Reviewed By: Dr. John Lekkas
GMC Registration: 7448560
Last reviewed on: 20/07/2026Shipping Across the UK
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Mounjaro Injection
Medication Features
Mounjaro is a prescription-only weight loss injection in the UK. It is prescribed to support weight management in adults where excess weight may affect long-term health. Mounjaro works by reducing appetite and helping you feel fuller between meals. It is fully licensed and approved for weight loss in the UK.
Treatment begins only after a medical assessment confirms suitability. It works alongside lifestyle changes rather than replacing them and is intended for steady, clinically supervised progress rather than rapid results.
Simply fill in a free consultation form. Our clinical team will review your details and prescribe a suitable treatment. Home delivery is discreet, and essential supplies such as needles or sharps bins can be arranged during the assessment process if needed.
Reviewed By: Dr. John Lekkas
GMC Registration: 7448560
Last reviewed on: 20/07/2026Shipping Across the UK
Cold-Chain Transportation
UK Mainland Weekday delivery
Channel Islands (Two-day delivery service)
Northern Ireland (one to two-day delivery service)
Shipped Monday - Friday
What is Mounjaro (Tirzepatide)?
Mounjaro is a prescription-only weight loss injection containing the active ingredient tirzepatide. It is prescribed for eligible adults living with obesity or overweight alongside certain weight-related health conditions as part of a clinically supervised weight management programme. Administered once a week using a pre-filled injection pen, Mounjaro is designed to support long-term weight management when combined with a balanced diet and regular physical activity.
Unlike conventional weight loss medicines, Mounjaro works through a dual-action approach that helps regulate appetite and support sustainable weight management.
Fill out the Online Form
Fill out our online consultation form with valid and accurate patient information and medical conditions.
Select Treatment
Select the weight loss treatment you are prescribed. We will suggest the options based on your eligibility.
Track & Receive
Your treatment will be dispensed and delivered to your doorstep by a tracked courier service.
How does Mounjaro work in the body?
The active ingredient in Mounjaro, tirzepatide, works by activating GLP-1 and GIP receptors, which are involved in regulating appetite, digestion and blood sugar levels. This dual-action approach helps improve feelings of fullness, reduce hunger and support healthier eating habits, making it easier to achieve sustainable weight loss.
It works by:
- Helping you feel fuller for longer after meals
- Reducing hunger and food cravings
- Slowing stomach emptying to prolong feelings of fullness
- Supporting healthy blood sugar regulation by improving insulin release when needed
Together, these effects help reduce overall calorie intake and support long-term weight management when combined with a balanced diet and regular physical activity.
How much weight could you lose with Mounjaro in one year?
* Based on the results of a peer-reviewed clinical study of 2539 participants.
Who is eligible for Mounjaro?
Access to Mounjaro injection in the UK is based on a structured medical review carried out through an online consultation. It may be considered for adults who meet at least one of the following criteria:
A Body Mass Index (BMI) of 30 or higher
A BMI of 27 or higher with a weight-related health condition, including:
- Type 2 diabetes or pre-diabetes
- High blood pressure
- Raised cholesterol
- Obstructive sleep apnoea
BMI provides guidance, but it is not the only factor. A UK-licensed prescriber makes the final decision after reviewing your full medical history. Always read the patient information leaflet before starting treatment.
How long does Mounjaro take to work?
Mounjaro begins working after your first injection, although the time it takes to notice its effects varies from person to person. Some people experience reduced appetite and fewer food cravings during the first week, while noticeable weight loss typically develops over the following weeks as treatment progresses and healthy lifestyle changes are maintained.
Mounjaro is introduced using a gradual dose escalation schedule to help improve tolerability and reduce the risk of gastrointestinal side effects. Regular clinical reviews help ensure your treatment is progressing safely and that your prescribed dose remains appropriate for your weight management goals.
How effective is Mounjaro?
Mounjaro has been shown in clinical studies to support clinically meaningful weight loss when used alongside a reduced-calorie diet and regular physical activity. While individual outcomes differ, participants receiving the 15 mg dose achieved an average weight loss of 22.5% of their starting body weight over 72 weeks.
Clinical trial results also demonstrated that many participants achieved clinically meaningful weight loss milestones:
- 96.3% achieved at least 5% weight loss
- 90.1% achieved at least 10% weight loss
- 78.2% achieved at least 15% weight loss
- 62.9% achieved at least 20% weight loss
The amount of weight you lose will depend on a range of individual factors, including:
- Your starting body weight
- Your prescribed Mounjaro dose
- Following a balanced diet
- Regular physical activity
- Your overall health and response to treatment
The image below highlights the average weight loss achieved across different Mounjaro doses during clinical studies.
