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Zepbound vs. Wegovy: how the two weight-loss medicines compare

Published 2026-11-03 · Editorial team

Medical review pending · Last updated 2026-11-03

Zepbound® and Wegovy® are the two brand-name injectable medicines most often prescribed for chronic weight management in the U.S. They are related but not the same. Zepbound contains tirzepatide (also sold as Mounjaro® for type 2 diabetes). Wegovy contains semaglutide (also sold as Ozempic® for type 2 diabetes). This guide compares the two brands as labeled for weight care. For the molecules themselves, see tirzepatide vs. semaglutide.

Zepbound vs. Wegovy at a glance

Summarized from the FDA-approved prescribing information linked below. Your prescriber sets your dose; do not change it on your own.

How they work

GLP-1 is a gut hormone that helps regulate appetite and blood sugar. Medicines that activate its receptor slow stomach emptying and act on appetite signals in the brain, which can help people eat less. Wegovy works this way. Zepbound also activates the receptor for GIP, a second gut hormone. That dual action is the main difference in how the two medicines work.

Dosing and forms

Both medicines start at a low dose that is raised step by step to help the body adjust, because stomach side effects are most common during dose increases.

• Zepbound is injected under the skin once a week. Per its label, maintenance doses for weight management are 5 mg, 10 mg, or 15 mg weekly, and the maximum is 15 mg.
• Wegovy injection is used once a week. Per its label, the usual maintenance dose is 2.4 mg (1.7 mg is an option), and some adults may later use a higher dose if their prescriber decides it is appropriate.
• Wegovy tablets are taken once a day on an empty stomach with a small sip of water (no more than 4 ounces), waiting 30 minutes before eating, drinking, or taking other oral medicines. The maintenance dose is 25 mg daily.

What studies have shown

Each medicine was approved after large trials showing more weight loss than placebo when combined with diet and activity (the SURMOUNT program for tirzepatide and the STEP program for semaglutide). In 2025, the SURMOUNT-5 trial compared them directly in adults with obesity and without type 2 diabetes. Average weight loss was greater with tirzepatide. That trial was open-label and funded by the maker of tirzepatide. Averages are not predictions: some people lose much more and some lose little on either medicine. Your clinician will set expectations with you.

Side effects and safety

The two medicines share most of their safety profile. The most common side effects are nausea, diarrhea, vomiting, constipation, and stomach pain, usually while the dose is going up. Serious risks listed on both labels include:

• A boxed warning about thyroid C-cell tumors seen in rodents
• Pancreatitis and gallbladder problems
• Low blood sugar, especially with insulin or sulfonylureas
• Kidney problems from dehydration, and severe stomach and intestinal reactions
• Serious allergic reactions, and diabetic eye complications in people with type 2 diabetes
• A risk of food or liquid entering the lungs during anesthesia or deep sedation

There are some label differences. Zepbound can make birth control pills less effective, so its label advises switching to a non-oral method, or adding a barrier method, for 4 weeks after starting and after each dose increase. Wegovy's label lists increased heart rate as a warning and advises stopping it at least 2 months before a planned pregnancy. Neither medicine is for use during pregnancy. See the full important safety information.

What about compounded versions?

Compounded tirzepatide and semaglutide are not FDA-approved and are not the same as Zepbound or Wegovy. FDA has warned about unapproved and counterfeit GLP-1 products sold online. Our program is built around FDA-approved medicines.

Cost and coverage

What you pay depends on your insurance plan, its coverage rules, and the manufacturers' self-pay programs, all of which change often. Ask your plan whether either medicine is covered for weight management and whether prior authorization is required.

How to choose

There is no single best medicine for everyone. A licensed clinician will consider your health history, other conditions such as heart disease or sleep apnea, current medicines, whether you prefer a pill or an injection, side effects, and access. They decide whether either is appropriate, and they monitor you over time.

This article is for education only and is not medical or legal advice. A licensed clinician decides whether any treatment is appropriate for you.