Mounjaro vs Wegovy: Which is better for weight loss?

BMI Calculator



For personalized guidance, please book a consultation or call us at 718-699-9737.


The landscape of weight loss medications has seen significant advancements with drugs like semaglutide (Wegovy) and tirzepatide (Mounjaro) emerging as potential game-changers. This article provides a comprehensive comparison of these medications, focusing on their efficacy in promoting weight loss.

Feature Mounjaro (Tirzepatide) Wegovy (Semaglutide)
Efficacy in Weight Loss Up to 21% body weight loss Up to 15% body weight loss
Side Effects Nausea, diarrhea, vomiting, etc. Nausea, diarrhea, headache, fatigue, etc.
Cost (without insurance) $1,023.04 for four-week supply $1,349.02 for four-week supply
Approval Status Approved for type 2 diabetes Approved for weight loss

Mounjaro vs. Wegovy for Weight Loss


Both Mounjaro and Wegovy have shown potential in aiding weight loss. However, studies indicate that Mounjaro is more effective in supporting weight loss and lowering blood sugar levels. For instance, participants taking the highest 15 mg dose of Mounjaro lost 20% of their body weight within approximately 18 months, while those on Wegovy lost nearly 15% in the same timeframe.

Direct comparisons between the two medications have confirmed that the highest dose of Mounjaro produces more weight loss than Wegovy. Additionally, Mounjaro has demonstrated a more significant reduction in blood sugar levels, making it a potential consideration for individuals with type 2 diabetes.

The efficacy of Mounjaro in weight loss is dose-dependent. For example, individuals taking the highest 15 mg dose of Mounjaro lose nearly 21% of their body weight. In contrast, those on 10 mg and 5 mg weekly doses lose 19.5% and 15% of their body weight, respectively.

Currently, Mounjaro is available in various dosage strengths ranging from 2.5 mg to 15 mg. The starting dosage is 2.5 mg, taken weekly. As for Wegovy, the maintenance dosage is 2.4 mg weekly.

While Wegovy received FDA approval for weight loss in 2017, Mounjaro is currently approved only for treating type 2 diabetes. However, in 2022, Eli Lilly announced that the FDA granted Fast Track designation for tirzepatide, the active ingredient in Mounjaro, to be investigated as a treatment for obesity. If successful, Mounjaro could receive approval for weight loss by late 2023.

Side Effects of Tirzepatide (Mounjaro) vs. Semaglutide (Wegovy)

side effects


Both Mounjaro and Wegovy, with active ingredients tirzepatide and semaglutide respectively, exhibit similar side effects. Common side effects include nausea, diarrhea, vomiting, constipation, abdominal pain, and indigestion. Other side effects may include belching, flatulence, bloating, and gastroesophageal reflux disease. Specific to Wegovy, users might experience headache, fatigue, dizziness, gastroenteritis, and symptoms like a runny nose or sore throat.

Nausea and diarrhea are the most prevalent side effects for both medications. However, these side effects are typically manageable and tend to subside as the body adjusts to the medication.

In rare instances, severe side effects can manifest. For example, diabetic retinopathy may be more prevalent in type 2 diabetes patients taking either medication. Additionally, acute pancreatitis, kidney or gallbladder issues may arise, making it inadvisable for individuals with a history of these conditions to use Mounjaro or Wegovy. Unique severe side effects include gastrointestinal disease for Mounjaro and increased heart rate and suicidal tendencies for Wegovy.

Cost and Availability


Wegovy is priced higher than Mounjaro, with a four-week supply costing $1,349.02 without insurance, compared to Mounjaro's $1,023.04. Neither drug currently has a generic version. The actual cost can vary based on insurance plans and pharmacies. Both drug manufacturers offer savings programs, potentially making them more accessible to those with commercial or private insurance.

Cost is a significant factor when considering a treatment plan. It's advisable to check with insurance providers about coverage and co-pays and to explore savings offers and pharmacy options for the best prices.

Combining Mounjaro and Wegovy

It's essential to note that GLP-1 medications like Wegovy and Mounjaro should not be used concurrently. They also shouldn't be combined with other GLP-1 medications or drugs containing the same active ingredients. It's currently unknown if these medications can be safely or effectively used alongside other weight loss medications.