Disclaimer: Weight loss results vary between individuals and cannot be guaranteed. The data presented is based on clinical trial evidence published in the official Summary of Product Characteristics (SmPC) for Mounjaro.
Expected weight changes across Mounjaro dose levels
Average weight reduction tends to increase as doses rise, although individual responses vary. Some people achieve meaningful progress at lower doses, while others require higher maintenance doses under clinical supervision.
Note: These figures are based on a 72-week clinical study comparing treatment outcomes with placebo.
Mounjaro weekly dosage and schedule
Mounjaro weight loss injection follows a gradual dose-escalation schedule to help the body adjust safely. Treatment begins at a lower dose, with increases typically made every four weeks. Six dose strengths are available, with 15mg used as the maximum maintenance dose. Our prescriber will guide you through the recommended dose progression based on how you respond.
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 Mounjaro.
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 Mounjaro. This dose will continue for the remaining duration of your treatment.
Where should I inject Mounjaro injection?
Mounjaro injection for weight loss can be injected into the stomach area, thigh, or upper arm. Rotating injection sites each week helps minimise skin irritation. While you may continue using the same general area, it is ideal to avoid injecting into the same spot repeatedly.
Choose an area: abdomen or thighs.
Select a site for administering the injection.
Make four divisions on the site. Inject into one division per week.
When injecting into the abdomen ensure a 5 cm distance from the navel.
The Mounjaro injection location can affect how the medication feels for some individuals. When appetite control is the main focus, some people prefer abdominal injections, though effectiveness varies from person to person.
How to inject Mounjaro pen: Video demonstration
A step-by-step video guide is available to support the correct use of the Mounjaro weight loss injection. It demonstrates preparation, injection technique, and disposal, helping you feel confident administering treatment at home. Clinical support remains available if you need further assistance during treatment.
Still have questions? Contact us or call (020) 7550 6515
Table of Contents
- How much weight can you realistically lose on Mounjaro?
- Who can not use Mounjaro
- What foods should you eat while taking Mounjaro?
- What are the side effects of Mounjaro?
- Mounjaro warnings and risks
- Mounjaro interactions
- Can I use Mounjaro long-term?
- How often should Mounjaro be taken?
- What happens if I miss a dose of Mounjaro?
- What happens when you stop taking Mounjaro?
- How long do side effects last, and are there long-term side effects?
- Ways to prevent side effects
- How should I store Mounjaro?
- Mounjaro interactions with other medications
- Where can I buy Mounjaro online UK
- How much does Mounjaro cost
- How to buy Mounjaro online UK from Mayfair Weight Loss Clinic
- Mounjaro vs Wegovy: What’s the difference?
How much weight can you realistically lose on Mounjaro?
Clinical studies suggest that many adults using Mounjaro may achieve gradual and sustained weight reduction when treatment is combined with balanced eating habits and regular physical activity. Individual results vary depending on factors such as starting weight, dose progression, lifestyle habits, and overall health.
Note: Data sourced from the SURMOUNT-1 clinical study evaluating once-weekly tirzepatide for weight management.
Expected Average weight loss on different Mounjaro doses
| Time on Treatment | Possible Average Weight Reduction* |
|---|---|
| 4 weeks | 4% |
| 8 weeks | 5–6% |
| 12 weeks | 9–12% |
| 13 weeks onwards | 13% |
Note: Data sourced from the electronic Medicines Compendium (emc) Summary of Product Characteristics for Mounjaro.
Average Weight Reduction Seen in Clinical Studies
| Treatment Dose | Average Weight Reduction Reported* |
|---|---|
| 5mg | 16% |
| 10mg | 21% |
| 15mg | 22.5% |
Results vary between individuals and depend on factors such as treatment adherence, eating habits, physical activity, dose tolerance, and overall health.
Who can not use Mounjaro?
Do not use Mounjaro if you:
- Are pregnant, planning a pregnancy, or breastfeeding
- Have a personal or family history of medullary thyroid cancer or MEN2
- Have a known allergy to tirzepatide or any components of the pen
- Are under 18 years of age
- Have a history of eating disorders or unexplained weight loss
You should discuss your medical history in detail if you have:
- Diabetic retinopathy
- Significant kidney or liver impairment
- Gastroparesis or delayed stomach emptying
- A previous episode of pancreatitis
Extra caution is required if you use other diabetes treatments. Combining Mounjaro injection for weight loss with insulin or similar medicines may increase the risk of low blood sugar and requires close monitoring.
