Key facts
- NHS spending on Mounjaro has quadrupled in one year.
- Total spending on the drug now exceeds £500 million.
- Prescriptions rose from 1.1 million to 3.1 million.
- The period for this increase was between 2024/25 and 2025/26.
Spending by the UK's National Health Service (NHS) on the weight loss drug Mounjaro, also known as tirzepatide, has quadrupled over the past year, reaching more than £500 million. This expenditure now surpasses that of any other drug in the NHS formulary. The number of prescriptions for Mounjaro saw a significant increase, rising from 1.1 million in the 2024/25 fiscal year to 3.1 million in the 2025/26 fiscal year. The drug is colloquially referred to as the 'King Kong' of weight loss jabs.
