Reviewed By: Dr. John Lekkas GMC Registration: 7448560Last reviewed on: 25/10/2025
Mounjaro
- Once-weekly injection
- Active ingredient: Tirzepatide
- Trials show ~20% body weight loss
- Available alternative: Wegovy
- Manufactured by Eli Lilly
- * Combine it with regular physical activity and a well-maintained diet for best results.
Mounjaro is a weekly self-injectable weight loss medication containing the active ingredient tirzepatide. Each pack of Mounjaro comes in four weekly doses when ordered online at Mayfair Weight Loss Clinic. Tirzepatide regulates blood sugar levels and reduces appetite, triggering weight loss. Approved by the MHRA for weight management and type 2 diabetes, Mounjaro KwikPen (tirzepatide) has achieved unprecedented weight loss results in its clinical trials.
Each pack of Mounjaro contains 4 x weekly doses.
Prices include prescription
| 2.5 mg (4 x doses of 2.5 mg) | £189.00 |
| 5 mg (4 x doses of 5 mg) | £230.00 |
| 7.5 mg (4 x doses of 7.5 mg) | £306.00 |
| 10 mg (4 x doses of 10 mg) | £330.00 |
| 12.5 mg (4 x doses of 12.5 mg) | £347.00 |
| 15 mg (4 x doses of 15 mg) | £367.00 |
Buy Mounjaro Weight Loss Injection In the UK
Mounjaro is a new once-weekly Weight Loss Injection that helps with weight loss by reducing hunger and regulating blood glucose levels. It is injected weekly under the skin (subcutaneous injection). You can buy Mounjaro Weight Loss Injection online from our UK-registered Mayfair Weight Loss Clinic.
The active ingredient in Mounjaro is tirzepatide, which is prescribed for adults with obesity. It mimics hormones of your body’s GLP-1 and GIP that reduce hunger and regulate blood glucose levels in your body.
It is important to note that it is a prescription-only weight-loss medication. You will be able to buy Mounjaro after completing a short online consultation, which will be reviewed by our UK-registered doctors.
If approved, a prescription will be passed on to our pharmacy team for dispensing and delivery of the medication to your doorstep. Our doctors will prescribe you an alternative medication if Mounjaro does not suit your body.
Fill out the Free Consultation Form
Answer a few questions about your health so that our healthcare professionals can prescribe the appropriate treatment options.
Select Treatment
Select a suitable treatment following your consultation. We will give you the options based on the consultation completed.
Fast and Tracked Delivery
We will issue your prescription, dispense the medication, and deliver it to your selected address by tracked courier service.
What is Mounjaro?
Mounjaro is the brand name of the medication Tirzepatide, licensed for the treatment of Weight Management (weight loss and weight maintenance) and Type 2 diabetes. It is the latest and most effective weight loss drug, which was launched in February 2024.
It mimics the action of one of your body’s naturally occurring incretin hormones – GLP-1 and GIP (the first of its kind)– released after food intake. These regulate appetite, feeling of fullness, and blood glucose levels. Mounjaro is the first weight loss injection in its class that works by regulating blood glucose levels, satiety, and hunger.
Mounjaro for weight loss can be prescribed to those with a BMI of 30 and above or those with a BMI of 27-30 with at least one additional weight-related comorbidity, such as
- Obstructive sleep apnoea
- Osteo-arthritis
- Type 2 diabetes
- High blood pressure
- High cholesterol
In addition to controlling blood glucose levels, clinical trials of Mounjaro have shown significant weight loss in patients as well. As compared to other GLP-1 weight loss medications, it shows the most promising results.
While Tirzepatide may be prescribed off-label to help certain patients in their weight management, this will only be done as a second line at the discretion of the prescriber, and only when they are confident of the benefits this would have for their patient.
Mounjaro Summary
| Dose | Weekly one injection |
|---|---|
| Active pharmaceutical ingredient | Tirzepatide |
| Drug family | GLP-1 and GIP receptors agonist |
| How does Mounjaro work? | Mimics a naturally occurring hormone that makes you feel fuller. |
| Effectiveness | 15 – 20% loss in average patient |
| Price | From £39.75 per week |
How Much Does Mounjaro Cost?
Mounjaro prices start at £189.00 for a month’s supply at Mayfair Weight Loss Clinic. This price is inclusive of free online consultation by our healthcare professionals. This makes Mayfair Weight Loss Clinic the cheapest place to buy Mounjaro online in the UK. Each pack of Mounjaro includes four weekly doses. Get the lowest prices for Mounjaro today.
Mounjaro Price
The price of Mounjaro varies depending on the dosage and duration of your treatment.
2.5 mg Mounjaro (Starting)
The starting dose of Mounjaro is 2.5 mg, which costs £189.00 for 4 weeks. This dose helps your body to adjust to the medication. It is taken from week 1 to week 4 as your starting dose.
5 mg Mounjaro (Continuation Dose)
After the starting dose, the first continuation dose of Mounjaro is 5 mg, which costs £230.00 for 4 weeks. It is taken from week 5 to week 8 of starting the weight loss shot.
