Struggling to work out if you qualify for Mounjaro treatment in the UK? With strict BMI thresholds and health condition requirements, it's easy to feel confused about NHS versus private options. This article breaks down each eligibility criteria, contraindication, and step-by-step check process. Phlo Clinic has supported over 90,000 members to access treatments like Mounjaro, delivering up to 20% weight loss.
If you’ve been following weight loss news in the UK recently, you’ve almost certainly heard about Mounjaro. It’s widely discussed for good reason but accessing it isn't as simple as just asking for a prescription.
Whether you choose the NHS or a private provider like Phlo Clinic, strict eligibility criteria set by the Medicines and Healthcare products Regulatory Agency (MHRA) are in place to help make sure these medications are prescribed responsibly, safely, and to the patients who genuinely need them.
These criteria are quite specific. It’s not just about wanting to lose a few pounds for a holiday; it’s about treating obesity as a medical condition. Understanding where you stand with your Body Mass Index (BMI) and medical history is the first step. This guide breaks down exactly who qualifies for treatment right now and how the process works.
What is Mounjaro and How Does It Work?
Mounjaro (active ingredient tirzepatide) is a weekly injectable medication that has shifted how we approach weight management. Unlike earlier treatments that target a single hormone, Mounjaro is a "dual agonist." It mimics two hormones naturally found in the body: GLP-1 and GIP.
Here is what that actually means for you:
- Appetite Suppression: It signals to your brain that you are full, reducing hunger.
- "Food Noise" Reduction: It quietens intrusive thoughts about food and cravings.
- Blood Sugar Control: It helps regulate how your body processes glucose.
The results are significant. Clinical trials have shown that patients can lose up to 20% of their body weight over a 72-week period when combined with diet and exercise (NEJM). It comes in an easy-to-use KwikPen, making it relatively simple to self-administer at home.
Core Eligibility Criteria for Mounjaro Treatment
To start Mounjaro privately in the UK, you must meet specific medical standards. These rules are designed to ensure the benefits outweigh the risks for your specific medical history and health needs. Generally, prescribers look at three main pillars: your weight relative to your height (BMI), your age, and your overall health status.
BMI Thresholds
The most critical factor is your Body Mass Index (BMI). Private pharmacy providers should always follow the licensed indications for the medication.
You typically need to fall into one of these categories:
- BMI of 30 or above: This is classified as obesity. If your BMI is here, you usually qualify based on weight alone.
- BMI of 27 to 30: This is classified as overweight. You can qualify in this range only if you also have a weight-related health condition (see below).
- BMI of 23+ (Switching): If you are already on a GLP-1 medication and want to switch to Phlo Clinic, you may be accepted with a BMI of 23 or above, if you provide sufficient evidence of your previous treatment.
Individuals from Black, Asian, and minority ethnic (BAME) backgrounds have an increased risk of weight-related health conditions at lower BMI values. Therefore, lower BMI thresholds apply, representing a reduction of 2.5 BMI points for eligibility.
For patients from BAME backgrounds, the following lower BMI thresholds apply for eligibility for Mounjaro:
- BMI 27.5 kg/m² or above – This is classified as obesity. If your BMI is here, you usually qualify based on weight alone.
BMI 24.5 to 27 kg/m² – This is classified as overweight. You can qualify in this range only if you also have a weight-related health condition (see below).
Weight-Related Health Conditions
If your BMI is between 27 and 30, weight alone isn't enough to qualify. You must have at least one diagnosed weight-related accompanying condition, often called a "comorbidity." This requirement ensures that the medication is being used to improve health outcomes, not just for cosmetic weight loss.
Age and Other Basic Requirements
Beyond weight, there are hard limits on who can safely start treatment.
- Age: You must be aged between 18 and 85.
- Residency: You need to be a resident in the UK.
- Diabetic Status: You do not have diabetes (or pre-diabetes requiring treatment)
NHS vs Private Sector Eligibility Differences
It is crucial to understand that qualifying for Mounjaro privately is very different from qualifying on the NHS. While private clinics follow the standard medical license (BMI 30+ or 27+ with risk factors), the NHS is rolling out access in strict phases due to high demand and budget constraints.
As of early 2026, the NHS is using a "cohort" system. You might be eligible privately but still years away from NHS eligibility.
Cohort 1
Start date: June 2025
BMI requirement: 40+ (37.5 for minority ethnic backgrounds)
Health conditions required: At least 4 specific conditions (e.g., hypertension, CVD)
If you do not meet these strict NHS criteria, a private service is likely your only route to access treatment currently.
Key Medical Contraindications and Exclusions
Even if you meet the BMI and age criteria, certain medical history factors will disqualify you immediately. These exclusions exist to prevent serious side effects.
You generally cannot take Mounjaro if you:
- Are pregnant or breastfeeding.
- Have a personal or family history of medullary thyroid carcinoma (a type of thyroid cancer).
- Have Multiple Endocrine Neoplasia syndrome type 2 (MEN 2).
- Have a history of pancreatitis.
- Have a history of severe gastroparesis (stomach paralysis).
- Have an active eating disorder or a history of one.
Additionally, when it comes to Mounjaro and contraception, you should be aware that Mounjaro may reduce the effectiveness of oral contraceptives, meaning extra precautions may be advised.
Step-by-Step Process to Check and Confirm Eligibility
Knowing the criteria is one thing, but getting approved is a structured process. At Phlo Clinic, we have streamlined this, but we still carry out rigorous checks.. You can't just click "buy" and expect a delivery; it’s a prescription medication that requires clinical oversight.
