Mounjaro UK price hike: Latest update ahead of September 1
Peter Paumgardhen | Last update: 27th August 2025
We are now just days away from Eli Lilly’s September price increase on Mounjaro being implemented across the UK. SlimrChat has compiled the latest announced prices from online pharmacies and maintains a full, regularly updated list here.
Our latest inventory of announced Mounjaro price hikes and % increases
Below is SlimrChat’s latest inventory of the announced September Mounjaro prices from UK online pharmacies, alongside their percentage increases compared to pre-September levels. We will continuously update this section as more pharmacies publish their September prices.
For the full background on how the price increase was set in motion, see our original analysis: What will the new price of Mounjaro be after September’s hike?
Updated announced prices vs. our original estimates
On August 18 and 24, SlimrChat published estimated ranges for each Mounjaro dose after Eli Lilly announced its price increase. These estimates were based on UK list prices, rebates, expected pharmacy margins, and competitive pressures.
As of 26 August 2025, approximately one-third of UK online pharmacies have announced prices that land comfortably within these predicted ranges.
While the averages confirm the accuracy of our forecast, the wide spread between the lowest and highest prices also highlights the importance of patients comparing providers before making a commitment.
Chart: Predicted ranges vs. announced averages
To help visualise the situation, SlimrChat has charted the predicted low–to–high price range for each dose alongside the average announced prices available as of August 26, 2025.
Key observations from the chart:
Announced averages are clustering in the lower half of our predicted ranges.
The spread between low and high estimates is significant, showing why patients should shop around.
Many larger pharmacies have not yet published their prices, so averages may shift further.
Why this matters for patients
The Daily Mail later picked up SlimrChat’s early analysis, reflecting the significant national attention the issue of private prescription pricing has garnered.
We will continue to update our analysis with the latest announced prices, allowing SlimrChatters to track developments in real-time.
As SlimrChat co-founder Robert Price explains: “We have a lot of worried community members, and our role is to make this process easier for them. No single person can track all the changes, but together we can build a clearer picture. This helps people make real-life decisions about their health and their money.”
What comes next — and how you can get involved
SlimrChat will continue to track what members are actually paying once the new prices take effect. You can support the community by:
Posting updated prices from your pharmacy in the forum
Letting us know if you are continuing, switching, or pausing treatment
Sending screenshots or updates directly to [email protected]
By pooling our experiences, we can cut through the confusion, keep the facts straight, and ensure the SlimrChat community stays informed and supported.