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Peptide

Tirzepatide (Mounjaro/Zepbound)

Tirzepatide is a first-in-class dual GIP/GLP-1 receptor agonist approved by the FDA for type 2 diabetes (Mounjaro) and chronic weight management (Zepbound). It is a 39-amino-acid synthetic peptide based on the native GIP sequence with a C20 fatty diacid modification enabling once-weekly dosing. The SURPASS and SURMOUNT clinical trial programs demonstrated unprecedented efficacy for glycemic control and weight loss, with up to 22.5% body weight reduction.

Research notice. This page is for education and research. Peptides may not be FDA-approved for human use and may only be legally available for research. Talk to a qualified clinician before considering any peptide.

Best evidence
Grade A
Conditions studied
3
Outcomes
16
Graded outcomes
9322

Evidence by condition

  • Strong
  • Moderate
  • Limited
  • Very limited

3 conditions, plus general outcomes

Type 2 Diabetes: outcomes studied for Tirzepatide (Mounjaro/Zepbound)
GradeOutcomeEffectSizeStudiesPeopleStudies list
Weight Loss in Diabetes

SURPASS trials showed 5.4-12.9 kg weight loss in T2DM patients. SURPASS-2 showed tirzepatide 15mg achieved nearly twice the weight loss of semaglutide 1mg.

Improves (the measure goes down)Large effect17 studies

Studies that measured weight loss in diabetes

and 7 more in the citations list

Glycemic Control (HbA1c <7%)

SURPASS-1 showed 87-92% reached HbA1c <7% vs 20% placebo. Up to 52% reached HbA1c <5.7% (normoglycemia).

Changes; see studiesLarge effect12 studies

Studies that measured glycemic control (hba1c <7%)

and 2 more in the citations list

HbA1c Reduction

SURPASS trials showed HbA1c reductions of 1.87-2.58%. SURPASS-2 showed tirzepatide superior to semaglutide 1mg (2.0-2.3% vs 1.86% reduction).

Improves (the measure goes down)Large effect10 studies

Studies that measured hba1c reduction

Beta-Cell Function

SURPASS-1 analysis showed tirzepatide improved markers of beta-cell function and insulin sensitivity as monotherapy.

Improves (the measure goes up)Moderate effect9 studies
Fasting Plasma Glucose

SURPASS trials showed substantial reductions in fasting glucose across all dose levels compared to placebo and active comparators.

Improves (the measure goes down)Large effect9 studies
Obesity: outcomes studied for Tirzepatide (Mounjaro/Zepbound)
GradeOutcomeEffectSizeStudiesPeopleStudies list
Body Weight Reduction

SURMOUNT-1 showed 15-22.5% weight loss vs 3.1% placebo at 72 weeks. SURMOUNT-4 showed 20.9% weight loss maintained with continued treatment.

Improves (the measure goes down)Large effect9 studies
Weight Loss ≥5% Achievement

SURMOUNT-1 showed 89-91% achieved ≥5% weight loss with 10-15mg tirzepatide vs 35% placebo.

Changes; see studiesLarge effect9 studies
Weight Loss ≥20% Achievement

SURMOUNT-1 showed 50-57% achieved ≥20% weight loss with 10-15mg tirzepatide, unprecedented for pharmacotherapy.

Changes; see studiesLarge effect9 studies
Obstructive Sleep Apnea Severity

SURMOUNT-OSA demonstrated significant reduction in sleep apnea severity with tirzepatide in participants with obesity.

Improves (the measure goes down)Large effect7 studies

General

  • Blood Glucose Control: improves
  • Safety/Tolerability: improves
  • Liver Protection: improves
General: outcomes studied for Tirzepatide (Mounjaro/Zepbound)
GradeOutcomeEffectSizeStudiesPeopleStudies list
Blood Glucose Control

29 human trials and systematic reviews support this finding. Evidence includes systematic reviews/meta-analyses. Human clinical trial data available.

Improves (the measure goes down)Moderate effect15 studies

Studies that measured blood glucose control

and 5 more in the citations list

Safety/Tolerability

9 human trials and systematic reviews support this finding. Evidence includes systematic reviews/meta-analyses. Human clinical trial data available.

Improves (the measure goes up)Moderate effect9 studies

Studies that measured safety/tolerability

Liver Protection

3 human trials support this finding. Human clinical trial data available.

Improves (the measure goes up)Small effect5 studies

Studies that measured liver protection

Cardiac Protection

3 human trials support this finding. Human clinical trial data available.

Improves (the measure goes up)Small effect4 studies

Studies that measured cardiac protection

Anti-Cancer Activity

2 human trials and systematic reviews support this finding. Evidence includes systematic reviews/meta-analyses. Human clinical trial data available.

Improves (the measure goes up)Small effect4 studies

Studies that measured anti-cancer activity

Neuroprotection

2 preclinical studies support this finding. Primarily preclinical evidence.