7.5 mg Mounjaro (Continuation Dose)
The second continuation dose of Mounjaro is 7.5 mg, which costs £306.00 for 4 weeks. It is preferably taken from week 9 to week 12 of your weight loss journey.
10 mg Mounjaro (Continuation Dose)
The third continuation dose of Mounjaro is 10 mg, which costs £330.00 for 4 weeks. It is prescribed from week 13 to week 16 of your weight loss journey.
12.5 mg Mounjaro (Continuation Dose)
The fourth continuation dose of Mounjaro is 12.5 mg, which costs £347.00 for 4 weeks. It is prescribed from week 17 to week 20 when the body has adjusted to the weight loss shot.
15 mg Mounjaro (Maintenance Dose)
The maintenance dose of Mounjaro is 15 mg, which costs £367.00 for 4 weeks. It is prescribed from week 21 onwards when your body has completely adjusted to the weight loss shot. This dose will continue for the remaining duration of your treatment.
Fill out the free online consultation form and start your weight loss journey!
How to use the Mounjaro Pen (KwikPen) for Weight Loss
Watch this step-by-step video instructions on how to use the Mounjaro Pen for weight loss. The video shows complete instructions for using the Mounjaro (tirzepatide) Injection.
Still have questions? Contact us
Where Can I Buy Mounjaro in the UK?
You can order Mounjaro online from Mayfair Weight Loss Clinic. We will ship the medication through tracked UK delivery after you fill out the free online consultation form and it is reviewed by the healthcare professionals.
How Is Mounjaro Taken?
Mounjaro is a once-weekly injection with the active ingredient Tirzepatide. Each pack of Mounjaro contains one pre-filled pen. The pen contains 4 doses of Mounjaro. The pen would either contain 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, or 15 mg.
Mounjaro can be used any time of the day, with or without meals. However, it’s recommended that you use it on the same day every week.
You can use your pen at any time of the day, with or without meals. You should use it on the same day each week if you can.
To adjust to the medication and avoid any severe side effects, you will start the medication with the lowest dose, 2.5 mg, for 4 weeks. You will eventually get to the maximum dose of 15 mg.
If your body is showing clear signs that it can tolerate Mounjaro, then the dosing schedule will be as follows:
- Weeks 1-4: 2.5 mg weekly
- Weeks 5-8: 5.0 mg weekly
- Weeks 9-12: 7.5 mg weekly
- Weeks 13-16: 10.0 mg weekly
- Weeks 17-20: 12.5 mg weekly
- Weeks 21 onwards: 15.0 mg weekly
How to inject Mounjaro?
Mounjaro is injected under the skin (subcutaneous injection) of your stomach area (abdomen) two inches apart from the naval area or upper leg (thigh). It is recommended that you switch the site of injection every week to minimise the chances of injection site infections.
You can download and read the patient information leaflets (PIL) for each dose of Mounjaro here: Patient information leaflet.
Click here to download the instructions for use on how to inject Mounjaro KwikPen
What are the side effects?
Like every medication, Mounjaro/Tirzepatide can have side effects. These side effects and their intensity differ from person to person. You might not experience them for yourself.
The most common side effects of Mounjaro include:
- Diarrhoea
- Feeling sick (nausea)
- Being sick (vomiting)
- Constipation
- Indigestion
- Decrease in appetite
- Stomach (abdominal) pain
As your treatment continues and your body starts to adapt to the new medication, you will notice these side effects easing.
A full list of side effects and more information can be found on the patient information leaflet. Make sure that you have read all the information and are completely aware of the potential side effects.
Who Can Use Mounjaro?
The weekly weight loss pen, Mounjaro, is suitable for those with a BMI above 30 (or 27 with weight-related comorbidity). Once you complete the online consultation, you will be assessed by the prescriber on factors like your BMI, medical history, and current medication.
Mounjaro is not suitable and will not be prescribed to you if you fall into any of the following categories.
- Below 18 years of age.
- You are pregnant, actively trying to get pregnant, or breastfeeding.
- Anyone who has severe kidney or liver problems.
- Type 1 diabetic patients or you are taking diabetic medication that may cause hypoglycemia, such as insulin or sulphonylureas (e.g., Gliclazide).
- You have eating disorders or have had them in the past.
- Are currently taking other weight loss drugs or medication that contain GLP-1 or work in the same way as Mounjaro, e.g., Byetta, Victoza, Ozempic, Saxenda, Trulicity, Wegovy.
- You suffer from slow digestion, severe gastroparesis, or other food digestion-related problems.
- You’ve had pancreatitis (inflammation of the pancreas that may cause severe pain in the stomach and back that does not go away).
- You have diabetic retinopathy, macular edema, or other eye problems.
- You or anyone in your family have had thyroid cancer called medullary thyroid carcinoma (MTC).
- You are suffering from Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
- If you are allergic to the medication, Mounjaro, or any of its ingredients.
FAQs
What’s the difference between Mounjaro and Zepbound?