To determine suitability, a full clinical assessment is required through the free online consultation.
What foods should you eat while taking Mounjaro?
While no single eating plan is required during Mounjaro treatment, making nutritious food choices can help maximise your weight loss results and support overall wellbeing. Prioritising protein-rich foods, fibre and minimally processed ingredients may also help you stay fuller for longer and manage common digestive side effects experienced during treatment.
Foods to Include
- Lean sources of protein
- Fibre-rich vegetables and fruit
- Wholegrain carbohydrates
- Healthy unsaturated fats
- Plenty of water to stay hydrated
Foods to Limit
- Fried and high-fat foods
- Sugary foods and sweetened drinks
- Highly processed foods
- Large or heavy meals
- Excess alcohol
What are the side effects of Mounjaro?
Side effects may occur as your body adjusts to treatment, particularly during early stages or following dose increases. Digestive symptoms are the most commonly reported and are often temporary.
Very common side effects
- Nausea
- Vomiting
- Diarrhoea
- Constipation
- Indigestion
These symptoms often settle as treatment continues. Seek advice if they persist or worsen.
Common side effects
- Abdominal discomfort
- Dizziness
- Fatigue
- Bloating
- Gas
- Injection site redness or swelling
Uncommon side effects
- Increased heart rate
- Skin reactions such as rashes or eczema
- Altered taste
- Slower stomach emptying
Serious side effects (Rare)
- Pancreatitis:Severe abdominal pain that may radiate to the back, with or without vomiting. Urgent medical care is required.
- Gallbladder problems:Sudden pain in the upper right abdomen, sometimes spreading to the shoulder. Seek immediate attention.
- Severe allergic reaction:Difficulty breathing or swelling of the face, lips, or tongue requires urgent emergency care.
Most side effects subside over a period of time. If symptoms are persistent or difficult to manage, speak with our clinician. Simple dietary adjustments, such as smaller meals, may help ease digestive discomfort. Always refer to the Patient Information Leaflet for full safety details.
Contraindications and precautions
A Mounjaro online prescription requires medical approval and is not suitable for all patients. Individuals who are allergic to tirzepatide or any of the ingredients in the injection should avoid using it. It is important to share any history of allergies with a qualified prescriber, as reactions can differ from person to person and may affect whether this treatment is appropriate.
Before starting Mounjaro for weight loss, you should inform your prescriber if you currently have or have previously experienced any of the following conditions:
- A history of pancreatitis
- Depression, anxiety, or other mental health concerns
- Gastrointestinal conditions such as delayed stomach emptying (gastroparesis)
- Kidney impairment or reduced kidney function
- Pregnancy, planning pregnancy, or breastfeeding
- Liver disease or abnormal liver function
- Diabetes, particularly if you are using insulin or other glucose-lowering medicines
The weight loss injection Mounjaro may be prescribed to some individuals with type 2 diabetes, but careful monitoring of blood sugar levels is required. Certain diabetes treatments may need to be adjusted or avoided to reduce the risk of low blood sugar.
You should also discuss all medicines you are currently taking with your prescriber. This includes prescription drugs, over-the-counter products, and herbal supplements. Some treatments may interact with Mounjaro, especially insulin or medicines that increase insulin release.
Before beginning treatment, always read the Patient Information Leaflet provided with your medication. It contains essential guidance on how to use Mounjaro safely, including dosing instructions, potential side effects, and important precautions.
Mounjaro warnings and risks
Mounjaro requires careful medical consideration before use. Do not start treatment if you have a known allergy to tirzepatide or any component of the injection pen.
Some people may face higher risks when using tirzepatide in the UK, particularly if they have certain medical conditions. Report any existing health issues to our clinical team so they can assess safety and suitability.
- Pancreatic inflammation
- Severe digestive disorders, including delayed stomach emptying
- Gallbladder complications
- Serious allergic responses
- Significant gastrointestinal problems
- Low blood sugar, especially when combined with diabetes medicines or taken incorrectly
Promptly report new symptoms or side effects so our clinical team can manage treatment safely.
Mounjaro interactions?
Mounjaro can affect blood sugar control when combined with insulin or sulfonylureas, increasing the risk of hypoglycaemia. This risk rises when multiple diabetes treatments are used together.
Before starting treatment, provide a full list of all medicines you take, including prescriptions, pharmacy products, and supplements. This information allows our clinical team to adjust treatment safely.
Can I use Mounjaro long-term?
Long-term use of Mounjaro depends on your health status, treatment goals, and response over time. Some people continue treatment to help maintain weight loss or support blood sugar stability.
