What is Mounjaro?
Mounjaro (Tirzepatide) is a clinically-proven weight loss medication available in the UK. It mimics your natural GLP-1 and GIP hormones to control appetite, reduce cravings and slow digestion, which supports lasting weight loss when combined with a healthy diet and exercise.
How does Mounjaro work?
Mounjaro mimics the gut hormones GLP-1 and GIP in order to suppress appetite, slow digestion and help you feel fuller for longer, leading to weight loss. It also helps regulate your blood sugar levels, which is helpful for weight and blood sugar management.
How long does Mounjaro take to work?
Mounjaro starts working immediately, but it may take a few weeks for you to see real changes. Some people need higher doses for the best results, but your Voy coach and clinical team will help you find the right dose.
Mounjaro dosage
- Month 1: Start with 2.5mg for the first four weeks
- Month 2: Increase to 5mg
- Month 3: Dose increases to 7.5mg
- Month 4: If tolerated, increase to 10mg
- Month 5: Option to increase to 12.5mg
- Month 6: Final increase to 15mg
Maintenance dose
This is the dose that best supports long-term weight loss by reducing hunger and cravings while minimising side effects. Your Voy clinical team will help you find the right level for sustained success.
Here’s everything you need to know in our full Mounjaro dosage guide.
How many doses are in a Mounjaro pen?
Each Mounjaro pen contains four weekly doses and includes a flow check before each use. After the fourth dose, the pen locks, so you can no longer access any remaining liquid. We’ll send you a new pen every four weeks to keep your treatment on track.
Side effects of Mounjaro
Before using Mounjaro, it's important to be aware of potential side effects. These are usually mild and occur when starting the medication or increasing your dose, as your body adjusts to the treatment. Side effects typically clear up on their own.
The most common side effects of Mounjaro include:
- Loss of appetite
- Nausea and vomiting
- Diarrhoea or constipation
- Headaches or dizziness
- Abdominal pain
- Fatigue
- Burping and flatulence
- Irritation, itching or bruising around where you have injected the medication
It's normal to experience side effects when you start taking Mounjaro or after increasing your dose. If you need support managing side effects, call our support line on 020 3912 9885 and press 2 to speak to a clinician within minutes (available Monday to Friday, 9 AM - 5 PM).
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