Mounjaro is the brand name for tirzepatide, a prescription injectable medication manufactured by Eli Lilly. It was approved by the UK's Medicines and Healthcare products Regulatory Agency (MHRA) and has since become one of the most talked-about treatments for weight management and type 2 diabetes in Britain.
How Is Mounjaro Different?
Unlike older GLP-1 receptor agonists, Mounjaro is a dual-action medication. It targets both the GLP-1 and GIP receptors in your body, which are hormones involved in blood sugar regulation and appetite control. This dual mechanism is what sets tirzepatide apart from single-action treatments like semaglutide (Ozempic or Wegovy).
What Is Mounjaro Used For?
In the UK, Mounjaro is prescribed for:
- Type 2 diabetes — to improve blood sugar control alongside diet and exercise
- Weight management — for adults with a BMI of 30 or above, or 27 and above with at least one weight-related health condition
It is not approved for type 1 diabetes or for use in individuals under 18.
How Is It Taken?
Mounjaro is administered as a once-weekly subcutaneous injection using a pre-filled pen device called the KwikPen. You inject it into your abdomen, thigh, or upper arm, and you can choose any day of the week — as long as you keep it consistent. Each pen is single-use and comes with the needle already attached, making the process straightforward.
Availability in the UK
Mounjaro can be obtained through the NHS for eligible patients with type 2 diabetes following NICE guidance. For weight management, many UK patients access it through registered online pharmacies and private prescriptions. Prices vary significantly between pharmacies, which is why comparing costs through services like MedsLens can save you a considerable amount.
Is It Safe?
Mounjaro has been through extensive clinical trials — the SURMOUNT and SURPASS programmes — involving tens of thousands of participants. The most common side effects are gastrointestinal, including nausea and diarrhoea, particularly during the initial weeks. Serious side effects are rare but possible. It is always important to use Mounjaro under medical supervision and to report any concerning symptoms to your GP or prescriber.
Key Takeaways
- Mounjaro (tirzepatide) is a once-weekly injection for type 2 diabetes and weight management
- It is a dual GLP-1/GIP receptor agonist — the first of its kind
- Available in the UK via NHS and private prescription
- Prices vary — always compare pharmacy costs before purchasing