Always inform healthcare providers about any medications or supplements being taken to prevent potential drug interactions. This is especially crucial for drugs like Mounjaro and Wegovy, which can impact the body's absorption of oral medications.

Who Should Avoid Mounjaro or Wegovy?

Both Mounjaro and Wegovy have specific contraindications. They shouldn't be taken by individuals with a history or current diagnosis of pancreatitis, acute kidney injury, acute gallbladder disease, medullary thyroid carcinoma, multiple endocrine neoplasia syndrome type 2, or allergies to any of the medication's ingredients.

Additionally, those with severe gastrointestinal disease should avoid Mounjaro. Pregnant individuals or those planning pregnancy should avoid both medications, as there is no adequate data to confirm their safety during pregnancy.

Switching Between Mounjaro and Wegovy

It's recommended that if switching between these two medications, one should work closely with a healthcare professional. This is because there is a need to monitor blood glucose levels and any potential side effects. Additionally, patients should be aware of the dosing differences between the two drugs and avoid overlapping doses.

Understanding the Mechanisms of Mounjaro and Wegovy

Weight management has always been a significant concern for many, especially for overweight or obese adults. The introduction of medications like Mounjaro and Wegovy has revolutionized chronic weight management strategies. But how do these medications promote significant weight loss?

Both Mounjaro and Wegovy belong to a class of drugs known as GLP-1 (glucagon-like peptide-1) receptor agonists. These drugs work by mimicking the action of the GLP-1 hormone, which is naturally produced in the intestines. This hormone plays a pivotal role in regulating blood sugar levels by stimulating the pancreas to release more insulin after a meal. Furthermore, GLP-1 slows down gastric emptying, leading to a decreased appetite and feelings of fullness after eating. This dual action not only aids in blood glucose control but also promotes weight loss by reducing food intake.

Mounjaro, in particular, has an added mechanism. It targets another hormone called GIP (glucose-dependent insulinotropic polypeptide). This dual incretin action, targeting both GLP-1 and GIP, enhances its efficacy in blood glucose control and weight reduction. Clinical trials have shown that patients on Mounjaro experienced more significant weight loss outcomes compared to those on other medications of the same class.

It's essential to understand that while these medications can aid in weight loss, they are not a substitute for lifestyle interventions. A balanced diet and increased physical activity remain crucial for achieving and maintaining weight loss. Moreover, these drugs are not free from side effects. Common adverse events include nausea, stomach pain, and low blood sugar. It's always advisable to discuss potential risks and benefits with a healthcare provider before starting any medication.

Furthermore, while both drugs have shown efficacy in weight loss, they have different FDA approvals. Wegovy is FDA approved for weight management in overweight adults with at least one weight-related health condition, such as high blood pressure or high cholesterol. On the other hand, Mounjaro is primarily approved for the treatment of type 2 diabetes. However, its potential in weight management is currently under investigation, with promising results from recent studies.

In conclusion, while the landscape of weight loss medications is evolving, it's crucial to approach weight management holistically. Medications like Mounjaro and Wegovy can be beneficial tools in the journey, but they should be used in conjunction with lifestyle changes for the best results.



FAQs: Mounjaro vs. Wegovy for Weight Loss

Which medication has shown more efficacy in weight loss?

Mounjaro has demonstrated up to 21% body weight loss, while Wegovy has shown up to 15% body weight loss in the respective studies.

Are there any common side effects for both drugs?

Yes, both medications commonly cause nausea, diarrhea, and vomiting among other side effects. However, specific side effects might differ.

How do the costs of Mounjaro and Wegovy compare?

Without insurance, a four-week supply of Mounjaro costs $1,023.04, while Wegovy costs $1,349.02 for a similar duration.

Can I combine Mounjaro and Wegovy for better results?

No, GLP-1 medications like Wegovy and Mounjaro should not be used concurrently or combined with other GLP-1 drugs.

Who should avoid taking these medications?

Individuals with conditions like pancreatitis, acute kidney injury, acute gallbladder disease, and certain types of cancers should avoid both drugs. Always consult with a healthcare professional.

Is it safe to switch between Mounjaro and Wegovy?

If considering a switch, one should consult with a healthcare professional to monitor potential side effects and manage dosages appropriately.