Feature
Mounjaro
Zepbound
Wegovy
Active Ingredient
Tirzepatide (GLP‑1 + GIP)
Tirzepatide (GLP‑1 + GIP)
Semaglutide (GLP‑1)
FDA Approval
Type 2 diabetes
Chronic weight management
Chronic weight management
Mechanism
Dual receptor agonist
Dual receptor agonist
Single GLP‑1 receptor agonist
Pen & Doses
Single weekly pen, 2.5 → 15 mg
Single weekly pen, 2.5 → 15 mg
Single weekly pen, 0.25 → 2.4 mg
Weight Loss Potential
~20%+ (high doses)
~20%+ (high doses)
~15% average
Notes
Off‑label weight‑loss use
Specifically approved for obesity
Slower escalation, GLP‑1 only
Key Point: Mounjaro and Zepbound are the same drug; the main difference is FDA-approved use. Wegovy works only on GLP‑1 and usually gives slightly less weight loss on average.