Falsified Mounjaro KwikPen 15mg pre-filled pens found

Drug Safety Update: The MHRA has issued a Drug Safety Update for Mounjaro KwikPen 15mg pre-filled pens.

Published: 24 February 2026

The Medicines and Healthcare products Regulatory Agency (MHRA) has issued a Drug Safety Update for Mounjaro KwikPen 15mg pre-filled pens.

A falsified version of Mounjaro (tirzepatide) KwikPen 15mg solution for injection has been found supplied through one online pharmacy in the UK. The falsified product is labelled with batch D873576 and applies to Mounjaro KwikPen 15mg solution for injection in pre-filled pen only.

The issue was identified due to faults with the pens, where in all but one case the dose knob came off while in use. The MHRA has provided advice for healthcare professionals and patients as a precautionary measure who may be in possession of a 15mg pen with this batch number.

Further information and the advice can be found in the Drug Safety Update.

No documents available for download.

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