Birmingham Woman Duped by Counterfeit Mounjaro Pens

Incident highlights growing problem of fake weight loss medications in the UK

Mar. 19, 2026 at 4:23am

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A 46-year-old Birmingham woman's experience with counterfeit Mounjaro pens has brought to light the rise of fake weight loss medications being sold online in the UK. The woman purchased over £1,000 worth of the medication from an unverified online pharmacy, only to be alerted by the Medicines and Healthcare products Regulatory Agency (MHRA) that the batch was counterfeit. This incident underscores the risks of obtaining prescription drugs from untrustworthy sources and the importance of verifying the authenticity of medications.

Why it matters

The sale of counterfeit weight loss medications like Mounjaro is a growing problem in the UK, as patients increasingly turn to online pharmacies to access these drugs. This case highlights the potential dangers of using substandard or tampered products, which may contain incorrect dosages or unknown ingredients, putting patients' health at risk. It also raises concerns about the need for stronger regulation and consumer education around purchasing prescription medications online.

The details

The MHRA identified a batch of 15mg Mounjaro KwikPen injectors (batch number D873576) dispensed by The Private Pharmacy Clinic as counterfeit. While the pens contained the active ingredient, tirzepatide, the manufacturing conditions were unknown, raising concerns about sterility and accurate dosage. The woman had purchased over £1,000 worth of the medication from the clinic over six months.

  • On March 2nd, 2026, the MHRA alerted the woman to the potential issue with the counterfeit Mounjaro pens.
  • The woman had been purchasing the medication from The Private Pharmacy Clinic over the past six months.

The players

The Private Pharmacy Clinic

An online pharmacy that sold the counterfeit Mounjaro pens to the Birmingham woman.

Medicines and Healthcare products Regulatory Agency (MHRA)

The UK's regulatory body for medicines and medical devices, which identified the batch of counterfeit Mounjaro pens and alerted the public.

Mounjaro

A prescription weight loss medication containing the active ingredient tirzepatide, which regulates blood sugar and appetite.

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What they’re saying

“We must remain vigilant against the sale of counterfeit medications, which pose serious risks to public health. Patients should only obtain prescription drugs from licensed, reputable sources.”

— MHRA spokesperson

What’s next

The MHRA is continuing to investigate the source of the counterfeit Mounjaro pens and is working to remove any remaining products from circulation. The agency is also urging the public to be cautious when purchasing medications online and to report any suspicious activity.

The takeaway

This case highlights the growing problem of counterfeit weight loss medications in the UK and the importance of obtaining prescription drugs from verified, licensed sources. Patients should be wary of online pharmacies offering significantly discounted prices, as this could be a sign of fraudulent products. Maintaining a healthy lifestyle through diet and exercise remains the safest and most sustainable approach to weight management.