Improves (the measure goes up)Small effect4 studies

Cardiovascular Disease

  • Cardiovascular Outcomes (MACE): improves
Cardiovascular Disease: outcomes studied for Tirzepatide (Mounjaro/Zepbound)
GradeOutcomeEffectSizeStudiesPeopleStudies list
Cardiovascular Outcomes (MACE)

SURPASS-CVOT showed tirzepatide non-inferior to dulaglutide for MACE in patients with T2DM and established cardiovascular disease.

Improves (the measure goes down)Moderate effect5 studies

Studies that measured cardiovascular outcomes (mace)

Key findings

  • Weight Loss in DiabetesType 2 DiabetesImproves (the measure goes down)
  • Glycemic Control (HbA1c <7%)Type 2 DiabetesChanges; see studies
  • HbA1c ReductionType 2 DiabetesImproves (the measure goes down)

Studies cited

51 studies from PubMed

  1. Tirzepatide and health-related quality of life in adults with obesity or overweight: Results from the SURMOUNT-3 phase 3 randomized trialObesity (Silver Spring), 2025 · PMID 40365662
  2. Tirzepatide for reduction of morbidity and mortality in adults with obesity: rationale and design of the SURMOUNT-MMO trialEur Heart J, 2025 · PMID 40545827
  3. Tirzepatide for metabolic dysfunction-associated steatohepatitis: results from phase II clinical trials and perspectives.Expert opinion on investigational drugs, 2025 · PMID 40782123
  4. Efficacy and safety of once-weekly tirzepatide in Japanese patients with obesity disease (SURMOUNT-J): a multicentre, randomised, double-blind, placebo-controlled phase 3 trial.The lancet. Diabetes & endocrinology, 2025 · PMID 40031941
  5. Tirzepatide and Cancer Risk in Individuals with and without Diabetes: A Systematic Review and Meta-Analysis.Endocrinology and metabolism (Seoul, Korea), 2025 · PMID 39814031
  6. Tirzepatide: a novel therapeutic approach for Alzheimer's disease.Metabolic brain disease, 2025 · PMID 40498212
  7. Tirzepatide for Heart Failure with Preserved Ejection Fraction and Obesity.The New England journal of medicine, 2025 · PMID 39555826
  8. The promise of tirzepatide: A narrative review of metabolic benefits.Primary care diabetes, 2025 · PMID 40221292
  9. Continued Treatment With Tirzepatide for Maintenance of Weight Reduction in Adults With Obesity: The SURMOUNT-4 Randomized Clinical TrialJAMA, 2024 · PMID 38078870
  10. Tirzepatide: A Review in Type 2 DiabetesDrugs, 2024 · PMID 38388874
  11. Tirzepatide for the treatment of obstructive sleep apnea: Rationale, design, and sample baseline characteristics of the SURMOUNT-OSA phase 3 trialContemp Clin Trials, 2024 · PMID 38547961
  12. Tirzepatide for Metabolic Dysfunction-Associated Steatohepatitis with Liver Fibrosis.The New England journal of medicine, 2024 · PMID 38856224
  13. Efficacy and safety of tirzepatide, GLP-1 receptor agonists, and other weight loss drugs in overweight and obesity: a network meta-analysis.Obesity (Silver Spring, Md.), 2024 · PMID 38413012
  14. Efficacy and safety of once-weekly tirzepatide for weight management compared to placebo: An updated systematic review and meta-analysis including the latest SURMOUNT-2 trial.Endocrine, 2024 · PMID 38850440
  15. Tirzepatide prevents neurodegeneration through multiple molecular pathways.Journal of translational medicine, 2024 · PMID 38287296
  16. Evidence that tirzepatide protects against diabetes-related cardiac damages.Cardiovascular diabetology, 2024 · PMID 38555463
  17. Tirzepatide as a novel effective and safe strategy for treating obesity: a systematic review and meta-analysis of randomized controlled trials.Frontiers in public health, 2024 · PMID 38356942
  18. Tirzepatide for Weight Reduction in Chinese Adults With Obesity: The SURMOUNT-CN Randomized Clinical Trial.JAMA, 2024 · PMID 38819983
  19. Tirzepatide as Monotherapy Improved Markers of Beta-cell Function and Insulin Sensitivity in Type 2 Diabetes (SURPASS-1)J Clin Endocrinol Metab, 2023 · PMID 37153701
  20. New Drug: Tirzepatide (Mounjaro)Am J Health Syst Pharm, 2023 · PMID 36751934
  21. Tirzepatide for the treatment of obesity: Rationale and design of the SURMOUNT clinical development program.Obesity (Silver Spring, Md.), 2023 · PMID 36478180
  22. Tirzepatide Reduces Appetite, Energy Intake, and Fat Mass in People With Type 2 Diabetes.Diabetes care, 2023 · PMID 36857477
  23. Weight loss efficiency and safety of tirzepatide: A Systematic review.PloS one, 2023 · PMID 37141329
