Zepbound and Wegovy are prescription medicines used with reduced-calorie eating and increased physical activity for eligible people managing weight. The clearest direct comparison found that adults without diabetes lost more weight on average with tirzepatide (Zepbound) than semaglutide (Wegovy) over 72 weeks—but that trial result does not predict an individual’s outcome or determine which medicine is right for them. Their FDA-approved uses, dosage forms, safety considerations, and coverage can also differ.
How are Zepbound and Wegovy different?
| Comparison | Zepbound | Wegovy |
|---|---|---|
| Active ingredient and action | Tirzepatide, which activates GIP and GLP-1 receptors | Semaglutide, which activates GLP-1 receptors |
| Form and schedule | Subcutaneous injection once weekly | Once-weekly injection or oral tablet; each has its own directions |
| Direct weight-loss comparison | Mean body-weight change of −20.2% at week 72 in SURMOUNT-5 | Mean body-weight change of −13.7% at week 72 in SURMOUNT-5 |
| Distinctive U.S. labeled uses | Moderate-to-severe obstructive sleep apnea in adults with obesity, alongside weight management | Specific cardiovascular-risk reduction indication; injection also has pediatric obesity and adult MASH indications under label criteria |
| Cost and coverage | Depends on the patient’s plan, eligibility, pharmacy, and current terms | Depends on the patient’s plan, eligibility, pharmacy, and current terms |
The medicines act on different hormone receptors, but that mechanism alone does not establish which will work best for a particular person. Both are used alongside reduced-calorie eating and increased physical activity, and neither is a direct dose-for-dose substitute for the other.
Which works better for weight loss?
In the 2025 SURMOUNT-5 trial, participants taking tirzepatide had a mean body-weight change of −20.2% at 72 weeks, compared with −13.7% for semaglutide. The trial enrolled adults with obesity or overweight and a weight-related condition who did not have diabetes. It was randomized and open-label, compared maximum tolerated doses, and was funded by Eli Lilly, the manufacturer of tirzepatide. The published SURMOUNT-5 results describe averages for that study population, not a forecast for an individual or proof that the same difference applies to people with diabetes or other populations.
The trial followed participants for 72 weeks; it does not answer which medicine produces better outcomes over longer periods. A prescriber can weigh the evidence against a patient’s health history, treatment goals, response, tolerability, and access.
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What are they approved to treat?
Zepbound: weight management and obstructive sleep apnea
In the United States, Zepbound is used for chronic weight management in eligible adults and is also indicated for moderate-to-severe obstructive sleep apnea (OSA) in adults with obesity. The OSA indication is based on two 52-week trials. FDA identifies positive airway pressure (PAP) as standard care for moderate-to-severe OSA, so patients should not stop PAP or change treatment without their clinician. FDA’s approval announcement describes Zepbound as the first drug treatment option for certain patients with OSA.
Wegovy: weight management and additional label indications
Wegovy’s U.S. label includes weight management for eligible adults. The injection is also indicated for weight reduction in pediatric patients aged 12 and older with obesity, for reducing major cardiovascular events in adults with established cardiovascular disease and overweight or obesity, and—under accelerated approval—for adults with noncirrhotic metabolic dysfunction-associated steatohepatitis (MASH) and fibrosis stages F2–F3. Wegovy tablets have adult weight-management and cardiovascular-risk-reduction indications under specified label criteria. The exact criteria and instructions depend on the formulation; check the current label and discuss eligibility with a prescriber.
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These are differences in labeled indications, not proof that one medicine has no effect on a condition for which it lacks a specific indication. A labeled use applies only to the population and conditions specified in the current U.S. prescribing information.
How do the injection and tablet options work?
Zepbound injection
Zepbound is injected under the skin once a week. The U.S. label starts treatment at 2.5 mg weekly for four weeks, then escalates the dose as tolerated. Listed weight-management maintenance doses are 5 mg, 10 mg, or 15 mg once weekly. A prescriber determines the appropriate dose and escalation; do not convert it to a Wegovy dose.
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Wegovy injection and tablets
Wegovy is available as a once-weekly injection and as an oral tablet. The two presentations have separate titration and administration instructions, so follow the directions for the exact product prescribed rather than assuming that the tablet and injection can be used interchangeably. The labels do not establish a direct dose conversion between Wegovy and Zepbound. Current Zepbound prescribing information and current Wegovy prescribing information provide presentation-specific details.
What safety issues should you compare?
Both U.S. labels carry a boxed warning about thyroid C-cell tumors observed in rodents; whether these tumors occur in humans is unknown. Both medicines are contraindicated for people with a personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2 (MEN 2).
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The labels also warn about potentially serious problems including severe gastrointestinal reactions, kidney injury related to dehydration, gallbladder disease, pancreatitis, hypersensitivity reactions, hypoglycemia in relevant contexts, and aspiration risk around anesthesia or deep sedation. The risks are not identical in every circumstance, and adverse-event rates from separate clinical trials should not be treated as a head-to-head comparison.
Before starting or changing treatment, discuss relevant medical history, other medicines, pregnancy plans, and symptoms with a clinician. The labels also direct against combining these medicines with other products containing the same active ingredient or with other medicines in the relevant class; the prescriber should review the exact regimen.
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How should you choose between them?
There is no universal winner. A clinician can help match the medicine and formulation to the reason for treatment and the patient’s circumstances.
- Ask which labeled indication applies. OSA in an adult with obesity points to a specific Zepbound indication; established cardiovascular disease with overweight or obesity, or certain pediatric obesity and MASH cases, may make a Wegovy indication relevant.
- Consider formulation and routine. Zepbound is a weekly injection. Wegovy offers an injection and an oral tablet, each with its own instructions and eligibility criteria.
- Review individual safety factors. Contraindications, past conditions, current medicines, pregnancy plans, and side effects can change the balance.
- Check the actual cost and coverage. Formularies, prior authorization, eligibility rules, pharmacies, and manufacturer terms can change. Ask the insurer and pharmacy about the exact product and presentation; there is no reliable universal answer about which costs less.
- Set expectations around evidence. SURMOUNT-5 favors tirzepatide for average weight loss in its studied adults without diabetes, but does not predict an individual response or establish equal results in other groups.
What the evidence does not settle
The direct comparison does not establish long-term comparative outcomes beyond its 72-week follow-up, or determine the best treatment for a person with diabetes or a different health profile. Nor does the difference in labeled indications establish that one medicine is broadly safer or more effective for every goal. Coverage and out-of-pocket cost are plan-specific and may change, so verify current terms for your own situation.
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