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Mounjaro vs Wegovy (2026) Updated · 14d ago

Quick answer: Mounjaro (tirzepatide) is FDA-approved for type 2 diabetes. Wegovy (semaglutide) is FDA-approved for chronic weight management. Different mechanisms (dual GIP/GLP-1 vs single GLP-1), different indications. For diabetes Mounjaro typical; for weight loss Wegovy or Mounjaro's weight-loss sibling Zepbound.

Clinically reviewed by Editorial Medical Review, MD, NAMS-CMP · Last updated 2026-05-25

How they work

Mounjaro

Tirzepatide — dual incretin receptor agonist (GIP + GLP-1). Approved for type 2 diabetes; SURPASS trials showed superior A1c reduction vs semaglutide (-2.0% to -2.3% vs -1.86%). Off-label weight loss common before Zepbound approval.

Wegovy

Semaglutide formulated for weight loss. Single GLP-1 receptor agonist. STEP-1 trial: 14.9% mean body weight reduction at 68 weeks. Now FDA-approved for weight management in adults and adolescents.

Available formulations

Mounjaro

  • Subcutaneous injection, single-dose pen, weekly
  • Doses: 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg
  • Indication: type 2 diabetes (adjunct to diet and exercise)

Wegovy

  • Subcutaneous injection, single-dose pen, weekly
  • Doses: 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, 2.4 mg
  • Indication: chronic weight management (BMI ≥30, or ≥27 with comorbidity)

Common questions(3)

Can I use Mounjaro for weight loss instead of Wegovy?

Mounjaro is approved only for type 2 diabetes. Some clinicians prescribe off-label for weight loss, but insurance typically requires Zepbound (same molecule, weight-loss-indicated). If you have both T2D and obesity, Mounjaro may be covered; otherwise Zepbound or Wegovy are preferred.

Which drug produces more weight loss?

In SURMOUNT-5 (2024), tirzepatide produced 20.2% weight loss vs 13.7% for semaglutide over 72 weeks. Tirzepatide-class drugs (Mounjaro, Zepbound) currently lead for weight reduction. Individual response varies.

Are Mounjaro and Wegovy interchangeable?

No. Different active ingredients (tirzepatide vs semaglutide), different mechanisms (dual vs single agonist), different FDA indications. They are not bioequivalent and cannot be substituted at the pharmacy.

Sources(4)

Peer-reviewed and regulatory references. External links open in new tab.