Here is how the process works in practice.
1. Self-Assessment Questionnaire
The first step is completing an online consultation. You will fill out a questionnaire that takes about 3 minutes. You'll need to answer questions about:
- Your current weight and height.
- Your medical history and current medications.
- Your GP's details (for safety records).I
t’s important to be honest here. Our clinical team relies on this data to keep you safe.
2. Clinical Review and Consultation
Once you submit your answers, one of our prescribing pharmacists reviews them individually. This isn't an automated "yes/no" from a computer or AI; a human clinician assesses your suitability. We pride ourselves on this as safety is paramount to us.
Important requirement: You will need to upload photographic evidence.
- This verifies your identity.
- It confirms your weight/body composition matches your stated BMI.
This is a mandatory step to verify your consultation.
3. Prescription Approval and Next Steps
If the clinical team approves your application, a prescription is issued.
- You will receive confirmation via email.
- Your medication is dispensed.
- Delivery is arranged (always temperature-controlled and via Royal Mail Tracked 24).
- Your GP is notified of your treatment.
If you are rejected, the clinical team will explain why, usually due to a contraindication or a BMI that is too low for safe treatment.
Best Practices for Preparing to Start Mounjaro
Getting approved is just the start. To get the best results, and the 20% weight loss seen in studies, you need to be willing to also combine your Mounjaro treatment with a healthy diet, resistance exercise and healthy lifestyle choices. Mounjaro is a tool, not a magic wand.
- Plan your meals: You will feel less hungry, so focus on nutrient-dense foods (high in protein and fibre) rather than empty calories.
- Hydrate: Dehydration can be a common side effect. Drink plenty of water, around 2-3L per day.
- Schedule your dose: Pick a day of the week and time that works for you. Many people choose Friday or the weekend in case they experience mild fatigue initially.
- Read the Patient Information Leaflet: Familiarise yourself with how to use the Mounjaro KwikPen before you try to inject it.
Common Mistakes That Could Delay Your Treatment
The approval process is fast, but simple errors can cause frustrating delays.
Avoid these common pitfalls:
- Bad Photos: Uploading blurry photos, photos where you are fully dressed in baggy clothes, or photos that don't show your full body can lead to a request for new images.
- Guessing Your Weight: Don't guess. Weigh yourself the morning you apply. Discrepancies between your stated weight and your photo evidence could cause delays or even rejection.
- Incomplete GP Info: Prescribers often need to notify your GP. If you don't have these details handy, it can stall your application.
- Ignoring Medical History: Leaving out details about medication you take for other conditions (like diabetes or thyroid issues) will pause the process while the pharmacist contacts you for clarification.
Starting Mounjaro with Phlo Clinic
If you are ready to start, Phlo Clinic offers a streamlined, supportive service for UK patients. The service is designed to be more than just a transaction; it includes ongoing clinical support to help you manage your journey.
Why choose Phlo Clinic?
- Competitive Pricing: Starter doses (2.5mg) begin at £149 for a 4-week supply.
- Bundles: You can save money by purchasing 8-week bundles (e.g., 2 x 2.5mg for £305).
- Clinical Support: Access to UK-based clinicians and monthly check-ins.
- Reliable Stock: Manufacturer-sourced medication delivered via free Royal Mail Tracked 24.
Phlo also offers a price match scheme on GLP-1 medications, ensuring you don't have to choose between cost and quality care.
Eligibility for Mounjaro in the UK is strictly regulated to ensure patient safety. While the NHS rollout is slow and limited to those with the most severe health needs, private access through providers like Phlo Clinic is available for a wider group of people with a BMI of 30+ (or 27+ with conditions).
If you meet the criteria, and do not have any exclusions, Mounjaro can be a powerful option for long-term weight management. The key is to approach it as a medical treatment, be honest during your consultation, and utilize the clinical support available to you.
Check your eligibility now to see if Mounjaro is the right step for your health journey.
Frequently Asked Questions
How long does Mounjaro approval take after submitting photos and questionnaire?
Approval typically takes 24-48 hours (excluding weekends and bank holidays) after clinical review of your questionnaire and photo evidence. Phlo Clinic notifies you via email if approved, with medication dispatched same-day via Royal Mail Tracked 24.
Can you get Mounjaro on the NHS if you don't meet private BMI criteria?
No, NHS eligibility starts at BMI 40+ (or 37.5+ for minority ethnic groups) with at least 4 conditions in Cohort 1 from June 2025. Private options allow BMI 30+ or 27+ with comorbidities, offering faster access.
What side effects should you expect when starting Mounjaro?
Common side effects include nausea, diarrhoea, and fatigue, especially in the first 4 weeks at 2.5mg dose. These are often very manageable and improve over time; stay hydrated and eat small, protein-rich meals to manage them effectively.
How do you calculate BMI to check Mounjaro eligibility?
BMI is weight in kg divided by height in meters squared (e.g., 90kg / 1.7m² = 31.1). Use an online calculator with morning weigh-in for accuracy; private providers require BMI 30+ or 27+ with conditions.
Can you drink alcohol while on Mounjaro treatment?
Yes, in moderation, as Mounjaro doesn't directly interact with alcohol. Limit to 1-2 units weekly to avoid worsening nausea or dehydration; consult your clinician if you have liver conditions.
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