Quick Answer: The main difference is that Wegovy is semaglutide, while Zepbound is tirzepatide. Wegovy is a GLP-1 receptor agonist; Zepbound activates both GIP and GLP-1 pathways. In head-to-head data from SURMOUNT-5, participants on Zepbound lost more weight on average at 72 weeks, but that does not make it the automatic better choice for every person.
Important: Compounded medications are not FDA-approved finished drug products. They are not equivalent to branded drugs like Wegovy, Ozempic, or Zepbound. Compounded GLP-1 medications differ in formulation, regulation, and approval status. Always consult a licensed healthcare provider.
Comparison Table
| Drug | Active Ingredient | Dosing | Official Weight-Loss Result | Common Side Effects |
|---|---|---|---|---|
| Wegovy | Semaglutide | Once-daily pill or once-weekly pen | Adults lost avg 35 lb in 68-week study | Nausea, diarrhea, vomiting, constipation, stomach pain |
| Zepbound | Tirzepatide | Once-weekly injection | 15.0%–20.9% body weight at 72 weeks | Nausea, diarrhea, vomiting, constipation, stomach pain |
What’s Different Mechanistically
Wegovy works through the GLP-1 pathway. Zepbound is a dual-acting medicine that targets both GIP and GLP-1. This mechanistic difference is why people talk about Zepbound as if it is categorically stronger. In the current publicly available head-to-head results, Lilly reports average weight reduction of 20.2% for Zepbound versus 13.7% for Wegovy at 72 weeks in SURMOUNT-5.
Weight-Loss Results
Wegovy’s current materials say adults using Wegovy 2.4 mg pen alongside diet and exercise lost an average of 35 lb over 68 weeks. Lilly’s Zepbound materials report average body-weight reductions of 15.0%, 19.5%, and 20.9% at 72 weeks depending on dose.
Side Effects and Tolerability
Both drugs commonly cause GI side effects. Wegovy lists nausea, diarrhea, vomiting, constipation, stomach pain, headache, fatigue, and related symptoms. Zepbound’s side-effect page lists similar symptoms and notes many GI effects were most common during dose increases and generally decreased over time.
Who Each One Usually Fits Best
Wegovy may be the better choice for those who specifically want semaglutide and a more established GLP-1-only path. Zepbound may appeal more to people whose clinicians think tirzepatide is the stronger fit or who are comparing average weight-loss data closely.
Verdict
If your question is purely “which one has shown more average weight loss?” the answer is Zepbound. If your question is “which one is right for me?” the answer depends on tolerability, access, cost, and clinician guidance.
FAQ
Is Zepbound stronger than Wegovy?
In Lilly’s published head-to-head SURMOUNT-5 results, Zepbound produced greater average weight loss than Wegovy at 72 weeks.
Do Wegovy and Zepbound have the same side effects?
Broadly similar GI side effects are common with both, though exact labeling and patient experience differ.
Is Wegovy available as a pill now?
Current Wegovy brand materials say Wegovy is available as a once-daily pill or once-weekly pen.
Is Zepbound approved for anything besides weight loss?
Lilly says Zepbound is also approved in adults with obesity for moderate-to-severe obstructive sleep apnea.
Insurance coverage for GLP-1 medications varies widely by plan, provider, and medication type. Coverage is not guaranteed.
Pricing last verified: April 2026. GLP-1 telehealth pricing changes frequently — always confirm current rates on each provider’s website.