Mounjaro (tirzepatide) Injections

Mounjaro (tirzepatide) has been studied in clinical trials and is authorised by the Medicines and Healthcare products Regulatory Agency (MHRA) for weight management in eligible adults in the UK. Like all medicines, Mounjaro can cause side effects and may not be suitable for everyone. Your clinician will assess your health and medical history to make sure it’s an appropriate treatment for you.

The most common side effects of Mounjaro are digestive, including nausea, diarrhoea, constipation, and vomiting. These can be uncomfortable, but your myBMI clinician can help you manage side effects with medical advice. We also offer free side effects medication where necessary.

For more information, read our guide on the side effects of Mounjaro.

Everyone's timeframe for weight loss is different. Mounjaro starts working within hours, but most people start noticing appetite changes in 1-3 weeks, blood sugar improvements around 4-8 weeks, and weight loss in 3-6 months.

Whether Mounjaro is suitable for you will depend on a clinical assessment, including your body mass index (BMI), medical history and overall health. For weight management, Mounjaro is licensed for adults with a BMI of 30 or above, or a BMI between 27 and 30 with at least one weight-related health condition, such as high blood pressure, high cholesterol, prediabetes or type 2 diabetes. Your clinician will determine whether treatment is appropriate for you.

Mounjaro isn’t suitable for everyone, which is why you’ll need a clinical assessment before starting treatment. Certain health conditions, such as Medullary Thyroid Carcinoma (MTC) or Multiple Endocrine Neoplasia Syndrome Type 2 (MEN-2), your medical history, and other medicines you take may affect whether Mounjaro is appropriate for you. Always give your prescriber a complete and accurate medical history so they can assess whether you can use Mounjaro safely.

Yes. You don’t need to have diabetes to be prescribed Mounjaro for weight management. In the UK, it is licensed for adults with a BMI of 30 or above, or a BMI between 27 and 30 if they also have at least one weight-related health condition. A clinician will assess your individual circumstances to decide whether Mounjaro is suitable for you.

Mounjaro is licensed for use in adults aged 18 and over. It’s not approved for children or teenagers, as its safety and effectiveness in younger age groups haven’t been fully studied.

Older adults can use Mounjaro if their clinician confirms it’s safe based on their overall health and medications. If clinically safe, we prescribe Mounjaro for existing patients up to 85 years old. However, we do not prescribe to new patients over the age of 75 and advise they continue with their existing provider or speak to their GP.

There's no length of time you need to stay on Mounjaro. It's licensed for both weight loss and weight maintenance, so how long you take it will depend on your progress, goals, and weather it remains suitable for you. Your clinician can help you decide when or whether to stop treatment.

Mounjaro is available in six strengths:

• 2.5 mg
• 5 mg
• 7.5 mg
• 10 mg
• 12.5 mg
• 15 mg

Treatment starts at 2.5 mg once a week. After four weeks, the dose increases to 5 mg once a week. If needed, your prescriber can then increase your dose in 2.5 mg steps after you've spent at least four weeks on your current dose. The recommended maintenance doses are 5 mg, 10 mg and 15 mg, with 15 mg being the maximum weekly dose. Your prescriber will help determine the right dose and titration schedule for you.