatide). As with the whole class, the molecule is engineered to avoid the amyloid fibrillation that makes native amylin toxic — the direct legacy of amylin's "discovered-as-toxic-amyloid" origin.

Sources — 4 cited
01Bailey et al. Eloralintide, a selective amylin receptor agonist for the treatment of obesity: a 48-week phase 2… trial. The Lancet, 2025 (NCT06230523; up to 20.1% / −21.3 kg vs 0.4% placebo; tolerability).
02Eli Lilly press release (6 Nov 2025): Phase 2 results; 9.5–20.1% weight loss; cardiometabolic improvements; Phase 3 enrollment beginning; "molecule specificity" (Kenneth Custer).
03Amylin discovery/history: Cooper GJ et al. PNAS 1987; Westermark P et al. 1986–1987 (IAPP isolation from islet amyloid); "islet hyalinization" 1900 → amyloid identification → third islet hormone; fibrillation/toxicity → engineered non-aggregating analogs.
04Combination study: LY3841136 + tirzepatide (ClinicalTrials.gov). (Investigational; not approved as of 2026.)
Review status
Not yet reviewed

A credentialed reviewer (PharmD / PhD / MD) will be named before this entry is finalised. Until then, treat it as a working draft. Last updated July 2026 (Phase 3 obesity enrolling; eloralintide + tirzepatide combination and Phase 3 readouts are the catalysts — and the real test of whether ~20% holds at scale).

Grades reflect the published evidence, not our interest. No dosing, reconstitution, or administration is published for research compounds — that restraint is deliberate.

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Eloralintide — the selective amylin agonist with ~20% weight loss: the amylin story and what it means for the class · Vallydia