How to Switch from Mounjaro to Foundayo (Orforglipron)
Switching from Mounjaro (tirzepatide for diabetes) to Foundayo — what changes, dose mapping, and managing both weight and blood sugar.
Mounjaro vs Zepbound: Same Drug, Different Indication
Mounjaro and Zepbound are both tirzepatide — the same molecule. Mounjaro is FDA-approved for type 2 diabetes; Zepbound is approved for weight management. The switching process to Foundayo is identical, but the clinical considerations differ:
- If using Mounjaro for diabetes: Foundayo is not FDA-approved for diabetes. Switching may require adding another diabetes medication.
- If using Mounjaro for weight loss: The switch to Foundayo is the same as Zepbound → Foundayo.
- If using Mounjaro for both: Work closely with your endocrinologist to ensure blood sugar remains controlled.
Blood Sugar Management During the Switch
This is the critical consideration for Mounjaro patients. Tirzepatide (Mounjaro) has significant A1C-lowering effects. Foundayo also lowers blood sugar but is not approved for diabetes treatment.
What to monitor:
- Check blood sugar more frequently during the first 4-6 weeks of transition
- If you take other diabetes medications (metformin, insulin), your doctor may need to adjust doses
- Watch for signs of hyperglycemia as Mounjaro's effects wear off and before Foundayo reaches therapeutic levels
Dose Equivalence: Mounjaro to Foundayo
Same as the Zepbound-to-Foundayo mapping (since Mounjaro = tirzepatide = same drug):
| Mounjaro Dose | Foundayo Target |
|---|---|
| 2.5mg | 0.8mg start → titrate up |
| 5mg | Target 5.5-9mg |
| 7.5mg | Target 9-14.5mg |
| 10-15mg | Target 14.5-17.2mg |
Step-by-Step: How to Make the Switch
Cost Comparison
| Medication | Self-Pay/mo | With Savings Card |
|---|---|---|
| Mounjaro 10mg | $1,023/mo | $25/mo |
| Foundayo (maintenance) | $149-349/mo | $25/mo |
| Savings | $724-874/mo saved | $0 difference |
Calculate Your Personalized Switch Plan
Enter your current medication and dose to get a detailed switching plan with dose mapping, timeline, and cost analysis.
Frequently Asked Questions
Sources & Citations
- Mounjaro (tirzepatide) FDA Prescribing Information
- Foundayo (orforglipron) FDA Prescribing Information
- SURPASS Clinical Trial Program (tirzepatide diabetes data)
- ATTAIN Clinical Trial Program (orforglipron data)
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