Pair page
Retatrutide with Tirzepatide
Mechanism-tag overlap and published literature for Retatrutide and Tirzepatide, pulled verbatim from each Kalios compound profile. Kalios is a literature reference, not a recommendation.
Mechanism overlap
Mechanism tags are verbatim labels on each compound's profile. Generic tags ("peptide", "small-molecule", "research-chemical") are excluded from this overlap view. Tags are descriptive — not an inference about combined effect.
incretin-peptidetriple-receptor-agonist
dual-gip-glp-1-receptor-agonist
Co-administration notes from the literature
Verbatim summary text pulled from each compound's profile data. Researchers studying Retatrutide and Tirzepatide have published these mechanism-level observations. Not a co-administration recommendation.
Next-generation triple GIP/GLP-1/glucagon agonist. Not a concurrent stack — these are alternatives. Patients switching from tirzepatide to retatrutide (via trials) typically do so for greater weight-loss ceiling. Do not co-administer.
Quick facts
Retatrutide
Tirzepatide
Literature table
Classified references from each compound profile. Click a column header to sort. Click a PMID to open PubMed. Findings are quoted verbatim from each profile's literature_summary; nothing here is added or interpreted.
| Year | Compound | Source | Finding |
|---|---|---|---|
| 2025 | Retatrutide | Rosenstock J, et al. Effects of retatrutide on body composition in people with type 2 diabetes: a substudy of a phase 2, double-blind, parallel-group, placebo-controlled, randomised trial. Lancet Diabetes Endocrinol. 2025. PMID: 40609566. PMID 40609566 | human trial, Phase 2 |
| 2024 | Retatrutide | Sanyal AJ, Kaplan LM, Frias JP, et al. Triple hormone receptor agonist retatrutide for metabolic dysfunction-associated steatotic liver disease: a randomized phase 2a trial. Nat Med. 2024;30(7):2037-2048. PMID: 38858523. PMID 38858523 | human trial, Phase 2 |
| 2023 | Retatrutide | Jastreboff AM, Kaplan LM, Frías JP, Wu Q, Du Y, Gurbuz S, Coskun T, Haupt A, Milicevic Z, Hartman ML. Triple-Hormone-Receptor Agonist Retatrutide for Obesity — A Phase 2 Trial. N Engl J Med. 2023;389(6):514-526. PMID: 37366315. DOI: 10.1056/NEJMoa2301972. PMID 37366315 | human trial, Phase 2 |
| 2023 | Retatrutide | Rosenstock J, Frías JP, Jastreboff AM, et al. Retatrutide, a GIP, GLP-1 and glucagon receptor agonist, for people with type 2 diabetes: a randomised, double-blind, placebo and active-controlled, parallel-group, phase 2 trial conducted in the USA. Lancet. 2023;402(10401):529-544.… PMID 37385280 | human trial, Phase 2 |
| 2025 | Retatrutide | Eli Lilly and Company. Topline TRIUMPH-4 readout — retatrutide in adults with obesity and knee osteoarthritis. Press release, October 2025. | human trial |
| 2023 | Retatrutide | Lincoff AM, Brown-Frandsen K, Colhoun HM, et al. Semaglutide and Cardiovascular Outcomes in Obesity without Diabetes (SELECT). N Engl J Med. 2023;389(24):2221-2232. PMID: 37952131. (Comparator reference.) PMID 37952131 | human trial |
| 2022 | Retatrutide | Jastreboff AM, Aronne LJ, Ahmad NN, et al. Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). N Engl J Med. 2022;387(3):205-216. PMID: 35658024. (Comparator reference.) PMID 35658024 | human trial |
| 2021 | Retatrutide | Wilding JPH, Batterham RL, Calanna S, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP-1). N Engl J Med. 2021;384(11):989-1002. PMID: 33567185. (Comparator reference.) PMID 33567185 | human trial |
| — | Retatrutide | Kjeldsen SAS, et al. Retatrutide for the treatment of obesity, obstructive sleep apnea and knee osteoarthritis: Rationale and design of the TRIUMPH registrational clinical trials. PMID: 41090431. PMID 41090431 | human trial |
| — | Retatrutide | ClinicalTrials.gov. A Study of Retatrutide (LY3437943) in Adult Participants Who Have Obesity or Are Overweight With Weight-Related Medical Problems (TRIUMPH-1). NCT05929066. | human trial |
| — | Retatrutide | ClinicalTrials.gov. A Study of Retatrutide (LY3437943) in Adult Participants With Obesity and Type 2 Diabetes (TRIUMPH-2). NCT05929079. | human trial |
| — | Retatrutide | ClinicalTrials.gov. A Study of Retatrutide (LY3437943) in Participants Who Have Obesity or Overweight With Osteoarthritis of the Knee (TRIUMPH-4). NCT05931367. | human trial |
| 2022 | Tirzepatide | Heerspink HJL, Sattar N, Pavo I, Haupt A, Duffin KL, Yang Z, et al. Effects of tirzepatide versus insulin glargine on kidney outcomes in type 2 diabetes in the SURPASS-4 trial: post-hoc analysis of an open-label, randomised, phase 3 trial. Lancet Diabetes Endocrinol. 2022;10(11)… PMID 36152639 | human trial, Phase 3 |
