Comparison

Exenatide vs. Tirzepatide

Two peptides side-by-side — identity, evidence base, legal status and known adverse events.

Identity

Mechanism of action

Exenatide

Exenatide is a 39-amino-acid peptide with about 53% sequence homology to human GLP-1. A glycine substitution at position 2 prevents dipeptidyl-peptidase-IV cleavage and extends the half-life from native GLP-1 (minutes) to about 2.4 hours. GLP-1 receptor activation glucose-dependently stimulates insulin secretion, inhibits glucagon and delays gastric emptying.

Tirzepatide

Tirzepatide is a 39-amino-acid peptide acting as a dual agonist at the GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide) receptors. Activation of both incretin receptors via G-protein-coupled signalling raises insulin secretion in a glucose-dependent manner, lowers glucagon secretion and delays gastric emptying. Centrally, satiety perception is modulated. A fatty-acid side chain binds to serum albumin and extends the half-life to about five days.

Evidence base

Highest evidence

Human RCT

Studies

of which in humans

Effects recorded

Open conflicts

Documented adverse events

Legal status

Country	Exenatide	Tirzepatide
Switzerland	—	Prescription
Germany	Prescription	Prescription
United States	Prescription	Prescription

Full entries

Frequently asked questions

What is the difference between Exenatide and Tirzepatide?: Exenatide is classified as "Metabolic", while Tirzepatide is classified as "Metabolic". Exenatide: Synthetic version of exendin-4, originally isolated from the saliva of the Gila monster (Heloderma suspectum). First GLP-1 receptor agonist, FDA-approved 2005 as Byetta. Weekly depot form Bydureon approved 2012. Tirzepatide: Synthetic peptide that simultaneously activates the GLP-1 and GIP receptor (dual agonist). Approved in the US and EU for type 2 diabetes (Mounjaro) and obesity (Zepbound). This page contrasts both neutrally and source-based — with no usage or dosing recommendation.
Which peptide is better supported by science, Exenatide or Tirzepatide?: The highest available evidence level is "Human RCT" for Exenatide and "Human RCT" for Tirzepatide. A higher evidence level means more robust data, but says nothing about suitability for an individual. The full body of evidence is on each peptide's own page.
What is the legal status of Exenatide and Tirzepatide in Germany and the United States?: Germany: Exenatide — Prescription, Tirzepatide — Prescription. United States: Exenatide — Prescription, Tirzepatide — Prescription. These are factual summaries with source and review date on the individual pages.

Country

Exenatide

Tirzepatide

Switzerland

—

Prescription

Germany

Prescription

United States

Prescription

Frequently asked questions

What is the difference between Exenatide and Tirzepatide?

Exenatide is classified as "Metabolic", while Tirzepatide is classified as "Metabolic". Exenatide: Synthetic version of exendin-4, originally isolated from the saliva of the Gila monster (Heloderma suspectum). First GLP-1 receptor agonist, FDA-approved 2005 as Byetta. Weekly depot form Bydureon approved 2012. Tirzepatide: Synthetic peptide that simultaneously activates the GLP-1 and GIP receptor (dual agonist). Approved in the US and EU for type 2 diabetes (Mounjaro) and obesity (Zepbound). This page contrasts both neutrally and source-based — with no usage or dosing recommendation.

Which peptide is better supported by science, Exenatide or Tirzepatide?

The highest available evidence level is "Human RCT" for Exenatide and "Human RCT" for Tirzepatide. A higher evidence level means more robust data, but says nothing about suitability for an individual. The full body of evidence is on each peptide's own page.

What is the legal status of Exenatide and Tirzepatide in Germany and the United States?

Germany: Exenatide — Prescription, Tirzepatide — Prescription. United States: Exenatide — Prescription, Tirzepatide — Prescription. These are factual summaries with source and review date on the individual pages.