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 (186 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
Use of semaglutide and tirzepatide among people with multiple sclerosis. Multiple sclerosis (Houndmills, Basingstoke, England) · 2026
Pharmacological therapy in the obese patient: is it only a matter of fat loss? European heart journal supplements : journal of the European Society of Cardiology · 2026
Tirzepatide and semaglutide: different twins? European heart journal supplements : journal of the European Society of Cardiology · 2026
Obesity Management: Pharmacotherapy. FP essentials · 2026
What obgyns need to know about GLP-1 receptor agonists. Current opinion in obstetrics & gynecology · 2026
Top studies of 2025 relevant to primary care: From the PEER team. Canadian family physician Medecin de famille canadien · 2026
DUAL GIP/GLP-1Ra reduces residual proteinuria in non-diabetic fabry disease. Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association · 2026
[Obesity and type 2 diabetes mellitus (Update 2026)]. Wiener klinische Wochenschrift · 2026
Beyond weight loss: multisystem benefits of obesity medications. The lancet. Diabetes & endocrinology · 2026
GLPs Significantly Decrease the Risk of Postoperative Surgical Complications: A TriNetX Retrospective Cohort Study. Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.] · 2026
The Role of Glucagon-Like Peptide-1 Receptor Agonists in Hair Loss: Clinical Evidence and Proposed Mechanisms. Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.] · 2026
Targeting Inflammation and Fibrosis in Lipedema: The Potential Role of Glucagon-like Peptide-1 Receptor Agonist Therapies. Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.] · 2026
Real-World Effectiveness of Tirzepatide in Japanese Patients with Type 2 Diabetes: A Multicenter Retrospective Observational Study. Diabetes therapy : research, treatment and education of diabetes and related disorders · 2026
High Prevalence and Low Incidence of Constipation Amongst Glucagon-Like Peptide-1 Receptor Agonists Users. Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association · 2026
Tirzepatide in type 1 diabetes: beyond mere weight loss. Expert review of clinical pharmacology · 2026
GLP-1 receptor agonist use and cancer risk in obese nondiabetic adults. Annals of oncology : official journal of the European Society for Medical Oncology · 2026
Benefits of Incretin Therapy on Ovarian Function: A Scientific Literature Review. International journal of molecular sciences · 2026