27/02/2026
Mounjaro Pens - Advice for patients
A falsified version of Mounjaro (tirzepatide) KwikPen 15mg solution for injection in pre-filled pen has been identified supplied by one UK online pharmacy - The Private Pharmacy Clinic, located in Birmingham. This pharmacy is unable to provide more of this medication at this time.
Check the batch number on any Mounjaro KwikPen 15mg pre-filled pens you have been dispensed. If you have a 15mg pen with batch number D873576, do not use the pen.
Patients who have this pen should report the case to the MHRA via info@mhra.gov.uk, please include “Mounjaro Pens” in the subject line.Patients should keep the pen in a safe place, the MHRA will arrange a collection.
If you are unsure of how to identify the pen or are unsure on whether you have administered an affected batch and have any questions please speak to a healthcare professional.
If you have administered injections using the pen already, please be reassured that, on the basis of the cases reviewed to date, the risk to you is low. If you have administered injections, and you are experiencing any unusual symptoms that you are concerned about, seek immediate medical attention.
If you suspect that you’ve had a side effect to these affected pens, or suspect it’s not a genuine product, or have a defective pen you can report it to our Yellow Card scheme. It is important patients do not try to extract any dosage if a pen is defective in any way.
For further information and guidance on safe use of GLP-1’s please go to GLP-1 medicines for weight loss and diabetes: what you need to know - GOV.UK.