If you stop treatment without maintaining lifestyle changes, weight regain can occur. Discussing a long-term plan with our clinical team before stopping helps protect the progress you have made.
Regular clinical reviews play an essential role in confirming that ongoing treatment remains appropriate and safe.
How often should Mounjaro be taken?
Mounjaro is taken once a week and does not depend on meals or time of day. Choose a consistent day and time that fits easily into your routine.
Setting reminders can help maintain consistency. If you need to change your injection day, leave at least 72 hours between doses. Avoid frequent schedule changes, as consistency supports treatment effectiveness.
What happens if I miss a dose of Mounjaro?
If you miss a dose, take it as soon as possible within 96 hours of your scheduled time. If more than four days have passed, skip the missed dose and continue on your usual injection day.
Important:
If more than two weeks have passed since your last dose, contact our prescriber for advice. Do not take double doses to make up for a missed injection, as this increases side-effect risk without improving results. You can also read our guide on what to know before missing a dose of Mounjaro for more detailed advice.
When changing injection days, always allow a minimum 72-hour gap before restarting on the new schedule.
When should I order my next dose?
If your treatment plan involves increasing your dose, it is usually recommended to wait until after your third injection before ordering the next strength. This helps ensure your current dose is being tolerated properly before moving up.
Although it is possible to place an order several weeks in advance, side effects or treatment changes during that time may affect whether a higher dose is still suitable. Any unopened Mounjaro pens ordered early should be kept refrigerated until needed.
What happens when you stop taking Mounjaro?
After stopping Mounjaro, appetite regulation gradually reduces as the medication leaves your system. Hunger may increase, which can raise the likelihood of weight regain without consistent habits.
Clinical data show that weight regain can occur after stopping treatment. Mounjaro weight loss in the UK is associated with how the medication works in the body, typically clearing within around 25 days, while appetite-related hormone activity may normalise sooner.
Maintaining balanced nutrition and regular activity helps limit regain. Speaking with a healthcare professional before stopping allows you to plan a controlled transition.
How long do side effects last, and are there long-term side effects?
Many people notice side effects improve within days or weeks as the body adjusts to Mounjaro treatment. Common side effects may include nausea, vomiting, stomach discomfort, headache, diarrhoea, constipation, and occasionally low blood sugar. Dose increases can sometimes temporarily bring symptoms back during the early stages of treatment.
For most adults, these effects become milder over time as the body adapts to the medication. If symptoms continue or worsen, treatment should be reviewed by a prescriber. You can also read our guide on how long Mounjaro side effects may last and what to expect for more detailed information. Current evidence has not confirmed long-term adverse effects directly linked to Mounjaro, although ongoing safety monitoring continues.
Ways to prevent side effects
You can reduce side effects by:
- Drinking fluids regularly throughout the day
- Eating smaller, more frequent meals
- Choosing simple foods if digestion feels sensitive
- Following prescribed dosing schedules without rushing increases
Give your body time to adapt before adjusting doses. In some cases, pharmacy treatments such as antacids or gentle laxatives may help. You can also read our guide on how to manage nausea while using the Mounjaro pen for additional practical strategies that may help reduce discomfort.
How should I store Mounjaro?
Store Mounjaro in a refrigerator between 2°C and 8°C and never freeze it. You may keep a pen at room temperature below 30°C for up to 30 days once removed from the fridge.
Keep pens in their original packaging to protect them from light. Always check expiry dates and dispose of used pens and needles using proper sharps containers.
Mounjaro interactions with other medications
Using Mounjaro with insulin, sulfonylureas, or similar diabetes medicines can increase the risk of low blood sugar.
Tell our clinical team about all medicines and supplements you use before starting treatment. This allows safe planning and reduces avoidable risks.
Where can I buy Mounjaro online UK
If you’re wondering where to buy Mounjaro in the UK, it’s important to know this is a prescription-only treatment. It cannot be supplied without a clinical assessment from a licensed prescriber.
Patients looking to buy Mounjaro online in the UK must complete a regulated consultation where a healthcare professional reviews medical history, BMI, and treatment suitability. This ensures the medication is appropriate and protects against counterfeit supply.
Mounjaro contains tirzepatide, which is why some patients search for options to buy tirzepatide in the UK. However, the access process remains the same and requires medical approval. At Mayfair Weight Loss Clinic, eligible patients receive a prescription following consultation, with medication dispensed through a registered UK pharmacy. This ensures safe access to genuine treatment under proper clinical supervision.
