The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Weight Plateau on Mounjaro: Access and Cost in the UK
If you've reached a weight plateau while taking Mounjaro, understanding your options for dose adjustment and how to access continued treatment is essential. In the UK, Mounjaro (tirzepatide) is available through two main routes: NHS specialist weight management services and private prescription pathways. This guide explains how to access Mounjaro, what it costs, and how your prescriber can help you progress past a plateau through dose titration or other adjustments.
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Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How Much Does Mounjaro Cost in the UK?
Private prescription costs for Mounjaro in the UK typically range from £149 to £299 per month, depending on your dose and the prescribing provider. A single KwikPen (containing four weekly injections) usually costs between £80 and £100 at private providers, meaning a monthly supply costs roughly £320–£400 before any discounts.
The specific cost depends on your maintenance dose: starting doses like 2.5 mg and 5 mg are generally cheaper than higher escalation doses (10 mg, 15 mg). Many private providers offer subscription discounts if you commit to ongoing treatment, which can reduce the per-dose cost by 10–20%.
- Initial consultation fee: typically £50–£150 (one-time)
- Repeat prescription fees: usually £20–£40 per prescription renewal
- Delivery costs: often included or £5–£10 per order
NHS access is free if prescribed through an NHS specialist tier 3 weight management service, but availability varies significantly by region and waiting lists can extend many months.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS vs Private Access: Which Route Is Right for You?
NHS route: Available free through specialist weight management services following GP referral. However, access is patchy — some regions have multi-month waiting lists, others offer faster pathways. Your GP can refer you, but you cannot request Mounjaro directly; the specialist service makes the prescribing decision.
Private route: Faster access — you can typically have your first prescription within 1–2 weeks of online consultation. No GP referral needed. A UK-licensed prescriber assesses your eligibility via online consultation, and if appropriate, issues a prescription to a GPhC-registered pharmacy. This route suits those who cannot access NHS services quickly or prefer privacy. Use our free GLP-1 weight loss calculator to explore projected outcomes at different doses, helping inform discussions with your prescriber about whether dose escalation is appropriate for your weight plateau.
Online consultation process: Register with a provider, complete a health questionnaire, and have a consultation with a licensed UK prescriber (usually within 24–48 hours). The prescriber reviews your medical history, current medications, and weight loss goals. If approved, a prescription is issued and sent to a pharmacy, where your Mounjaro is dispensed and delivered to your address — typically within 2–5 working days.
Important: Prescription weight loss medication requires an active clinical assessment. Prescribers may recommend dose titration (gradual increase) to help you progress past a plateau, typically stepping up every 4 weeks. Track your progress using our free progress tracker to share objective data with your prescriber, supporting discussions about whether escalation is needed.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Can I get Mounjaro free on the NHS?
Yes, if prescribed through an NHS tier 3 specialist weight management service. However, availability varies by region, and waiting lists can be several months. Your GP can refer you, but NHS prescription depends on specialist assessment and regional funding decisions.
How long does a KwikPen last?
Each KwikPen contains four weekly injections, so one pen lasts approximately four weeks. At private providers, a monthly supply (one KwikPen) typically costs £80–£100, though subscription discounts may reduce this.
What happens if I hit a weight plateau on Mounjaro?
Plateaus are common and usually temporary. Your prescriber may recommend dose escalation (moving from 5 mg to 10 mg, for example) following the standard titration schedule. Combined with dietary adjustments and increased activity, escalation often helps you progress past the plateau.
Do I need a GP referral for private Mounjaro?
No. Private prescription requires only an online consultation with a UK-licensed prescriber. Your GP does not need to be involved, though it's good practice to inform your GP you're using prescription weight loss medication.
How do I know if my dose needs adjusting?
After 4 weeks on each dose, your prescriber assesses your weight loss, side effects, and tolerability. If you're not losing weight or side effects are minimal, escalation to the next dose may be recommended. Track your progress weekly to provide your prescriber with clear data.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.