Mounjaro vs. Wegovy: Which Has More Side Effects?

Reading time
7 min
Published on
August 4, 2025
Updated on
August 11, 2025
Mounjaro vs. Wegovy: Which Has More Side Effects?

Introduction

When it comes to weight loss medications, the choices can be overwhelming. With various options available, including Mounjaro and Wegovy, individuals seeking effective solutions often wonder about the potential side effects of these treatments. Both Mounjaro (tirzepatide) and Wegovy (semaglutide) belong to a class of drugs known as GLP-1 receptor agonists, which play crucial roles in appetite regulation and blood sugar control. However, they differ significantly in their formulations, dosages, and side effect profiles.

At TrimRx, we understand the importance of making informed decisions about weight loss treatments. Our mission is to empower individuals with personalized, medically supervised weight loss solutions that are safe and effective. In this blog post, we’ll delve into the side effects associated with Mounjaro and Wegovy, allowing you to better understand your options and make the best choice for your health journey.

Did you know that nearly 40% of adults in the United States struggle with obesity? This alarming statistic highlights the growing need for effective weight management solutions. With the rise of medications like Mounjaro and Wegovy, many people are seeking answers to their weight loss challenges. Both of these medications have shown promise, but they come with their own set of potential side effects.

In this article, we aim to provide a comprehensive comparison of Mounjaro and Wegovy, specifically focusing on their side effects. We’ll explore their mechanisms of action, the frequency of reported side effects, and what you can expect during treatment. By the end of this post, you will have a clearer understanding of which medication might be better suited for you, based on your personal health needs and lifestyle.

Together, we’ll navigate through this complex topic, ensuring you leave with valuable insights that can guide your weight loss journey. Let’s dive deeper into the specifics of Mounjaro and Wegovy.

Understanding GLP-1 Receptor Agonists

Before we delve into the side effects of Mounjaro and Wegovy, it’s essential to understand what GLP-1 receptor agonists are and how they work. GLP-1, or glucagon-like peptide-1, is a hormone that plays a critical role in glucose metabolism and appetite regulation.

Mechanism of Action

Both Mounjaro and Wegovy mimic the effects of GLP-1 in the body, leading to several physiological responses:

  • Appetite Suppression: These medications signal to the brain that you are full, which can help reduce calorie intake.
  • Slowed Gastric Emptying: By delaying the emptying of the stomach, they prolong feelings of fullness after meals.
  • Improved Blood Sugar Control: Both drugs help regulate blood sugar levels by stimulating insulin secretion in response to meals.

Differences Between Mounjaro and Wegovy

While both medications function similarly, there are key differences in their compositions:

  • Active Ingredients:
    • Mounjaro: Contains tirzepatide, which is a dual agonist that targets both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide) receptors.
    • Wegovy: Contains semaglutide, which solely targets GLP-1 receptors.
  • Dosage and Administration:
    • Mounjaro: Typically starts at a lower dose of 2.5 mg and can be increased to a maximum of 15 mg.
    • Wegovy: Starts at 0.25 mg and can be increased to a maximum of 2.4 mg.

Understanding these differences is essential as we explore the side effects associated with each medication.

Side Effects of Mounjaro

Mounjaro has garnered attention for its effectiveness in promoting weight loss, but like any medication, it comes with potential side effects. According to clinical trials, the following adverse reactions were commonly reported:

Common Side Effects

  1. Nausea: Approximately 12% of users reported nausea, particularly during dose increases.
  2. Diarrhea: This was reported by around 6% of participants.
  3. Indigestion: Occurred in about 8% of users.
  4. Constipation: Reported by 6% of participants.
  5. Stomach Pain: Experienced by 6% of users.

Serious Side Effects

While Mounjaro is generally well-tolerated, some serious side effects may occur, including:

  • Pancreatitis: Inflammation of the pancreas, which can be severe.
  • Thyroid Tumors: Both Mounjaro and Wegovy carry a boxed warning for potential thyroid cancer risk.
  • Allergic Reactions: Severe reactions, although rare, can occur and require immediate medical attention.

