Wegovy vs Zepbound: semaglutide and tirzepatide compared
Wegovy (semaglutide) and Zepbound (tirzepatide) are the two leading weekly injections for weight management. They work on related gut hormones, cause similar side effects and are both brand-only, but they differ in how much weight people lose on average, what else they are approved for, and how you can pay for them.
Updated October 3, 2026
At a glance
- How it works
- Wegovy
- Activates the GLP-1 receptor
- Zepbound
- Activates both the GIP and GLP-1 receptors
- How it is taken
- Wegovy
- Weekly injection; a daily Wegovy tablet was approved in December 2025
- Zepbound
- Weekly injection, as pens or single-dose vials
- Other approved uses
- Wegovy
- Lowering heart attack and stroke risk in adults with obesity and heart disease
- Zepbound
- Moderate to severe obstructive sleep apnea in adults with obesity
- Generic available
- Wegovy
- No
- Zepbound
- No
- Ways to pay without insurance
- Wegovy
- NovoCare self-pay program, priced by dose
- Zepbound
- LillyDirect self-pay program, priced by dose
Wegovy semaglutide; also sold as Ozempic and Rybelsus for diabetes | Zepbound tirzepatide; also sold as Mounjaro for diabetes | |
|---|---|---|
| How it works | Activates the GLP-1 receptor | Activates both the GIP and GLP-1 receptors |
| How it is taken | Weekly injection; a daily Wegovy tablet was approved in December 2025 | Weekly injection, as pens or single-dose vials |
| Other approved uses | Lowering heart attack and stroke risk in adults with obesity and heart disease | Moderate to severe obstructive sleep apnea in adults with obesity |
| Generic available | No | No |
| Ways to pay without insurance | NovoCare self-pay program, priced by dose | LillyDirect self-pay program, priced by dose |
Which leads to more weight loss
In SURMOUNT-5, a head-to-head trial in adults with obesity but without diabetes, tirzepatide produced greater average weight loss than semaglutide over 72 weeks, and more people reached large weight-loss targets. Averages hide a wide range: some people lose more on semaglutide than others do on tirzepatide, and tolerability often decides which one a person stays on.
Side effects and safety
Both cause nausea, diarrhea, vomiting and constipation, mostly while the dose is being increased, and both carry the same boxed warning about thyroid C-cell tumors seen in rodents. Both are avoided in people with a personal or family history of medullary thyroid cancer or MEN 2, and both list pancreatitis and gallbladder problems among their warnings.
Cost and coverage
Neither has a generic, so a local pharmacy’s cash price for either brand sits close to the list price. For people paying themselves, the manufacturers’ own programs are usually the route that costs least; for insured people, coverage for weight management varies by plan, and coverage of Ozempic or Mounjaro for type 2 diabetes is far more common. Eligible Medicare Part D enrollees can get Wegovy or the Zepbound pen through the Medicare GLP-1 bridge program until the end of 2027.
Questions for your prescriber
- Given my health history, is one of these a better fit for me?
- Does my plan cover either one for weight management?
- How will we handle side effects while the dose goes up?
- Would the Wegovy tablet suit me better than an injection?
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Sources
- NEJM, tirzepatide versus semaglutide for obesity (SURMOUNT-5)
- DailyMed, FDA-approved prescribing information
- MedlinePlus drug information (National Library of Medicine)
Written by the Script Unlock editorial team from the sources above. It is general information, not advice for you or your pet; your prescriber decides which medicine is right.
Script Unlock is a marketplace that lets licensed pharmacies quote a cash price on your prescription. It does not prescribe, dispense or sell medication, does not process patient payments, and does not give medical advice. Always follow the instructions of your prescriber and pharmacist and read the medication guide supplied with your medicine.