1. What are Mounjaro and Wegovy?
- Mounjaro (tirzepatide): Injectable medication, dual GIP + GLP-1 receptor agonist. Approved for type 2 diabetes but also used for weight loss.
- Wegovy (semaglutide 2.4 mg): Injectable GLP-1 receptor agonist, approved for chronic weight management in adults with obesity or overweight with related health conditions.
2. How do they work?
- Both reduce appetite, increase feelings of fullness, and slow gastric emptying.
- Mounjaro also affects GIP hormones, potentially improving insulin sensitivity and slightly boosting weight loss compared to GLP-1 alone.
3. How are they administered?
- Subcutaneous (under the skin) injection once weekly.
- Dose is gradually increased over weeks to minimize side effects.
4. How much weight can I expect to lose?
- Mounjaro: 20–25% of body weight in clinical trials at higher doses.
- Wegovy: 15–20% of body weight over ~68 weeks.
- Results vary by individual and require lifestyle changes for best outcomes.
5. How long until I see results?
- Appetite suppression and initial weight loss often begin within a few weeks.
- Significant weight loss usually occurs over several months with consistent weekly dosing.
6. What are the common side effects?
- Nausea, vomiting, diarrhea, constipation
- Abdominal pain or bloating
- Decreased appetite (which is intended)
- Rare: pancreatitis, gallbladder issues
Here’s a Mounjaro vs. Wegovy Weight Loss Quick Reference Sheet for easy comparison:
Mounjaro vs. Wegovy – Weight Loss Quick Reference
| Feature | Mounjaro (Tirzepatide) | Wegovy (Semaglutide 2.4 mg) |
|---|---|---|
| Type | Dual GIP + GLP-1 receptor agonist | GLP-1 receptor agonist |
| Primary Use | Type 2 diabetes & weight loss | Chronic weight management |
| Administration | Subcutaneous injection, once weekly | Subcutaneous injection, once weekly |
| Dosing | Gradually increased to target dose | Gradually increased over 16–20 weeks |
| Weight Loss Potential | 20–25% body weight | 15–20% body weight |
| Mechanism | Appetite suppression, slower gastric emptying, improved insulin sensitivity | Appetite suppression, slower gastric emptying |
| Common Side Effects | Nausea, vomiting, diarrhea, constipation, abdominal discomfort | Nausea, vomiting, diarrhea, constipation, abdominal discomfort |
| Rare Risks | Pancreatitis, gallbladder issues | Pancreatitis, gallbladder issues |
| Precautions | Avoid if personal/family history of medullary thyroid cancer, type 1 diabetes | Avoid if personal/family history of medullary thyroid cancer |
| Lifestyle Required | Yes – diet & exercise enhance results | Yes – diet & exercise enhance results |
| Maintenance | Long-term use may be required to sustain weight loss | Long-term use may be required to sustain weight loss |
✅ Key Takeaways:
- Mounjaro may produce slightly greater weight loss and impacts blood sugar.
- Wegovy is specifically designed for weight management.
- Both require weekly injections, gradual dose escalation, and lifestyle changes.
- Stopping either medication may lead to weight regain if lifestyle changes are not maintained.
7. Who should not take these medications?
- Personal or family history of medullary thyroid cancer
- History of multiple endocrine neoplasia syndrome type 2 (MEN 2)
- Type 1 diabetes (for Mounjaro, specifically)
- Pregnant or breastfeeding individuals (safety not established)
8. Can I take Mounjaro or Wegovy together?
- No. Using both together is not recommended; your doctor will prescribe the one most suitable for your needs.
9. Do I still need to diet and exercise?
- Yes. Both medications are most effective when combined with a reduced-calorie diet and regular physical activity.
10. How long do I need to take it?
- Long-term treatment is often required to maintain weight loss.
- Stopping the medication may lead to gradual weight regain, so a maintenance plan should be discussed with your healthcare provider.
11. Monitoring and follow-up
- Regular check-ins with your doctor are important to monitor:
- Weight loss progress
- Blood sugar (especially with Mounjaro)
- Side effects or GI symptoms
✅ Key Takeaways:
Mounjaro may produce slightly greater weight loss and impacts blood sugar.
Wegovy is specifically designed for weight management.
Both require weekly injections, gradual dose escalation, and lifestyle changes.
Stopping either medication may lead to weight regain if lifestyle changes are not maintained
- Read more about weight loss injections and book in for a consultation