  24. Tirzepatide and potential use for metabolically healthy obesity.European journal of internal medicine, 2023 · PMID 37183081
  25. Efficacy and safety of tirzepatide for treatment of overweight or obesity. A systematic review and meta-analysis.International journal of obesity (2005), 2023 · PMID 37253796
  26. Efficacy and safety of the dual GIP and GLP-1 receptor agonist tirzepatide for weight loss: a meta-analysis of randomized controlled trials.International journal of obesity (2005), 2023 · PMID 37460681
  27. Safety issues of tirzepatide (pancreatitis and gallbladder or biliary disease) in type 2 diabetes and obesity: a systematic review and meta-analysis.Frontiers in endocrinology, 2023 · PMID 37908750
  28. Tirzepatide: Clinical review of the "twincretin" injectable.American journal of health-system pharmacy : AJHP : official journal of the American Society of Health-System Pharmacists, 2023 · PMID 37070418
  29. Tirzepatide once weekly for the treatment of obesity in people with type 2 diabetes (SURMOUNT-2): a double-blind, randomised, multicentre, placebo-controlled, phase 3 trial.Lancet (London, England), 2023 · PMID 37385275
  30. Effect of tirzepatide on blood pressure and lipids: A meta-analysis of randomized controlled trials.Diabetes, obesity & metabolism, 2023 · PMID 37700437
  31. Tirzepatide vs Insulin Lispro Added to Basal Insulin in Type 2 Diabetes: The SURPASS-6 Randomized Clinical Trial.JAMA, 2023 · PMID 37786396
  32. Tirzepatide after intensive lifestyle intervention in adults with overweight or obesity: the SURMOUNT-3 phase 3 trial.Nature medicine, 2023 · PMID 37840095
  33. 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 TrialJAMA, 2022 · PMID 35133415
  34. Tirzepatide, a dual GIP/GLP-1 receptor co-agonist for the treatment of type 2 diabetes with unmatched effectiveness regrading glycaemic control and body weight reductionCardiovasc Diabetol, 2022 · PMID 36050763
  35. Tirzepatide as an Insulin Sensitizer.The Journal of clinical endocrinology and metabolism, 2022 · PMID 34788445
  36. Tirzepatide for Patients With Type 2 Diabetes.JAMA, 2022 · PMID 35133426
  37. Effects of subcutaneous tirzepatide versus placebo or semaglutide on pancreatic islet function and insulin sensitivity in adults with type 2 diabetes: a multicentre, randomised, double-blind, parallel-arm, phase 1 clinical trial.The lancet. Diabetes & endocrinology, 2022 · PMID 35468322
  38. Effect of tirzepatide versus insulin degludec on liver fat content and abdominal adipose tissue in people with type 2 diabetes (SURPASS-3 MRI): a substudy of the randomised, open-label, parallel-group, phase 3 SURPASS-3 trial.The lancet. Diabetes & endocrinology, 2022 · PMID 35468325
  39. Management of type 2 diabetes with the dual GIP/GLP-1 receptor agonist tirzepatide: a systematic review and meta-analysis.Diabetologia, 2022 · PMID 35579691
  40. Tirzepatide, a New Era of Dual-Targeted Treatment for Diabetes and Obesity: A Mini-Review.Molecules (Basel, Switzerland), 2022 · PMID 35807558
  41. Tirzepatide induces a thermogenic-like amino acid signature in brown adipose tissue.Molecular metabolism, 2022 · PMID 35921984
  42. Tirzepatide Once Weekly for the Treatment of Obesity.The New England journal of medicine, 2022 · PMID 36239654
  43. Tirzepatide-Friend or Foe in Diabetic Cancer Patients?Biomolecules, 2022 · PMID 36358930
  44. Tirzepatide cardiovascular event risk assessment: a pre-specified meta-analysis.Nature medicine, 2022 · PMID 35210595
  45. 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.The lancet. Diabetes & endocrinology, 2022 · PMID 36152639
  46. 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 trialLancet, 2021 · PMID 34186022
  47. Tirzepatide versus Semaglutide Once Weekly in Patients with Type 2 DiabetesN Engl J Med, 2021 · PMID 34170647
  48. Dual GIP and GLP-1 Receptor Agonist Tirzepatide Improves Beta-cell Function and Insulin Sensitivity in Type 2 Diabetes.The Journal of clinical endocrinology and metabolism, 2021 · PMID 33236115
  49. GIPR agonism mediates weight-independent insulin sensitization by tirzepatide in obese mice.The Journal of clinical investigation, 2021 · PMID 34003802
  50. 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, phase 3 trial.Lancet (London, England), 2021 · PMID 34370970
  51. 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 (London, England), 2021 · PMID 34672967