Falsified version of Mounjaro (tirzepatide) KwikPen 15mg Warning

A falsified version of Mounjaro (tirzepatide) KwikPen 15mg solution for injection in pre-filled pen has been identified as supplied by one UK online pharmacy namely, The Private Pharmacy Clinic, located in Birmingham.

If you have received a 15mg KwikPen from the above online pharmacy you should follow these instructions:

  • 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 viainfo@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
  • patients should be reminded on the guidance on safe use of GLP-1’s GLP-1 medicines for weight loss and diabetes: what you need to know – GOV.UK

Date published: 4th March, 2026
Date last updated: 4th March, 2026