Which Has Worse Side Effects: Wegovy or Mounjaro?

Reading time
7 min
Published on
August 4, 2025
Updated on
September 11, 2025
Which Has Worse Side Effects: Wegovy or Mounjaro?

Introduction

When it comes to weight loss medications, understanding the potential side effects is crucial for making informed decisions. With a growing number of individuals seeking effective solutions for weight management, two of the most talked-about medications are Wegovy and Mounjaro. These injections have gained popularity for their effectiveness, but as with any treatment, side effects are a significant consideration. In this post, we will explore the side effects of Wegovy and Mounjaro, comparing their profiles to determine which may have worse side effects.

Over the past few years, the obesity epidemic has reached alarming levels in the United States, with over 42% of adults classified as obese. This statistic highlights the need for effective weight management solutions that prioritize safety and efficacy. As more people embark on their weight loss journeys, medications like Wegovy and Mounjaro are becoming increasingly popular options. Both medications belong to a class of drugs known as GLP-1 receptor agonists, which mimic hormones that regulate appetite and glucose metabolism.

However, understanding the side effects of these medications is essential for anyone considering them. Clinical trials have shown that while both Wegovy and Mounjaro can facilitate weight loss, they come with varying side effects and tolerability among users. By the end of this post, we aim to provide a thorough comparison of the side effects associated with Wegovy and Mounjaro, helping readers make informed choices about their weight management options.

In this article, we will cover the following topics:

  1. Overview of Wegovy and Mounjaro
  2. Common and Serious Side Effects
  3. Comparative Analysis of Side Effects
  4. Factors Influencing Side Effects
  5. Conclusion and Final Thoughts
  6. FAQ Section

Let’s dive into the details to better understand how these medications work and their respective side effects.

Overview of Wegovy and Mounjaro

Wegovy

Wegovy, which contains the active ingredient semaglutide, is specifically approved by the FDA for chronic weight management in adults and children aged 12 and older with obesity or overweight conditions. It works by mimicking the GLP-1 hormone, which helps regulate appetite and caloric intake. Wegovy is typically administered as a subcutaneous injection once a week, with a gradual increase in dosage depending on individual tolerance and needs.

Mounjaro

Mounjaro, on the other hand, contains tirzepatide and is primarily approved for the treatment of type 2 diabetes. However, it is often prescribed off-label for weight loss due to its effectiveness in promoting weight reduction. Mounjaro is unique as it acts as a dual agonist, targeting both GLP-1 and GIP receptors, which may enhance its appetite-suppressing effects. Like Wegovy, Mounjaro is administered via injection once a week.

Both medications have shown promising results in clinical trials for weight loss, but their side effect profiles warrant careful consideration.

Common and Serious Side Effects

Wegovy Side Effects

In clinical studies, Wegovy has been associated with several common and serious side effects, including:

Common Side Effects

  • Nausea: Reported by up to 44% of users.
  • Diarrhea: Affects around 30% of users.
  • Constipation: Occurs in about 24% of users.
  • Vomiting: Experienced by approximately 24% of participants.
  • Headache: Reported by about 14% of users.

Serious Side Effects

  • Pancreatitis: Inflammation of the pancreas, which can be severe.
  • Kidney issues: Including acute kidney injury.
  • Thyroid tumors: There is a boxed warning for potential thyroid cancer.
  • Serious allergic reactions: Such as swelling or difficulty breathing.

Mounjaro Side Effects

Mounjaro has a similar side effect profile, but the incidence rates differ:

Common Side Effects

  • Nausea: Reported by approximately 12% of users.
  • Diarrhea: Affects around 8% of users.
  • Indigestion: Occurs in about 8% of users.
  • Constipation: Reported by about 6% of users.
  • Stomach pain: Experienced by approximately 6% of participants.

Serious Side Effects

  • Pancreatitis: Similar to Wegovy, there is a risk of severe inflammation of the pancreas.
  • Thyroid cancer risk: Like Wegovy, Mounjaro carries a boxed warning for potential thyroid tumors.
  • Severe allergic reactions: Such as anaphylaxis, though rare.

Comparative Analysis of Side Effects

When comparing the side effects of Wegovy and Mounjaro, several key differences emerge:

Frequency of Side Effects

  • Nausea: Wegovy users report nausea significantly more frequently (44%) compared to Mounjaro users (12%). This suggests that individuals may tolerate Mounjaro better in the initial stages of treatment, where nausea is most common.
  • Diarrhea and Constipation: Similar trends appear with diarrhea, where Wegovy has a higher incidence (30%) compared to Mounjaro (8%). Constipation rates are also lower with Mounjaro (6%) versus Wegovy (24%).

Severity of Side Effects

  • Gastrointestinal Effects: Wegovy’s gastrointestinal side effects can be more pronounced and may lead to discontinuation of treatment in some patients.
  • Serious Side Effects: Both medications share serious side effects, such as the risk of pancreatitis and thyroid tumors. However, the overall incidence and severity may vary based on individual health conditions and responses to the medication.

Overall Tolerability

Given the data, Mounjaro appears to have a more favorable side effect profile, particularly concerning nausea and gastrointestinal issues. However, individual responses can vary significantly, and what works for one person may not work for another.

Factors Influencing Side Effects

Several factors can influence the side effects experienced by individuals taking Wegovy or Mounjaro:

Dosage and Administration

Both medications are titrated to allow individuals to adjust to their effects gradually. Starting on a lower dose and increasing it can help minimize side effects.

Individual Health Conditions

Pre-existing health conditions, such as a history of pancreatitis or thyroid issues, can affect how a person reacts to these medications. It’s essential to discuss your medical history with a healthcare provider before starting treatment.

Combination with Other Medications

Interactions with other prescriptions or supplements can amplify side effects or diminish the effectiveness of weight loss medications. Always inform your healthcare provider of all medications you are taking.

Lifestyle Factors

Diet, exercise, and overall lifestyle choices can also impact the effectiveness and tolerability of Wegovy and Mounjaro. Following prescribed dietary guidelines and maintaining an active lifestyle can enhance results and mitigate side effects.

Conclusion and Final Thoughts

In summary, both Wegovy and Mounjaro offer effective solutions for weight management, yet their side effect profiles differ significantly. Wegovy tends to have a higher incidence of gastrointestinal side effects, particularly nausea, while Mounjaro generally exhibits a lower rate of these reactions. However, both medications carry serious risks that require careful consideration.

Ultimately, the choice between Wegovy and Mounjaro should be made in consultation with a healthcare provider, who can assess individual needs and health profiles. Together, we can explore personalized weight loss solutions that prioritize safety and effectiveness.

FAQ

Can I switch between Wegovy and Mounjaro?
Yes, switching between the two medications is possible, but it should only be done under the guidance of a healthcare provider. A waiting period may be required before starting the new medication.

Are there any long-term side effects associated with these medications?
While both medications have been studied for extended periods, long-term effects are still being evaluated. Regular check-ins with your healthcare provider can help monitor any potential risks.

How do I know which medication is suitable for me?
Consultation with a healthcare provider is essential to determine the appropriate medication based on your individual health history, weight loss goals, and potential side effects.

Are there alternative weight loss options besides Wegovy and Mounjaro?
Yes, there are various alternatives, including lifestyle changes, dietary adjustments, and other medications. Discussing options with a healthcare provider can help you find the best fit for your needs.

By understanding the nuances of Wegovy and Mounjaro and their side effects, together we can navigate the path to effective and safe weight management. If you’re considering these options, we encourage you to take our free assessment quiz to see if you qualify for personalized weight loss programs tailored to your unique journey.

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