Tirzepatide
approvedAlso known as: Mounjaro, Zepbound, LY3298176
**Mechanism of Action** Tirzepatide is a synthetic peptide that functions as a dual agonist at the glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors. This unique co-agonism enhances insulin secretion in a glucose-dependent manner, suppresses glucagon release, delays gastric emptying, and promotes satiety. The GIP component is thought to amplify the GLP-1-mediated effects, leading to superior glycemic control and weight reduction compared to selective GLP-1 receptor agonists. **Key Research Findings** Clinical trials (e.g., SURPASS and SURMOUNT programs) demonstrate that tirzepatide significantly reduces HbA1c (up to 2.1–2.4% from baseline) and body weight (up to 15–22% in obesity cohorts) in a dose-dependent manner. Mechanistic studies show enhanced beta-cell function, improved insulin sensitivity, and favorable lipid profiles. Adverse effects are primarily gastrointestinal (nausea, vomiting, diarrhea), with a low risk of hypoglycemia when used without insulin secretagogues. **Clinical Relevance** Approved by the FDA (2022) for type 2 diabetes (Mounjaro) and chronic weight management (Zepbound), tirzepatide represents a first-in-class dual incretin therapy. Its efficacy in reducing cardiovascular risk markers and potential benefits in non-alcoholic steatohepatitis (NASH) are under investigation. Long-term safety data continue to accumulate, with ongoing studies evaluating cardiovascular outcomes. For research purposes only — not medical advice.
Key data
C225H348N48O68Research & studies
Tirzepatide significantly reduced HbA1c by 2.23% compared with placebo at 30 weeks (p<0.0001).; BMI reductions were 7.4% (5 mg) and 11.2% (10 mg) versus 0.4% with placebo at 30 weeks.; Glycaemic efficacy was sustained up to 52 weeks with tirzepatide treatment.; Most common adverse events were gastrointestinal, mild to moderate in severity, with no deaths reported.
Tirzepatide at doses of 5, 10, and 15 mg once weekly was superior to placebo and GLP-1 receptor agonists in reducing weight.; A higher proportion of patients on tirzepatide achieved categorical weight loss of 5%, 10%, and 15% compared to other treatments.; GRADE assessment showed high-certainty evidence for 15% weight loss with tirzepatide, with moderate-to-low certainty for lower thresholds.; Gastrointestinal side effects were similar across tirzepatide doses and GLP-1 RAs but significantly higher than placebo, potentially affecting tolerability.
Tirzepatide led to a mean weight reduction of 20.2% vs. 13.7% with semaglutide at 72 weeks.; Waist circumference decreased by 18.4 cm with tirzepatide vs. 13.0 cm with semaglutide.; More participants on tirzepatide achieved weight reductions of at least 10%, 15%, 20%, and 25%.; Gastrointestinal adverse events were common in both groups, mostly mild to moderate during dose escalation.
Tirzepatide is approved at 5, 10, and 15 mg doses for both type 2 diabetes and chronic weight management.; The SURMOUNT program demonstrates tirzepatide enables many patients to achieve 20% weight loss.; Tirzepatide improves multiple obesity-related complications including sleep apnea, MASH, heart failure with preserved ejection fraction, and diabetes prevention.; Ongoing trials will assess long-term safety, efficacy including cardiovascular outcomes, and cost-effectiveness.
Frequently asked questions
What is Tirzepatide?
**Mechanism of Action** Tirzepatide is a synthetic peptide that functions as a dual agonist at the glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors. This unique co-agonism enhances insulin secretion in a glucose-dependent manner, suppresses glucagon release, delays gastri
How does Tirzepatide work?
Dual GIP/GLP-1 receptor agonist delivering potent glucose lowering and weight reduction.
What is the research status of Tirzepatide?
Tirzepatide is currently classified as approved, with 2,426 research references on record. This is for research purposes only and is not medical advice.
What is the half-life of Tirzepatide?
The reported half-life of Tirzepatide is ~5 days.
What is the molecular weight of Tirzepatide?
Tirzepatide has a molecular weight of approximately 4813 g/mol (formula C225H348N48O68).
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