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Semaglutide vs Tirzepatide

Q: What is the difference between Semaglutide and Tirzepatide?

Semaglutide is a GLP-1 compound (Subcutaneous route) - Long-acting GLP-1 receptor agonist. Once-weekly subcutaneous. Titration over 16 weeks reduces GI side effects. Tirzepatide is a GLP-1 compound (Subcutaneous route) - Dual GIP / GLP-1 receptor agonist. Once-weekly subcutaneous. 20-week titration is the FDA-label maximum-tolerated path.

Q: Which has a longer half-life, Semaglutide or Tirzepatide?

Semaglutide has the longest published plasma half-life (~6.9 days (165 h)), compared with Tirzepatide (~5.0 days (120 h)).

Q: How often is each compound dosed in the research literature?

Semaglutide: once weekly at a published dose range of 0.25–2.4 mg; Tirzepatide: once weekly at a published dose range of 2.5–15 mg. These are descriptive reference parameters, not dosing recommendations.

Q: Can you buy Semaglutide and Tirzepatide for research use?

Yes - Semaglutide, Tirzepatide are available from New-U Research Compounds as lab-verified (>99% HPLC) compounds.

Published pharmacokinetic and receptor-characteristic comparison with primary-source references.

Updated August 2026 Research use only

GLP1-RC-SM

Semaglutide

GLP-1R agonist

GLP-1R

GLP1-RC-TZ

Tirzepatide

Dual receptor agonist

GLP-1R · GIPR

Key research differences

Semaglutide Tirzepatide Receptor profile GLP-1R GLP-1R · GIPR Development status Approved therapeutic molecule Approved therapeutic molecule Published half-life ~6.9 days (165 h) ~5.0 days (120 h) Research distinction Selective GLP-1R agonism Dual incretin agonism

Published research parameters

Semaglutide Ozempic, Wegovy, Rybelsus View Semaglutide → Tirzepatide Mounjaro, Zepbound View Tirzepatide → Receptor profile GLP-1R GLP-1R · GIPR Class GLP-1R agonist Dual receptor agonist Plasma half-life ~6.9 days (165 h) ~5.0 days (120 h) Time to Cmax 24 h 36 h Development status Approved therapeutic molecule Approved therapeutic molecule Study context Regulatory label PK Regulatory label PK Primary publications FDA Wegovy USPI — half-life ~1 week (165 h) (2024) FDA Mounjaro USPI — half-life ~5 days (120 h) (2024) Summary Long-acting GLP-1 receptor agonist. Once-weekly subcutaneous. Titration over 16 weeks reduces GI side effects. Dual GIP / GLP-1 receptor agonist. Once-weekly subcutaneous. 20-week titration is the FDA-label maximum-tolerated path.

View published study parameters

Semaglutide Ozempic, Wegovy, Rybelsus View Semaglutide → Tirzepatide Mounjaro, Zepbound View Tirzepatide → Route in published studies Subcutaneous Subcutaneous Published study interval Once weekly Once weekly Published dose range 0.25–2.4 mg 2.5–15 mg Published study regimen 0.25 → 0.5 → 1 → 1.7 → 2.4 mg 2.5 → 5 → 7.5 → 10 → 12.5 → 15 mg

Source references

FDA Wegovy USPI — half-life ~1 week (165 h)

FDA prescribing information · 2024

FDA Wegovy USPI — half-life ~1 week (165 h) (2024)

STEP 1 trial — NEJM 384:989 (titration schedule)

New England Journal of Medicine · 2021

STEP 1 trial — NEJM 384:989 (titration schedule) (2021)

Hall S et al.

Clinical Pharmacokinetics · 2018

Hall S et al., Clin Pharmacokinet 57:1571 (Cmax ~24 h SC) (2018)

FDA Mounjaro USPI — half-life ~5 days (120 h)

FDA prescribing information · 2024

FDA Mounjaro USPI — half-life ~5 days (120 h) (2024)

SURPASS-2 trial — NEJM 385:503

New England Journal of Medicine · 2021

SURPASS-2 trial — NEJM 385:503 (2021)

Urva S et al.

Clinical Pharmacokinetics · 2022

Urva S et al., Clin Pharmacokinet 61:1057 (Tmax 24–72 h) (2022)

Frequently asked questions

What is the difference between Semaglutide and Tirzepatide?

Which has a longer half-life, Semaglutide or Tirzepatide?

How often is each compound dosed in the research literature?

Can you buy Semaglutide and Tirzepatide for research use?

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