Falsified Mounjaro KwikPen 15mg pre-filled pens

Advice

• 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
• 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"

Published: Feb 26, 2026