Tirzepatide

Dual GIP/GLP-1 receptor agonist · Also known as Mounjaro, Zepbound

What is Tirzepatide?

A dual-action peptide targeting both GIP and GLP-1 receptors. Shows even greater weight loss potential than semaglutide in head-to-head trials.

Tirzepatide represents the next generation of metabolic peptides by acting on two incretin receptors simultaneously. Clinical trials have demonstrated average weight reductions of up to 22.5% of body weight, making it the most effective weight loss peptide currently available.

Key takeaway: Tirzepatide's dual mechanism of action appears to produce greater weight loss than GLP-1-only drugs like semaglutide, with up to 22.5% body weight reduction in clinical trials.

Benefits & evidence

Weight loss High confidence
Blood sugar control High confidence
Insulin sensitivity High confidence
Cardiovascular health Moderate confidence
Liver fat reduction Preliminary confidence

How it works

Unlike semaglutide which only targets GLP-1 receptors, tirzepatide activates both GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 receptors. This dual action enhances insulin sensitivity, reduces appetite through complementary pathways, and may also improve fat metabolism more effectively than targeting either receptor alone.

Dosing information

Typical dosing protocol
Starting dose

2.5 mg/week

Weeks 1-4
Maintenance dose

10-15 mg/week

After titration period

Dose is titrated up every 4 weeks. Maximum approved dose is 15 mg weekly. Follow your prescriber's instructions.

Side effects

Most side effects tend to improve as your body adjusts.

Nausea Common
Diarrhea Common
Decreased appetite Common
Vomiting Moderate
Pancreatitis Rare

Research (71 studies)

Early Adoption and Prescribing Patterns of Resmetirom: A Multi-Institutional National Analysis. Liver international : official journal of the International Association for the Study of the Liver · 2026
Tirzepatide-Induced Liver Injury: A Rare Complication. AACE endocrinology and diabetes · 2026
Endocrinology: What You May Have Missed in 2025. Annals of internal medicine · 2026
Glucagon-Like Peptide-1 Receptor Agonist Utilization Among Sleep Surgery Clinic Patients. Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery · 2026
Glucagon-Like Peptide-1 Receptor Agonists: Their Potential Role in Prediabetes. Diabetes therapy : research, treatment and education of diabetes and related disorders · 2026
Cardiovascular outcomes of glucagon-like peptide-1 receptor agonists: A systematic review. American journal of health-system pharmacy : AJHP : official journal of the American Society of Health-System Pharmacists · 2026
Obesity and Heart Failure: Introducing the Theme. Journal of cardiovascular development and disease · 2026