Two Popular Weight Loss Medications
Semaglutide (Wegovy, Ozempic) and tirzepatide (Zepbound, Mounjaro) are two of the most widely used medications for weight loss. Both are weekly injections, and both can lead to significant results. But are they really different?
How They Work
- Semaglutide mimics one hormone: GLP-1, which reduces appetite, slows digestion, and helps regulate blood sugar
- Tirzepatide mimics two hormones: GLP-1 and GIP. This dual action appears to enhance weight loss and blood sugar control
What Head-to-Head Research Shows
In the SURMOUNT-5 trial, which directly compared the two in adults with obesity, people taking tirzepatide lost an average of about 20% of their body weight over 72 weeks, compared with about 14% for semaglutide.
In earlier separate trials:
- Semaglutide 2.4 mg led to about 15% average weight loss
- Tirzepatide's highest dose led to about 21% average weight loss
So on average, tirzepatide produces more weight loss. That said, individual results vary, and some people respond better to one than the other.
Side Effects
Both medications have similar side effects, mostly digestive:
- Nausea
- Diarrhea or constipation
- Vomiting
- Reduced appetite
Side effects are usually strongest when starting or increasing the dose. Both carry warnings about rare risks like pancreatitis and gallbladder problems, and they aren't recommended for people with a personal or family history of certain thyroid cancers.
What About Cost?
Pricing for both medications has changed significantly and varies widely depending on insurance coverage, manufacturer programs, and pharmacy. Neither is consistently cheaper across the board. Insurance coverage for weight loss is still inconsistent, so it's worth checking your options.
Which Is Right for You?
The best choice depends on your goals, health conditions, how you tolerate side effects, cost, and availability. Semaglutide also has proven heart benefits in people with heart disease, which may matter for some patients.
Learn more about provider-guided weight loss options here: Heva Weight Loss
The Bottom Line
Tirzepatide tends to produce more weight loss than semaglutide on average, thanks to its dual-hormone action. But both are effective, and the right choice depends on your individual health, response, and budget.