It’s important to note that the frequency and severity of side effects can vary significantly among individuals. Monitoring your body’s response after starting Mounjaro is crucial.

Side Effects of Wegovy

Wegovy has also proven effective for weight management, but it is essential to consider its side effect profile as well. Clinical trials revealed the following common side effects:

Common Side Effects

  1. Nausea: A common side effect with about 44% of users reporting this reaction.
  2. Diarrhea: Approximately 30% of participants experienced diarrhea.
  3. Constipation: About 24% reported constipation.
  4. Vomiting: This side effect affected around 24% of users.

Serious Side Effects

Similar to Mounjaro, Wegovy also has serious potential side effects, including:

  • Pancreatitis: The risk of pancreatitis is present; patients should be aware of symptoms such as severe abdominal pain.
  • Thyroid Tumors: The boxed warning for thyroid cancer applies to Wegovy as well.
  • Kidney Issues: Some users may experience acute kidney injury.

As with Mounjaro, individual reactions can vary greatly, making it vital to consult with a healthcare provider if any side effects arise.

Comparing Side Effects: Mounjaro vs. Wegovy

Now that we have examined the side effects of both medications, let’s compare them directly:

Side Effect Mounjaro (%) Wegovy (%)
Nausea 12% 44%
Diarrhea 6% 30%
Indigestion 8% N/A
Constipation 6% 24%
Vomiting N/A 24%

Interpretation of the Data

From the comparison, it is evident that Wegovy has a higher incidence of nausea, diarrhea, and vomiting compared to Mounjaro. This difference may be attributed to the specific mechanisms of action of each drug and how they affect the gastrointestinal system. For individuals concerned about tolerability, this information is crucial in making a decision.

Considerations for Choosing Between Mounjaro and Wegovy

Choosing the right medication for weight loss involves considering various factors, including:

  • Personal Health History: Discuss your medical history with a healthcare provider to identify any contraindications.
  • Potential Side Effects: Evaluate which medication aligns better with your tolerance for side effects.
  • Weight Loss Goals: Both medications have been shown to promote significant weight loss, but individual responses may vary.

At TrimRx, we emphasize the importance of personalized care. We encourage you to take our free assessment quiz to see if you qualify for our prescription weight loss medications, including Mounjaro and Wegovy. Understanding your unique health profile can help us tailor a program that meets your needs.

Additional Support During Your Weight Loss Journey

In addition to medications, we offer quick-access supplements that may enhance your weight loss journey. Our GLP-1 Daily Support and Weight Loss Boost supplements are designed to complement your primary treatment, helping you achieve your goals more effectively.

Conclusion

Navigating the world of weight loss medications can be complex, especially when considering options like Mounjaro and Wegovy. Both medications have proven effective in clinical trials, but they come with different side effects and mechanisms of action. Mounjaro tends to have a lower incidence of gastrointestinal side effects compared to Wegovy, which makes it a suitable choice for some individuals.

Ultimately, the decision should be based on careful consideration of your personal health needs, lifestyle, and goals. At TrimRx, we’re here to support you every step of the way, ensuring you have access to personalized, medically supervised weight loss solutions.

If you’re ready to take the next step in your weight loss journey, we invite you to take our free assessment quiz to explore your options. Together, we can achieve your health and wellness goals.

FAQ

1. What is the primary difference between Mounjaro and Wegovy?
Mounjaro contains tirzepatide, which targets both GLP-1 and GIP receptors, while Wegovy contains semaglutide, which only targets GLP-1 receptors.

2. Are the side effects of Mounjaro and Wegovy the same?
While both medications share some common side effects, Wegovy has a higher incidence of nausea and gastrointestinal issues compared to Mounjaro.

3. How do I know which medication is right for me?
Choosing the right medication should involve a discussion with your healthcare provider, taking into account your health history, tolerance for side effects, and weight loss goals.

4. Can I switch from one medication to another?
Yes, switching between Mounjaro and Wegovy may be possible, but it requires a consultation with your healthcare provider to ensure it is safe and appropriate for your situation.

5. What additional support does TrimRx offer?
TrimRx offers personalized weight loss programs, including prescription medications and quick-access supplements designed to enhance your weight loss journey.

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