Mounjaro is a once-weekly weight loss injection that contains tirzepatide. It can help reduce appetite, support fullness, and make it easier to manage your weight when used alongside a reduced-calorie diet and increased physical activity.
Mounjaro is the brand name for tirzepatide, a prescription medicine licensed in the UK for weight management in adults with obesity or adults who are overweight and have at least one weight-related health condition.
It works by acting on two hormone pathways, GLP-1 and GIP, which are involved in appetite, fullness, digestion, and blood sugar control. By helping you feel fuller for longer and reducing hunger, Mounjaro can make it easier to follow a healthier eating plan.
How effective is Mounjaro for weight loss?
Mounjaro can support significant weight loss when used consistently with diet and physical activity. In a major clinical trial, adults taking tirzepatide lost more weight than those taking placebo, with the highest dose linked to average body weight reductions of around 20.9% after 72 weeks.
Your result may be higher or lower depending on your starting weight, dose, diet, activity level, side effects, and how consistently you use treatment. Mounjaro is not a quick fix, and it works best as part of a long-term weight management plan.
Mounjaro: How does it work?
Only take 1 dose a week
Mounjaro injections are easy to use. You’ll only ever need to take it once a week, so you’ll never need to worry about it affecting your routine.
Lose 20% of your starting body weight
If you consistently use Mounjaro weight-loss injections alongside physical activity and a healthy diet, you’ll be able to lose a significant amount of weight in just over a year.
Inject at home or on the go
Mounjaro pen injectors are easy to carry and use. It doesn’t matter if you’re at home, work or travelling, you can inject wherever you are.
To start your weight loss treatment and help our pharmacists understand your needs, you'll need to have a video consultation with a member of our team. Once approved, our team will stay in regular contact to approve your future use of our weight loss medicines.
Mounjaro may be suitable if you are an adult and have:
- A BMI of 30 or above
- A BMI of 27 to 30 and at least one weight-related health condition, such as high blood pressure, high cholesterol, prediabetes, type 2 diabetes, sleep apnoea, or cardiovascular disease
Mounjaro may not be suitable if you are pregnant, breastfeeding, planning a pregnancy, under 18, allergic to tirzepatide, or have certain medical conditions. During your consultation, our pharmacy team will check your health history, current medicines, BMI, and treatment goals before deciding whether Mounjaro is appropriate.
How do you take Mounjaro?
There might not be a Mounjaro pill, but Mounjaro comes in a no-nonsense injectable form. Mounjaro is taken once a week using a pre-filled injection pen, and for best results you should try to use it on the same day each week. Your starting dose is usually 2.5mg once weekly for 4 weeks. Your prescriber may then increase your dose gradually, depending on your progress and how well you tolerate treatment. Do not change your dose unless your prescriber tells you to.
Choose your injection site
You can inject your pen into your tummy, arm or thigh. Make sure to change the site regularly to avoid injury or bruising. You should also use an alcohol swab to clean the injection site.
Prepare your pen
Take off the cap and press it against your chosen injection site. Unlock the pen by twisting it. If it's your first time, speak to your prescriber for guidance on how to use your injection pen.
Inject your dose
When you are ready, press and hold the top of the pen. You will hear 2 clicks, 1 at the start of the injection and 1 at the end. Wait 10 seconds to hear both clicks.
If you miss a dose and it has been 4 days or less, take it as soon as you remember. Then take your next dose on your usual scheduled day.
If more than 4 days have passed, skip the missed dose and take your next dose as normal. It's better to miss a dose than to double up.
Like all medicines, Mounjaro can cause side effects. The most common are digestive symptoms, especially when starting treatment or increasing the dose. Common side effects may include:
- Nausea
- Vomiting
- Diarrhoea
- Constipation
- Stomach pain
- Indigestion
- Reduced appetite
- Injection site reactions
Most side effects are mild to moderate and improve over time, but some people may need dose adjustments or a different treatment. Seek medical advice urgently if you develop severe or persistent stomach pain, signs of dehydration, or symptoms of an allergic reaction.
