Updated on Oct 11, 2024 • 5 min read

Key Takeaways

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

When it comes to weight loss and diabetes management, Saxenda and Mounjaro are two popular injectable medications that often come up in discussions. Though they share some similarities, they also have key differences that can influence which one might be better for you. This article will explore five important distinctions between Saxenda and Mounjaro to help you make an informed decision.

Key Takeaways

  • Saxenda is FDA-approved for weight loss, while Mounjaro is approved for managing type 2 diabetes but can be used off-label for weight loss.
  • Mounjaro tends to be more effective for weight loss, with users losing up to 21% of their body weight, compared to 9% for Saxenda users.
  • Saxenda requires a daily injection, whereas Mounjaro is administered once a week.
  • Both medications can cause nausea, but Saxenda may also cause headaches, fatigue, and dizziness.
  • Your doctor will help decide which medication is best for you based on your health goals, medical history, and lifestyle.

1. Mechanism of Action

Both Mounjaro and Saxenda belong to a class of drugs called GLP-1 receptor agonists. These medications mimic the actions of GLP-1, an incretin hormone that stimulates insulin secretion in the pancreas, slows gastric emptying, and reduces appetite. By activating GLP-1 receptors, these drugs help control blood sugar levels and promote weight loss.

Mounjaro, developed by Eli Lilly, contains the active ingredient tirzepatide. It is unique because it mimics two hormones: GLP-1 and GIP (glucose-dependent insulinotropic polypeptide). This dual action makes Mounjaro the first and only approved once-weekly GIP and GLP-1 receptor agonist. By targeting both GIP and GLP-1 receptors, Mounjaro offers a more comprehensive approach to managing blood sugar and weight.

On the other hand, Saxenda, manufactured by Novo Nordisk, contains liraglutide, a GLP-1 receptor agonist. While it also activates GLP-1 receptors to regulate insulin and blood sugar levels, it does not have the dual action of Mounjaro. Saxenda works primarily by prolonging the effects of GLP-1, helping to control blood sugar levels and reduce appetite.

2. FDA Approval

The FDA approval process is crucial for ensuring the safety and effectiveness of medications. Saxenda and Mounjaro have both undergone this rigorous process, but their approvals differ in terms of timing and specific indications.

Saxenda, which contains liraglutide, was approved by the FDA in 2014 for weight management in adults with obesity or overweight and at least one weight-related condition. It is also approved for use in children aged 12 and older.

Mounjaro, on the other hand, contains tirzepatide and was approved by the FDA in 2022. Initially, it was approved for the treatment of type 2 diabetes, but it has shown promise in weight management as well.

Here is a summary of their FDA approvals:

The FDA approval process involves several stages, including preclinical testing, clinical trials, and data review. This ensures that medications like Saxenda and Mounjaro are both safe and effective for their intended uses.

3. Weight Loss Effectiveness

When comparing Saxenda and Mounjaro, weight loss effectiveness is a crucial factor. Both medications have shown promising results, but there are notable differences.

Saxenda

Saxenda, an injectable medication, has been proven to help people lose between 5% and 10% of their body weight. Clinical trials indicate that 56% of patients achieved significant weight loss within the first year, and about half maintained this loss over three years.

Mounjaro

Mounjaro, on the other hand, has demonstrated even more impressive results. Clinical studies show that patients using Mounjaro experienced an average weight loss of 22.5%. This is significantly higher than the weight loss achieved with Saxenda.

Comparison Table

In summary, while both medications are effective, Mounjaro has shown a higher average weight loss compared to Saxenda.

4. Dosage and Administration

Saxenda

Saxenda is administered as a daily injection under the skin. The starting dose is 0.6 mg, which is gradually increased to a maximum of 3.0 mg per day. This gradual increase helps to minimize gastrointestinal side effects. It's important to take Saxenda at the same time each day to maintain consistency.

Mounjaro

Mounjaro, on the other hand, is administered once a week. The initial dose is typically 2.5 mg, which is increased to 5 mg after four weeks. Depending on the patient's response and weight loss goals, the dose can be further increased in 2.5 mg increments every four weeks, up to a maximum of 15 mg per week. This weekly dosing schedule offers convenience for those who prefer fewer injections.

Storage Instructions

Both medications should be stored in a refrigerator at 36°F to 46°F. They can be kept at room temperature (up to 86°F) for a maximum of 21 days. Avoid freezing, as it can damage the medication. Always store them in their original packaging to protect them from light.

5. Side Effects

When comparing Saxenda and Mounjaro, it's important to consider their side effects. Both medications have common and serious side effects that users should be aware of.

Common Side Effects

Saxenda:

  • Nausea
  • Diarrhea
  • Constipation
  • Vomiting
  • Headache
  • Upset stomach
  • Injection site reaction
  • Tiredness
  • Low blood sugar
  • Dizziness
  • Stomach pain
  • Gallstones
  • Difficulty sleeping (insomnia)

Mounjaro:

  • Nausea
  • Diarrhea
  • Decreased appetite
  • Vomiting
  • Constipation
  • Indigestion
  • Stomach pain

Serious Side Effects

Both medications can cause serious side effects, though they are rare. If you experience any of these, seek medical attention immediately.

Saxenda:

  • Severe allergic reaction (anaphylaxis)
  • Inflammation of the pancreas (pancreatitis)
  • Severe and persistent pain in the stomach area (abdomen)
  • Thyroid cancer and tumors

Mounjaro:

  • Inflammation of the pancreas (acute pancreatitis)
  • Depression
  • Kidney failure and kidney problems
  • Thyroid cancer and tumors
  • Severe allergic reactions

Comparison of Side Effects

Note: The most common side effects for both Saxenda and Mounjaro are gastrointestinal (digestive tract) side effects. These include nausea, diarrhea, and stomach pain. If you experience persistent mild side effects, talk to your doctor or pharmacist. Research suggests around 27% of people on Saxenda stop taking the medication due to adverse effects compared to 8-12% on Mounjaro. Always consult your healthcare provider for advice tailored to your health situation.

Conclusion

In summary, both Saxenda and Mounjaro offer unique benefits for weight management and diabetes control. Saxenda is specifically approved for weight loss, making it a go-to option for those primarily focused on shedding pounds. On the other hand, Mounjaro, while primarily approved for type 2 diabetes, has shown impressive weight loss results and can be prescribed off-label for this purpose. The choice between the two should be made in consultation with a healthcare provider, considering individual health goals, medical history, and lifestyle. Understanding these key differences can help you and your doctor make the best decision for your health journey.

Frequently Asked Questions

What is Saxenda?

Saxenda is a prescription medicine used to help people lose weight. It's injected once a day and works by mimicking a hormone that helps control appetite.

What is Mounjaro?

Mounjaro is a medication prescribed for people with type 2 diabetes to help manage blood sugar levels. It is injected once a week.

How do Saxenda and Mounjaro work?

Saxenda and Mounjaro both mimic hormones that help control appetite and blood sugar levels. Saxenda mainly works on the GLP-1 hormone, while Mounjaro works on both GLP-1 and GIP hormones.

Are Saxenda and Mounjaro FDA-approved?

Saxenda is FDA-approved for weight loss. Mounjaro is FDA-approved for managing type 2 diabetes, but it can be prescribed off-label for weight loss.

Which medication is more effective for weight loss?

Studies show that Mounjaro is more effective for weight loss, with users losing up to 21% of their body weight. Saxenda users typically lose around 9% of their body weight.

What are the common side effects of Saxenda and Mounjaro?

Both medications can cause nausea. Saxenda may also cause headaches, fatigue, and dizziness, while Mounjaro might cause issues like low blood sugar.

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