| 2021 | Tirzepatide | Rosenstock J, Wysham C, Frías JP, Kaneko S, Lee CJ, Fernández Landó L, et al.; SURPASS-1 Investigators. Efficacy and safety of a novel dual GIP and GLP-1 receptor agonist tirzepatide in patients with type 2 diabetes (SURPASS-1): a double-blind, randomised, phase 3 trial. Lancet.… PMID 34186022 | human trial, Phase 3 |
| 2021 | Tirzepatide | Ludvik B, Giorgino F, Jódar E, Frias JP, Fernández Landó L, Brown K, et al. Once-weekly tirzepatide versus once-daily insulin degludec as add-on to metformin with or without SGLT2 inhibitors in patients with type 2 diabetes (SURPASS-3): a randomised, open-label, parallel-group,… PMID 34370970 | human trial, Phase 3 |
| 2021 | Tirzepatide | Del Prato S, Kahn SE, Pavo I, Weerakkody GJ, Yang Z, Doupis J, et al.; SURPASS-4 Investigators. Tirzepatide versus insulin glargine in type 2 diabetes and increased cardiovascular risk (SURPASS-4): a randomised, open-label, parallel-group, multicentre, phase 3 trial. Lancet. 202… PMID 34672967 | human trial, Phase 3 |
| 2025 | Tirzepatide | Jastreboff AM, le Roux CW, Stefanski A, Aronne LJ, Halpern B, Wharton S, et al.; SURMOUNT-1 Investigators. Tirzepatide for Obesity Treatment and Diabetes Prevention. N Engl J Med. 2025;392(10):958-971. PMID: 39536238. PMID 39536238 | human trial |
| 2024 | Tirzepatide | Aronne LJ, Sattar N, Horn DB, Bays HE, Wharton S, Lin WY, et al.; SURMOUNT-4 Investigators. Continued Treatment With Tirzepatide for Maintenance of Weight Reduction in Adults With Obesity: The SURMOUNT-4 Randomized Clinical Trial. JAMA. 2024;331(1):38-48. PMID: 38078870. PMID 38078870 | human trial |
| 2024 | Tirzepatide | Malhotra A, Grunstein RR, Fietze I, Weaver TE, Redline S, Azarbarzin A, et al.; SURMOUNT-OSA Investigators. Tirzepatide for the Treatment of Obstructive Sleep Apnea and Obesity. N Engl J Med. 2024;391(13):1193-1205. PMID: 38912654. PMID 38912654 | human trial |
| 2023 | Tirzepatide | Garvey WT, Frias JP, Jastreboff AM, le Roux CW, Sattar N, Aizenberg D, et al.; SURMOUNT-2 Investigators. Tirzepatide once weekly for the treatment of obesity in people with type 2 diabetes (SURMOUNT-2). Lancet. 2023;402(10402):613-626. PMID: 37385275. PMID 37385275 | human trial |
| 2022 | Tirzepatide | Dahl D, Onishi Y, Norwood P, Huh R, Bray R, Patel H, Rodríguez Á. Effect of Subcutaneous Tirzepatide vs Placebo Added to Titrated Insulin Glargine on Glycemic Control in Patients With Type 2 Diabetes: The SURPASS-5 Randomized Clinical Trial. JAMA. 2022;327(6):534-545. PMID: 3513… PMID 35133415 | human trial |
| 2021 | Tirzepatide | Frías JP, Davies MJ, Rosenstock J, Pérez Manghi FC, Fernández Landó L, Bergman BK, et al.; SURPASS-2 Investigators. Tirzepatide versus Semaglutide Once Weekly in Patients with Type 2 Diabetes. N Engl J Med. 2021;385(6):503-515. PMID: 34170647. PMID 34170647 | human trial |
| 2018 | Tirzepatide | Coskun T, Sloop KW, Loghin C, Alsina-Fernandez J, Urva S, Bokvist KB, et al. LY3298176, a novel dual GIP and GLP-1 receptor agonist for the treatment of type 2 diabetes mellitus: From discovery to clinical proof of concept. Mol Metab. 2018;18:3-14. PMID: 30473097. PMID 30473097 | mechanism / discovery |
| 2022 | Tirzepatide | Urva S, Quinlan T, Landry J, Ma X, Martin JA, Benson CT. Effects of hepatic impairment on the pharmacokinetics of the dual GIP and GLP-1 receptor agonist tirzepatide. Clin Pharmacokinet. 2022;61(7):1057-1067. PMID: 35507285. PMID 35507285 | pharmacology |
Related pair pages
More research context
Frequently asked
Have Retatrutide and Tirzepatide been studied together?
Researchers have published mechanistic-level co-administration discussion of Retatrutide and Tirzepatide. No human co-administration trials are catalogued in the Kalios profiles. The pair page lists each compound's classified literature; full citations sit on each individual profile.
What mechanisms do Retatrutide and Tirzepatide share?
Retatrutide and Tirzepatide do not share a specific mechanism tag on their Kalios profiles. They appear on the same pair page because at least one profile lists the other in its co-administration data.
What is the FDA status of Retatrutide and Tirzepatide?
Retatrutide: Investigational (Phase 3). Tirzepatide: Approved (T2D 2022, obesity 2023, OSA 2024). FDA-status text is pulled verbatim from each compound profile. See /fda-pcac-2026.html for the broader FDA Pharmacy Compounding Advisory Committee context.
Where can I find the full research on Retatrutide and Tirzepatide?
Full citation lists, dosing tables from the literature, reconstitution data, and the FDA / WADA status are on the individual compound profiles: the Retatrutide profile and the Tirzepatide profile. The Kalios Stack Research Tool hub lists every compound covered.
Last updated: April 2026