Reviewed By: Dr. John Lekkas
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Last reviewed on: 30/04/2026Shipping 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.
What is Mounjaro treatment?
Mounjaro is a prescription-only treatment for weight loss and type 2 diabetes. It is supplied as a pre-filled injection pen and prescribed under medical guidance. It is suitable for adults with a BMI of 30 or higher, or 27 or higher with weight-related health conditions, where excess weight may affect health.
The medicine contains tirzepatide, which interacts with two key gut hormones (GLP1 and GIP) involved in how the body processes food. These hormones influence hunger, digestion, and how full you feel after eating. By supporting these natural pathways, weight loss injection Mounjaro helps the body respond more effectively to meals.
Its actions include:
- Slowing the rate at which food leaves the stomach
- Enhancing signals that promote fullness
- Supporting insulin response after eating
Together, these effects can help reduce overeating and encourage more controlled portion sizes.
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 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 does Mounjaro work for weight loss?
Mounjaro treatment supports weight management by acting on the body’s appetite control system rather than forcing restriction. Tirzepatide works with two incretin hormones GLP-1 and GIP by acting on the areas of the brain that control hunger.
Its actions include:
- Activating receptors linked to appetite control
- Slowing digestion so fullness lasts longer
- Reducing hunger signals sent to the brain
- Helping smaller meals feel more satisfying
- Supporting insulin release in people with diabetes
These combined actions may make it easier to follow dietary guidance and maintain healthier eating patterns over time.
How effective are Mounjaro injections?
Clinical research shows that Mounjaro shot can support meaningful weight reduction when used as prescribed, although results vary between individuals. In a 72-week clinical study, participants using higher doses experienced greater average weight loss.
Clinical Trial Results Breakdown:
- 15mg dose: average weight loss of 22.5%
- 10mg dose: average weight loss of 21.4%
- 5mg dose: average weight loss of 16%
- Placebo: average weight loss of 2.4%
Disclaimer: Results differ from person to person. Outcomes depend on factors such as starting weight, adherence to lifestyle advice, and overall health.
Some people notice appetite changes within the early weeks, while others experience gradual progress as doses increase. Long-term results are more consistent when treatment is combined with balanced nutrition and regular physical activity.
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.
How to use Mounjaro injection pen?
Mounjaro for weight loss is administered using a pre-filled injection pen with a fine needle designed for ease of use. The pen releases the dose automatically once activated. To administer, hold the pen in place until the dose indicator confirms delivery, then remove the needle gently. No force is required to push the medication in.
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
- Who can not use 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?
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 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.
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 clinical team. Simple dietary adjustments, such as smaller meals, may help ease digestive discomfort. Always refer to the Patient Information Leaflet for full safety details.
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.
When changing injection days, always allow a minimum 72-hour gap before restarting on the new schedule.
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 reduce within days or weeks as the body adjusts. Dose increases may temporarily bring symptoms back.
If side effects continue or worsen, speak with our prescriber so they can review treatment. Current evidence has not confirmed long-term adverse effects directly linked to Mounjaro, but ongoing 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.
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. While they are often compared, they are not identical treatments. Each uses a different active ingredient and follows a distinct treatment pathway, which can influence outcomes, dosing progression, and overall patient experience.
Understanding these differences can help guide a more informed discussion with your prescriber when choosing the most appropriate option.
Note: Clinical data is based on published trial outcomes and product information.
Key differences at a glance
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Average weight reduction (over ~72 weeks) | Up to 22.5% of starting body weight* | Around 15% of starting body weight* |
| Starting price at Mayfair | From £189 | From £139 |
| Active ingredient | Tirzepatide | Semaglutide |
| How it works | Dual-action on GLP-1 and GIP pathways | Single-action on GLP-1 pathway |
| Dose range | 2.5 mg to 15 mg | 0.25 mg to 2.4 mg |
| Pharmaceutical company | Eli Lilly | Novo Nordisk |
How do Mounjaro and Wegovy differ in practice?
While both medications are taken as weekly injections, their treatment experience can differ over time. With a Mounjaro prescription online, treatment typically follows a gradual dose escalation to higher strengths, allowing for more flexible progression based on individual response.
Wegovy also increases step-by-step but within a more limited dosing range. Patients may notice differences in appetite control, tolerance, and overall response during dose adjustments, which can influence the treatment journey.
Which option should you Consider?
There isn’t a single “better” option. The right treatment depends on factors such as your BMI, medical history, existing conditions, and how your body responds during treatment. At Mayfair Weight Loss Clinic, every patient undergoes a structured medical assessment before treatment is prescribed. This ensures that whichever option is chosen is safe, appropriate, and aligned with your long-term weight management plan.
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
- Switch to a lower dose: Moving to a lower Mounjaro dose may still provide benefit while reducing costs.
- Remain on your current dose: If you are already on a lower dose, you may continue without increasing it.
- Consider an alternative treatment: If suitable, Wegovy may be an option. You can begin Wegovy seven days after your final Mounjaro dose, subject to approval.
- Complete the online questionnaire: Share details about your health and weight. Photo uploads may be requested to support the assessment.
- Clinical review: A UK-licensed prescriber evaluates your responses and prescribes Mounjaro if appropriate.
- Select delivery: Medication is delivered discreetly to your home.
- Receive your starter package: You’ll receive guidance to support your diet and activity as you begin treatment.
- Ongoing care: Free follow-up consultations are available through your patient account.
- Diet and calorie balance: Appetite control helps, but weight loss still depends on maintaining a calorie deficit.
- Weight plateaus: Temporary stalls are common as the body adapts.
- Dose progression: As doses increase gradually, a higher dose may be needed for optimal effect.
- Individual response: Mounjaro may not suit everyone. Alternative options can be explored if needed.
- 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
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: 30/04/2026Start free Consultation
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