Tell your pharmacist if you use oral contraception, including the combined pill or progestogen-only pill. Mounjaro may reduce how well oral contraceptives are absorbed when you first start treatment or after a dose increase.
You may be advised to switch to a non-oral contraceptive method or add a barrier method such as condoms for 4 weeks after starting Mounjaro and for 4 weeks after each dose increase.
Mounjaro should not be used during pregnancy or while trying to become pregnant.
| Dose | Price |
|---|---|
| 2.5 mg | £149 |
| 5 mg | £189 |
| 7.5 mg | £249 |
| 10 mg | £289 |
| 12.5 mg | £309 |
| 15 mg | £319 |
Why choose Well Pharmacy?
With Well Pharmacy, you can start your weight loss consultation online and receive support from qualified pharmacy professionals. If approved, your treatment plan will include guidance on using your pen, managing side effects, building healthier habits, and staying on track safely.
Our service is designed to make weight management more supported, more convenient, and clinically appropriate from the start.
Yes. Mounjaro is licensed in the UK for weight management in eligible adults. It is also used for type 2 diabetes.
Some people notice changes in appetite within the first few weeks, but weight loss usually builds gradually over months. The best results are seen with consistent use, lifestyle changes, and ongoing clinical support.
Mounjaro is designed to be used alongside a reduced-calorie diet and increased physical activity. It can make those changes easier, but it does not replace them.
When used consistently and combined with regular exercise and a healthy, balanced diet, patients could lose up to 20% of their starting body weight.
Our experienced pharmacists will talk you through your options for weight-loss treatments in your initial personal video consultation. However, in some instances, we may determine that weight-loss medications such as Mounjaro injections are not a suitable choice.
There are several reasons why you may not be eligible to use Mounjaro weight-loss injections, including if:
- You are under the age of 18
- You are over the age of 75
- You are pregnant, planning on getting pregnant or currently breastfeeding
- You are allergic to any of the active ingredients in Mounjaro
- You have an initial BMI of under 27, unless you are already using the medication or wish to transfer your treatment
- You have an initial BMI of 27 to 30 and you don't have a weight-related health condition
Some medical conditions may also make you ineligible for Mounjaro injections, including:
- Renal (kidney) impairment
- Congestive heart failure
- Hepatic (liver) impairment
- A thyroid disease
- Inflammatory bowel disease
- A history of pancreatitis
- An eating disorder
- Diabetic gastroparesis
- Obesity secondary to endocrinological
No. Mounjaro is a prescription-only medicine in the UK. You should only use it after a clinical assessment from a qualified prescriber.
Mounjaro and Wegovy are both weekly weight loss injections, but they contain different active ingredients. Mounjaro contains tirzepatide, while Wegovy contains semaglutide. The best option depends on your health history, treatment response, side effects, and prescriber advice.
Although there are no known foods or drinks that interact with Mounjaro, there are several things you should try to avoid to ensure you achieve your weight-loss goals.
- Foods with high sugar content: Sweets, cakes, fizzy drinks, biscuits and the like.
- Fried foods: Bacon, sausages, chips, burgers and fried eggs contain high levels of unhealthy fats, which may increase the risk of nausea while taking Mounjaro weight-loss injections.
- High glycaemic index fruit and vegetables: Mango, sweetcorn, potatoes, pineapple and watermelon can cause your blood sugar levels to spike.
Additionally, you should avoid drinking alcohol while taking Mounjaro as this can make some of the common side effects of the medication such as nausea, vomiting and diarrhoea worse.
We also prescribe two other types of weight-loss medication at Well Pharmacy. Wegovy is a self-injectable medication that can be taken weekly. We can also prescribe orlistat as part of our weight management services, which comes in the form of a capsule and is taken three times a day.
If our clinicians find that you are not suitable for weight-loss medication or you would like to explore other options, our pharmacists can share a wealth of expert advice on different ways you can reach your weight-loss goals. From exercise regimes to healthy eating advice, we can offer you the support you need.
To find out more about how you can work towards becoming a happier, healthier version of yourself, be sure to check out our Health hub.
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