Mounjaro vs Wegovy: 5 Key Differences

Updated on Aug 18, 2024 • 5 min read

Key Takeaways

  • The active ingredient in Mounjaro is tirzepatide, while Wegovy uses semaglutide.
  • Wegovy is FDA approved for weight loss, whereas Mounjaro is approved for treating Type 2 diabetes.
  • Both medications can help you lose weight. Studies suggest that Mounjaro may lead to more weight loss compared to Wegovy.
  • Without insurance, Wegovy is usually more expensive than Mounjaro.
  • Both medications are taken as weekly injections and use the same injection sites (upper arm, abdomen, or thigh).

Mounjaro and Wegovy are two popular medications which can help you lose weight. However, they are approved for treating different health conditions, and they have different costs and side effects. Not sure which one is best for you? Here are 5 key differences to help you decide:

1. How do Mounjaro and Wegovy work?

Mounjaro and Wegovy each rely on different active ingredients. Mounjaro uses tirzepatide, while Wegovy uses semaglutide.

Mounjaro contains tirzepatide

Tirzepatide, the active ingredient in Mounjaro, is a dual GIP and GLP-1 receptor agonist. This means it works on two different receptors in the body to help control blood sugar and promote weight loss. Theoretically, this additional mechanism can lead to better weight loss outcomes and improved blood sugar control.

By activating GLP-1 receptors, Mounjaro slows down gastric emptying, which means food stays in the stomach longer, making you feel full sooner and for a longer period. This helps reduce your appetite. The activation of GIP receptors enhances insulin secretion and helps regulate blood sugar levels.

Wegovy contains semaglutide

Semaglutide, the active ingredient in Wegovy, is a GLP-1 receptor agonist. It helps to regulate appetite and food intake, making it easier for people to lose weight. Semaglutide is also found in another medication called Ozempic, which is used to treat type 2 diabetes and help with weight loss.

Semaglutide works by mimicking the hormone GLP-1. Similar to Mounjaro above, Wegovy slows down gastric emptying, which makes you feel full sooner and helps reduce your appetite.

2. Effectiveness and side effects

Effectiveness for weight loss

When it comes to helping people lose weight, both Mounjaro and Wegovy have shown promising results. Mounjaro has been found to lead to more weight loss compared to Wegovy. In separate studies, Mounjaro demonstrated greater weight loss than semaglutide, the active ingredient in Wegovy. This has been supported by multiple analyses and head-to-head comparisons. However, Wegovy tends to have less intense side effects, especially if you have a sensitive stomach.

It's important to note that both medications, when combined with healthy lifestyle interventions, are effective ways of losing weight. While Mounjaro seems to have the edge in terms of losing weight, you may find Wegovy provides you with better quality of life due to its lower side effects. We recommend you learn about both options. It's always good to have more choices!

Side effects

Mounjaro and Wegovy both operate similarly in your body, so it's not surprising that they share a lot of the same side effects.

The most common side effects reported for both Mounjaro and Wegovy include:

  • Gastrointestinal issues (constipation, diarrhea, gas, bloating, nausea, and/or an upset stomach)
  • Vomiting
  • Headache
  • Tiredness (fatigue)
  • Dizziness
  • Heartburn
  • Runny nose
  • Sore throat

Because Mounjaro also acts on an additional chemical pathway which affects insulin secretion, another reported side effect of Mounjaro can be low blood sugar (hypoglycemia).

Special considerations

  • Wegovy: Women who could become pregnant should use reliable birth control while on the medication. If pregnancy occurs, stop using Wegovy immediately.
  • Mounjaro: Women of childbearing potential should also use effective contraception. If using pill-based birth control, add a barrier method during the first 4 weeks of starting Mounjaro and for 4 weeks after any dose increase. If pregnancy occurs, discontinue Mounjaro immediately.

Both medications should be avoided if you have a personal history of pancreatitis, type 1 diabetes, diabetic retinopathy (a diabetes condition that affects eyesight), or a family history of medullary thyroid cancer or multiple endocrine neoplasia.

Your healthcare provider will guide you on how to properly use these medications, ensuring you get the most benefit from your treatment.

3. Convenience

When it comes to dosage and administration, Mounjaro and Wegovy are fairly similar.

Dosage progression

  • Wegovy: The dosage starts at 0.25 mg per week for the first 4 weeks. It then increases to 0.5 mg for weeks 5-8, 1 mg for weeks 9-12, 1.7 mg for weeks 13-16, and finally 2.4 mg from week 17 onwards.
  • Mounjaro: The initial dose is 2.5 mg per week for the first 4 weeks. After that, it increases to 5 mg for weeks 5-8. If needed, the dose can be increased by 2.5 mg every 4 weeks, up to a maximum of 15 mg.

Injection sites

Both Wegovy and Mounjaro can be injected into the following areas:

  • Upper arm
  • Abdomen
  • Thigh

4. Cost

Without insurance, Wegovy generally costs more than Mounjaro. Mounjaro usually costs between $1,000 to $1,200 per month, while Wegovy usually costs between $1,300-$1,600 per month before insurance.

We've helped patients obtain insurance coverage for both of these medications. Some of our customers have emailed us to say they now pay as little as a $25 monthly copay for their monthly supply.

5. Insurance coverage

Both Mounjaro and Wegovy are FDA approved medications, but they are approved for treating different health conditions. The short answer is that Mounjaro is approved for treating Type 2 diabetes, and Wegovy is approved for weight loss.

Mounjaro

Mounjaro is approved for the treatment of adults with Type 2 diabetes. It helps manage blood sugar levels effectively.

Wegovy

Wegovy is approved for use in individuals with obesity, particularly those with a body mass index (BMI) of 30 or higher, or those with a BMI of 27 or higher who have at least one weight-related condition, such as high blood pressure or type 2 diabetes.

The bottom line

In summary, while both Mounjaro and Wegovy are effective in aiding weight loss, Mounjaro is FDA approved for treating Type 2 Diabetes, while Wegovy is FDA approved as a weight loss drug. Mounjaro, with its dual-action mechanism, tends to result in greater average weight loss compared to Wegovy.

However, studies suggest that Wegovy produces less side effects, especially for people with sensitive stomachs. Both medications require a long-term commitment and should be used under the guidance of a healthcare provider. It's essential to discuss with your doctor to determine which medication aligns best with your health needs and lifestyle.

Frequently asked questions

How do Mounjaro and Wegovy work?

Mounjaro contains tirzepatide, while Wegovy contains semaglutide. Both medications mimic hormones that control hunger. Mounjaro activates GLP-1 and GIP receptors, while Wegovy only activates GLP-1 receptors.

Which medication is more effective for weight loss, Mounjaro or Wegovy?

Studies suggest that Mounjaro may lead to more weight loss compared to Wegovy. On average, people using Mounjaro lost about 25% of their body weight in a year, while Wegovy users lost around 16%.

Which medication is easier to use?

Both Mounjaro and Wegovy are easy to use. Each medication requires that you inject yourself once a week. The only real difference is that Wegovy stays stable at room temperature for slightly longer (28 days for Wegovy vs. 21 days for Mounjaro). Despite this, we recommend that you store both drugs in your fridge.

What are the approved uses for Mounjaro and Wegovy?

Wegovy is approved for weight management in adults and children aged 12 and older. Mounjaro is approved for adults 18 and older to manage blood sugar levels in type 2 diabetes.

Can I switch between Mounjaro and Wegovy?

Switching between these medications is possible but should be done under a doctor's guidance to ensure it's safe and effective for you.

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