Ozempic and Mounjaro are two of the most popular GLP-1 medications. They work differently and come from different companies.
Here's what you need to know to compare them.
Quick Comparison
| Ozempic | Mounjaro | |
|---|---|---|
| Active drug | Semaglutide | Tirzepatide |
| Drug class | GLP-1 agonist | Dual GIP/GLP-1 agonist |
| FDA approval | Type 2 diabetes | Type 2 diabetes |
| Dose range | 0.25 mg – 2 mg | 2.5 mg – 15 mg |
| Injection | Once weekly | Once weekly |
| Maker | Novo Nordisk | Eli Lilly |
How They Work
Ozempic mimics one hormone (GLP-1) that tells your brain you're full and slows your stomach.
Mounjaro mimics two hormones (GLP-1 and GIP). Two signals instead of one. That's why some people see stronger results.
Weight Loss Results
In clinical trials:
- Ozempic: About 10-15% body weight loss at max dose
- Mounjaro: About 15-22% body weight loss at max dose
Mounjaro tends to produce more weight loss on average. But averages don't tell the whole story — your body may respond differently.
Side Effects
Both cause similar side effects:
| Side Effect | Ozempic | Mounjaro |
|---|---|---|
| Nausea | Common | Common |
| Diarrhea | Common | Common |
| Constipation | Common | Common |
| Vomiting | Less common | Less common |
| Stomach pain | Less common | Less common |
| Decreased appetite | Very common | Very common |
Side effects are usually worst when you start and after dose increases. Most people adjust within a few weeks.
Some people find Mounjaro harder on the stomach because it hits two hormone receptors. Others find it easier. It varies person to person.
Cost
Ozempic:
- List price: ~$900-1,000/month
- Often covered for diabetes
- Rarely covered for weight loss alone
Mounjaro:
- List price: ~$1,060/month
- Covered for diabetes
- Not usually covered for weight loss (use Zepbound instead)
Check your insurance formulary. That will likely decide this for you.
Who Should Choose Ozempic?
- You have type 2 diabetes
- You've used semaglutide before and it works
- Your insurance covers it
- You prefer a medication with a longer track record
Who Should Choose Mounjaro?
- You want the option of stronger weight loss
- You tried semaglutide and didn't get the results you wanted
- Your insurance covers it
- Your doctor recommends tirzepatide for your situation
Can You Switch?
Yes. Some people start on Ozempic and switch to Mounjaro if they hit a plateau or want more weight loss. You'll start at the lowest Mounjaro dose and work up.
Bottom Line
Mounjaro tends to produce more weight loss because it uses two hormones instead of one. But Ozempic has been around longer and works well for millions of people.
The best medication is the one you can afford, tolerate, and stay on. Talk to your doctor about which makes sense for you.
Work with your healthcare provider to determine which medication is right for you. Individual results and experiences vary.