A sharp rise in the cost of one of the UK’s most popular weight loss injections has caused concern for patients and GPs alike. In August 2025, Mounjaro manufacturer Eli Lilly announced a 170% price increase for higher doses, sparking fears that desperate patients could turn to risky black-market alternatives.
Now, a last-minute deal means the price hike may not be as steep as first feared. From 1 September, UK suppliers will get the highest dose at £247.50 instead of £330. Pharmacies and private weight-loss providers will add their own mark-ups, but the increase to patients is expected to be capped at under 50% for most doses.
While this discount will soften the blow, experts still warn of disruption. Patients paying privately are already making difficult choices — from cutting other essentials to considering unsafe online options.
The risks of weight loss injections
Weight loss jabs like Mounjaro, Wegovy and Ozempic have helped many people lose weight and improve their health. But they are not risk-free. Reported side effects include stomach paralysis, gallbladder problems, and severe vomiting.
The bigger danger comes when people look for cheaper supplies outside of regulated healthcare. Counterfeit or unregulated injections can contain insulin or other harmful substances, putting users at risk of overdose, infection, or worse. Buying from social media sellers or unverified websites also means skipping proper medical screening and advice.
Why the price change matters
Eli Lilly has said the rise was about “aligning with global contributions to the cost of innovation.” In practice, that means UK patients will pay closer to US and European prices.
But with an estimated 1.5 million people in the UK now on weight-loss drugs — most of them buying privately — even a smaller increase is going to hit hard. Pharmacies say they will “do all they can” to support patients, but many will still face higher bills.
In desperation, some may:
- Buy drugs from unverified websites or overseas sellers
- Accept untested products from social media or WhatsApp groups
- Use incorrect doses or unsafe injection methods
- Miss proper screening for pre-existing conditions.
Stay safe and stay informed
Weight loss injections have helped some people feel healthier and more in control. But they’ve also caused serious harm. That’s the part of the story that rarely makes headlines.
Because the conversation about Ozempic, Wegovy and Mounjaro shouldn’t just be about before-and-after photos or celebrity endorsements. It should also be about real people — people like you — who deserve clear information, proper medical oversight, and support if things go wrong.
If your experience hasn’t lived up to the promise, or if you’ve suffered unexpected side effects, you’re not alone. And if enough people speak up, you can push for answers, accountability, and change.
Register your interest to stay informed about potential legal action, and you’ll be first to know if a claim opens in the UK.
Join the Claim connects consumers with SRA-regulated lawyers. Keep an eye out for updates on any potential claim and possible eligibility checks/registration opportunities.
