Shortage of Mounjaro: UK Supply Issues for 12.5mg & 15mg Pens
The UK is currently facing a shortage of Mounjaro (tirzepatide), affecting the 12.5mg and 15mg pens. Eli Lilly, the manufacturer, has confirmed supply chain disruptions, leaving many patients struggling to access their prescribed doses.

Why Is There a Shortage of Mounjaro?
The shortage stems from unprecedented global demand combined with manufacturing delays. As a highly effective treatment for type 2 diabetes and weight management, prescriptions have surged, outpacing production capacity.
Eli Lilly has prioritised existing patients, but new prescriptions may face delays. While lower doses (2.5mg–10mg) remain available, the 12.5mg and 15mg pens are in critically short supply.
When Will the This Shortage End?
Eli Lilly expects the problem to ease gradually, with full supply restoration anticipated by mid-to-late April 2025. However, exact timelines remain uncertain due to fluctuating demand and production challenges.
What Patients Can Do For Themselves?
- Order Prescriptions Early – With limited stock, patients should request refills well in advance.
- Consult Your Doctor – If your usual dose is unavailable, your healthcare provider may adjust your treatment plan.
- Check Pharmacy Availability – Some pharmacies may have remaining stock, so call ahead before submitting your prescription.
Official Updates on the Mounjaro Shortage
Eli Lilly is working closely with UK health authorities to resolve the shortage of Mounjaro as quickly as possible. Patients can stay informed through:
Eli Lilly UK Updates
Mounjaro Supply Alerts
Key Points About the 12.5mg & 15mg Pens
- The shortage of Mounjaro mainly affects 12.5mg and 15mg pens, with lower doses more readily available.
- Supplies are expected to improve in April 2025, but patients should plan ahead.
- Avoid stockpiling to ensure fair access for those who depend on Mounjaro for diabetes management.
If you’re impacted and unable to obtain your medication, speak to your doctor or pharmacist for guidance. Stay updated through official sources for the latest supply news.