Mounjaro vs Zepbound: Full Comparison (2026)
How does Mounjaro (Tirzepatide) compare to Zepbound (Tirzepatide)? We break down the weight loss data, pricing, side effects, and who each medication is best suited for.
Mounjaro and Zepbound both contain Tirzepatide but are approved for different uses. Mounjaro is FDA-approved for type 2 diabetes, while Zepbound is FDA-approved for chronic weight management. Zepbound typically produces 20-22% of body weight weight loss vs 15-22% of body weight for Mounjaro. Pricing differs too: $1,023/mo for Mounjaro vs $1,060/mo for Zepbound.
Side-by-Side Comparison
| Feature | Mounjaro | Zepbound |
|---|---|---|
| Active Ingredient | Tirzepatide | Tirzepatide |
| Mechanism | Dual GLP-1/GIP receptor agonist | Dual GLP-1/GIP receptor agonist |
| FDA Approved For | Type 2 diabetes | Chronic weight management |
| Doses | 2.5mg to 15mg (weekly injection) | 2.5mg to 15mg (weekly injection) |
| Administration | Weekly subcutaneous injection | Weekly subcutaneous injection |
| Avg. Weight Loss | 15-22% of body weight | 20-22% of body weight |
| Monthly Price | $1,023 | $1,060 |
| Oral Available | No | No |
| Year Approved | 2022 | 2023 |
Prices reflect typical self-pay costs without insurance. Actual costs vary by pharmacy, location, and insurance plan. Last updated March 2026.
Which Produces More Weight Loss?
Based on clinical data, Zepbound produces more weight loss on average (20-22% of body weight) compared to Mounjaro (15-22% of body weight). Since both contain the same active ingredient, the difference is primarily driven by dosing.
First dual GLP-1/GIP receptor agonist. Approved for type 2 diabetes, used off-label for weight loss. Generally shows greater weight loss than semaglutide alone.
FDA-approved for chronic weight management. Same active ingredient as Mounjaro (tirzepatide). Shows the highest average weight loss of any currently approved GLP-1 medication.
Which Costs Less?
At list price, Mounjaro is the more affordable option at $1,023/month compared to $1,060/month for Zepbound. However, actual out-of-pocket costs depend heavily on your insurance plan. Mounjaro with insurance: $25-$200/month with Lilly savings card. Zepbound with insurance: Varies by plan.
Eli Lilly savings card for eligible patients
LillyDirect program for eligible patients
Side Effects Comparison
Because Mounjaro and Zepbound contain the same active ingredient (Tirzepatide), their side effect profiles are virtually identical. The most common side effects are gastrointestinal:
- Nausea (most common, especially during dose escalation)
- Diarrhea
- Vomiting
- Constipation
- Abdominal pain
- Headache and fatigue (less common)
Side effects tend to be dose-dependent, so whichever medication is taken at a higher dose may cause more intense GI symptoms. Most patients find symptoms improve after the first 4-8 weeks.
Which Should You Choose?
The best choice depends on your diagnosis, insurance coverage, weight loss goals, and personal preferences. Here is our general guidance:
- -You have type 2 diabetes (on-label use, better insurance coverage)
- -Cost is a concern ($1,023/month at list price)
- -You want the dual GLP-1/GIP mechanism for potentially greater efficacy
- -You prefer the convenience of once-weekly dosing
- -Your primary goal is weight loss (FDA-approved indication)
- -You want the dual GLP-1/GIP mechanism for potentially greater efficacy
- -You prefer the convenience of once-weekly dosing
Find the Best GLP-1 Provider for You
Compare verified telehealth programs that prescribe Mounjaro, Zepbound, and other FDA-approved GLP-1 medications.
Frequently Asked Questions
Can I switch from Mounjaro to Zepbound?
Yes, switching between Mounjaro and Zepbound is straightforward since both contain Tirzepatide. Your doctor will typically match your current dose on the new medication's titration schedule. No washout period is needed.
Which is better for weight loss: Mounjaro or Zepbound?
Clinical data suggests Zepbound produces more weight loss on average (20-22% of body weight) compared to Mounjaro (15-22% of body weight). However, individual results vary significantly based on dosing, diet, exercise, and metabolic factors.
Is Mounjaro cheaper than Zepbound?
At list price, Mounjaro ($1,023/month) is less expensive than Zepbound ($1,060/month). With insurance, costs vary significantly. Mounjaro: $25-$200/month with Lilly savings card. Zepbound: Varies by plan.
Do Mounjaro and Zepbound have the same side effects?
Yes, since both contain Tirzepatide, their side effect profiles are virtually identical. The most common side effects are gastrointestinal: nausea, diarrhea, vomiting, and constipation. Side effects tend to be dose-dependent and usually improve after the first few weeks.
Can I take Mounjaro and Zepbound together?
No. You should never take Mounjaro and Zepbound simultaneously because they contain the same active ingredient (Tirzepatide). Combining them could result in a dangerous overdose. Your doctor will prescribe one or the other, never both.
Does insurance cover Mounjaro and Zepbound?
Coverage varies by plan. Mounjaro is FDA-approved for type 2 diabetes — insurance coverage is typically better for on-label use. Zepbound is FDA-approved for chronic weight management. Check with your specific insurance plan and ask your doctor about prior authorization requirements.