Zepbound vs Wegovy: 5 Key Differences

Updated on Aug 29, 2024 • 5 min read

Key Takeaways

  • Zepbound and Wegovy both help with weight loss. The active ingredient in Zepbound is tirzepatide, while Wegovy uses semaglutide.
  • Studies suggest Zepbound may lead to more significant weight loss compared to Wegovy.
  • Side effects for both medications include nausea, diarrhea, and stomach pain. Wegovy might cause more headaches compared to Zepbound.
  • Zepbound and Wegovy have both received FDA approval for weight loss, but Wegovy has been approved for a wider range of people.

When it comes to weight loss medications, Zepbound and Wegovy are two popular options. Both are designed to help people lose weight, but they may work better for different groups of people. This article will explore the key differences between Zepbound and Wegovy, helping you make an informed decision about which might be right for you.

1. Mechanism of action

Zepbound contains tirzepatide, which is a dual-acting GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1) receptor agonist. These hormones help regulate blood sugar levels and reduce appetite. Tirzepatide mimics the action of both GIP and GLP-1, making it a dual-action medication.

Wegovy, on the other hand, contains semaglutide, which is a GLP-1 receptor agonist. Semaglutide helps with weight loss by slowing down how fast food travels through your digestive tract, making you feel fuller for longer. It also helps release insulin when needed.

Effectiveness of Zepbound vs. Wegovy

When comparing the effectiveness of Zepbound and Wegovy, it's important to note that both medications have shown positive results in clinical trials. However, Zepbound's dual-action mechanism may offer additional benefits in regulating blood sugar levels and reducing appetite. Wegovy's single-action mechanism focuses primarily on slowing gastric emptying and insulin release.

2. Active ingredients

When comparing Zepbound and Wegovy, it's essential to understand their active ingredients. These ingredients are the primary components that make the medications effective.

Zepbound

  • Active Ingredient: Tirzepatide
  • Tirzepatide is a dual glucose-dependent insulinotropic peptide (GIP) and glucagon-like peptide-1 (GLP-1) receptor agonist.
  • It helps in weight loss by enhancing insulin secretion and reducing appetite.

Wegovy

  • Active Ingredient: Semaglutide
  • Semaglutide is a GLP-1 receptor agonist.
  • It aids in weight loss by slowing gastric emptying and reducing hunger.

3. Effectiveness

When comparing the weight loss efficacy of Zepbound and Wegovy, it's important to look at the results from clinical trials and real-world studies. Patients taking the highest dose of Zepbound lost around 21% of their body weight over 72 weeks, while those on Wegovy lost about 15% after 68 weeks.

Effect on weight loss

  • Zepbound: In clinical trials, patients taking Zepbound experienced significant weight loss, with an average reduction of 21% of their body weight over a period of 72 weeks.
  • Wegovy: Patients on Wegovy also saw substantial weight loss, averaging a 15% reduction in body weight over 68 weeks.

Effect on blood sugar

Both Zepbound and Wegovy have shown significant results in weight loss. However, tirzepatide and semaglutide also have beneficial effects on blood glucose levels, making them suitable for individuals with type 2 diabetes.

4. Dosage schedules

Wegovy dosage schedule

Wegovy is administered as a weekly injection with a gradual increase in dosage over several months. The typical schedule is as follows:

  • Weeks 1-4: 0.25 mg once weekly
  • Weeks 5-8: 0.5 mg once weekly
  • Weeks 9-12: 1 mg once weekly
  • Weeks 13-16: 1.7 mg once weekly
  • Week 17 and beyond: 2.4 mg once weekly

Each dose increase requires a new prescription from a healthcare provider.

Zepbound dosage schedule

Zepbound also follows a weekly injection schedule but with different dosage increments. The typical schedule is:

  • Weeks 1-4: 2.5 mg once weekly
  • Weeks 5-8: 5 mg once weekly
  • Weeks 9-12: 7.5 mg once weekly
  • Weeks 13-16: 10 mg once weekly
  • Weeks 17-20: 12.5 mg once weekly
  • Week 21 and beyond: 15 mg once weekly

Similar to Wegovy, each dose increase requires a new prescription.

Note: Both medications require a new prescription for each dose adjustment, emphasizing the need for affordable prescriptions.

5. Getting approved

Zepbound and Wegovy are two FDA-approved weight loss medications. Wegovy is FDA approved for a wider range of people, but your insurance's formulary may only support Zepbound. In general, it's good to at least consider both options.

Zepbound

Currently, the FDA has approved Zepbound for adults who have adopted in a reduced-calorie diet and undertaken increased exercise, who also have a body mass index (BMI) of:

  • 30 kg/m2 or greater, or
  • 27 kg/m2 or greater in the presence of at least one weight-related condition (e.g., hypertension, type 2 diabetes, cardiovascular disease)

Zepbound is currently not approved for use in children or adolescents. It also should not be used in adults with a personal or family history of medullary thyroid cancer or multiple endocrine neoplasia syndrome type 2.

Wegovy

Currently, the FDA has approved Wegovy for:

  • Adults identified as overweight with at least one weight-related health condition
  • Adults identified as either overweight or obese who have cardiovascular disease
  • Children as young as 12 years old who are identified as obese.

Similar to Zepbound, Wegovy should not be used in adults with a personal or family history of medullary thyroid cancer or multiple endocrine neoplasia syndrome type 2.

The bottom line

In summary, both Zepbound and Wegovy offer promising options for weight loss, but they work in different ways and have unique benefits. Zepbound, with its dual-action on GLP-1 and GIP hormones, tends to result in greater weight loss for many people. On the other hand, Wegovy focuses solely on the GLP-1 hormone and is available for a wider age range, including teens. Both medications require weekly injections and have similar side effects, though some people might tolerate one better than the other. Choosing between Zepbound and Wegovy should be a decision made with your healthcare provider, considering your personal health needs, medical history, and insurance coverage. With the right guidance, either of these medications could be a valuable tool in your weight loss journey.

Frequently asked questions

Which medication leads to more weight loss, Zepbound or Wegovy?

Studies suggest that Zepbound may result in more weight loss compared to Wegovy. For example, people taking Zepbound lost about 25% of their body weight in one year, while those on Wegovy lost around 16%.

How often are Zepbound and Wegovy administered?

Both medications are injected under the skin once a week. The dosage increases gradually over several weeks to minimize side effects.

What are the active ingredients in Zepbound and Wegovy?

The active ingredient in Zepbound is tirzepatide, and in Wegovy, it is semaglutide.

Are Zepbound and Wegovy both FDA approved?

Yes, both Zepbound and Wegovy are FDA approved for weight loss. Wegovy was approved in 2021, and Zepbound was approved in 2023.

What are common side effects of Zepbound and Wegovy?

Common side effects for both medications include nausea, diarrhea, and stomach pain. Wegovy might cause more headaches compared to Zepbound.

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Doctor talking to patient about GLP-1 (semaglutide) injectable medications like ozempic, wegovy, zepbound, and mounjaro.