They are both identical medicines containing the same active ingredient (tirzepatide) and work in the same way. The only difference lies is in their names: Zepbound is the US name for this weight loss injection, while it is licensed under the brand name Mounjaro in the UK. Moreover, Zepbound is not licensed for use in the UK.
You should not take both medications at the same time as they work in very similar ways and could produce dangerous side effects if taken together.
Switching from Wegovy to Mounjaro?
They are both identical medicines containing the same active ingredient (tirzepatide) and work in the same way. The only difference lies is in their names: Zepbound is the US name for this weight loss injection, while it is licensed under the brand name Mounjaro in the UK. Moreover, Zepbound is not licensed for use in the UK.
How effective is Wegovy and how much weight can I expect to lose?
Whereas the trials have shown this to be very effective in the majority of patients taking it, like any medication, it is not guaranteed to work for you. You may either not tolerate it (have severe side effects) or not respond to it and find that it does not work for you. The clinical trial by the manufacturers (STEP 1) showed that patients using Wegovy achieved an average weight loss of 14.9%. Of those:
- Almost 84% achieved a weight loss of less or equal to or greater than 5%
- Over 66% achieved weight loss equal to or greater than 10%
- Almost 50% achieved weight loss of over 15%
- Over 30% of patients lost more than 20% of their starting body weight.
Alongside taking wegovy, it is important to maintain a healthy diet and increase in physical activity.
How long does it take for Wegovy to work?
The weight loss injection Wegovy is a long-term medication. Proper lifestyle changes and switching to a healthy diet would result in the best results. If taken properly, you could start noticing changes in as early as 4 weeks. However, you must follow the diet and continue medication for consistent results. Results may vary according to the person, as everyone has different health conditions. It is best to consider your weight loss journey as a marathon, not a sprint.
Does Wegovy help in burning fat?
No, Wegovy does not help you burn fat. Rather, it mimics a natural hormone responsible for appetite, keeping you fuller for longer. It also reduces cravings and makes sure that you are not overeating. You can burn fat by incorporating physical activities into your routine and consistently following a healthy diet to restrict calorie intake.
Where to get Wegovy without a prescription?
Wegovy is a prescription-only weight-loss medication and is not available without a prescription. If there are any providers selling Wegovy without a medical consultation or against a prescription, then this is not legal, and they should be avoided for safety reasons. Hence, you can not buy it without a prescription. At Mayfair Weight Loss Clinic, you can order Wegovy online, and our in-house UK-based prescribers will issue a prescription after the consultation is completed. We offer tracked courier delivery service, usually next-day doorstep delivery to your nominated address within the UK mainland with discreet packaging. You can, therefore, get the Wegovy prescription online without a physical appointment.
Are there any over-the-counter versions of Wegovy available?
There are no over-the-counter versions of Wegovy available in the UK. There are some medications claiming weight loss, and some do result in weight loss, but none of those medications offer the same level of effectiveness.
Can I take Wegovy with other weight loss medication?
How long do Mounjaro side effects last?
The most common side effects of Mounjaro include headache, vomiting, nausea, stomach ache, and low blood sugar. Almost all of these side effects are seen when the body is adapting to the new weight loss injection.
The side effects start to fade once your body gets used to the new weight loss medication. Your body adapts to the new weight loss treatment in about 4 weeks. However, it may differ from person to person.
Can Mounjaro cause hair loss?
Yes, hair loss is one of the mentioned side effects in the patient information leaflet. Check out the patient information leaflet for further information.
How to get a Mounjaro prescription online?
Please fill out our free online consultation form. We need your medical information to evaluate your overall health. If, according to our evaluation, you qualify for the treatment, we will prepare you a valid prescription.
Are Mounjaro and Ozempic the Same?
No, Mounjaro and Ozempic are two different medications. Although both medications are manufactured for the treatment of type 2 diabetes and controlling blood sugar levels, both have different active ingredients.
Ozempic has the active ingredient Semaglutide, whereas Mounjaro has the active ingredient Tirzepatide. Although both medications are GLP-1 receptor agonists, Mounjaro is also a GIP mimetic.
Are Mounjaro and Wegovy the Same?
No, Moujnaro and Wegovy are two distinct medications manufactured by different manufacturers with different active ingredients. Mounjaro is manufactured by Eli Lilly and has the active ingredient Tirzepatide, while Wegovy is manufactured by Novo Nordisk and has the active ingredient Semaglutide.
Both medications are approved for weight loss treatments. However, Mounjaro is unavailable in the UK. Plus, both medications make you feel fuller for longer, helping you cut down on extra calories. Both treatments are GLP-1 receptor agonists.
However, Mounjaro is also GIP mimetic, offering dual action. It mimics two hormones at the same time, helping in weight loss and supporting blood glucose levels.
GMC Registration: 7448560
Dr John Lekkas is a GMC registered medical doctor with a specialist PhD, and is a global leading expert in weight loss and aesthetic medicine.
Last reviewed on: 25/10/2025