How much does Mounjaro cost
The cost of Mounjaro in the UK depends on the prescribed dose and stage of treatment. As patients progress through higher doses, the Mounjaro price and overall Mounjaro injection cost increase in line with the structured programme.
Mounjaro pricing guide:
- Mounjaro 2.5 mg (4 weeks): £189
- Mounjaro 5 mg (4 weeks): £230
- Mounjaro 7.5 mg (4 weeks): £306
- Mounjaro 10 mg (4 weeks): £330
- Mounjaro 12.5 mg (4 weeks): £347
- Mounjaro 15 mg (4 weeks): £367
All plans include:
- Medical assessment and prescription
- Medication supplied by a registered UK pharmacy
- Ongoing clinical monitoring and support
For best results, treatment should be combined with a balanced diet and regular physical activity under medical guidance.
How to buy Mounjaro online UK from Mayfair Weight Loss Clinic
Starting treatment is straightforward and designed around patient safety.
- Step 1: Complete an online consultation with your medical details
- Step 2: A qualified prescriber reviews your eligibility
- Step 3: If approved, your prescription is issued
- Step 4: Medication is dispatched from a UK-registered pharmacy
- Step 5: You receive ongoing support and dosage guidance
This structured process ensures that when you buy Mounjaro online in the UK, you are accessing treatment safely, with full clinical oversight throughout your journey.
Mounjaro vs Wegovy: What’s the difference?
Mounjaro and Wegovy are both prescription-only weight loss injections available in the UK. Although both help reduce appetite and support long-term weight management, they contain different active ingredients and work in different ways, which may influence weight loss outcomes and treatment suitability.
Note:Weight loss data is based on published clinical trial results and the official Summary of Product Characteristics (SmPC) for Mounjaro and Wegovy.
Key differences between Mounjaro and Wegovy
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Average weight reduction | Up to 22.5% of starting body weight* | Around 21% of starting body weight* |
| Starting price at Mayfair | From £189 | From £139 |
| Active ingredient | Tirzepatide | Semaglutide |
| How it works | Dual-action GIP and GLP-1 receptor agonist | GLP-1 receptor agonist |
| Dose range | 2.5 mg to 15 mg | 0.25 mg to 7.2 mg |
| Manufacturer | Eli Lilly | Novo Nordisk |
The most appropriate treatment depends on your medical history, weight management goals and a clinical assessment by our clinician.
What our customers say
We pride ourselves on great customer service. Here are some comments left by our customers.
Michelle
Very easy and quick consultation process. Weight loss pens arrived the next day.
Mary
Friendly customer service team, responded promptly and professionally to my questions.
Amy
Ordered on Tuesday and it arrived on Wednesday morning. Very well packed. Excellent service.
FAQs
Ordering Mounjaro online from Mayfair Weight Loss Clinic is a straightforward process:
- Complete an online consultation by providing details about your medical history, current health and weight management goals. You may also be asked to upload photographs to support your assessment.
- Clinical review by a UK-licensed prescriber, who will determine whether Mounjaro is suitable for you.
- Receive your prescription, which is dispensed by a GPhC-regulated pharmacy if treatment is approved.
- Choose discreet home delivery to your preferred address.
- Access ongoing clinical support, including follow-up consultations through your patient account throughout your treatment.
Other prescription weight loss treatments include Wegovy, Saxenda and other clinically approved medicines. The most appropriate treatment will depend on your medical history, weight management goals and the outcome of your clinical assessment.
Several alternatives are available, each with different active ingredients: Wegovy (Semaglutide)- Once-weekly injection
- Supports appetite control through GLP-1
- Average weight loss: 10–15%
- Suitable for long-term use
- Daily injection
- Acts on GLP-1 to reduce appetite
- Average weight loss: up to 10%
- Weekly injection
- Gradually increased to a 3.0mg maintenance dose
- Average weight loss: up to 8% over 56 weeks
- Ongoing review and support from a UK-licensed clinical team
- Online consultations designed to fit around your schedule
- Guidance on nutrition alongside medication use
- Discreet delivery to your home
- Clear pricing with no unexpected costs
- Needles provided at no charge, with sharps bins available if required
Mounjaro was originally developed for adults with type 2 diabetes and may also support weight reduction in eligible patients. Suitability depends on your medical history, current medications, and blood sugar control, as some people may require closer monitoring during treatment.
Some adults may be able to restart Mounjaro after stopping treatment if they still meet prescribing requirements following clinical assessment. Restarting doses often depend on how long treatment has been paused. After a longer break, treatment may need to restart from a lower dose to help reduce the risk of side effects.
Reviewed By: Dr. John Lekkas
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: 20/07/2026Start free Consultation
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