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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Mounjaro Without Subscription — How to Access It in the UK
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescribing routes — and you don't need a subscription to access it. Many people assume weight loss injections require ongoing subscription payments, but the actual cost structure is different. This guide explains how to get Mounjaro in the UK, what you'll pay, and the differences between NHS and private access options.
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Calculate Your BMI Instantly
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.
Private Mounjaro Access and Pricing in the UK
Private prescription costs for Mounjaro in the UK typically range from £120 to £320 per month, depending on your dose and the prescribing provider. These are one-off prescription fees per order — not subscription commitments. When you order, you pay for a single KwikPen (four weeks' supply at your current dose), and you can choose whether to reorder or stop at any point.
- Doses 2.5–7.5 mg: approximately £120–£180 per month
- Doses 10–12.5 mg: approximately £180–£250 per month
- Dose 15 mg (maximum): approximately £250–£320 per month
These costs are for private online prescribing only. You'll need a valid UK prescription from a licensed prescriber and dispensing through a GPhC-registered pharmacy. The dose you're on significantly affects cost — as you titrate (gradually increase your dose), your monthly cost will rise. Many private providers offer dose escalation packs that bundle the starting dose with planned increases, but these are optional bundles, not mandatory subscriptions.
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 Routes — Access and What to Expect
The NHS route is free at point of use if approved, but access is through specialist tier 3 weight management services — not your GP. You'll typically need a referral and may face waiting lists of several months to over a year in many areas, depending on your ICB (Integrated Care Board) region. NHS availability for tirzepatide (Mounjaro) varies significantly across the UK.
The private route is faster: online consultation with a UK-licensed prescriber, clinical assessment, and prescription issued within days if suitable. You choose your provider and can stop at any time. To get private Mounjaro, you'll complete an online health questionnaire, discuss your weight loss goals with a prescriber, and provide medical history. If approved, your prescription goes directly to a pharmacy for dispensing. Use our free GLP-1 weight loss calculator to estimate potential weight loss at different doses before deciding on your approach.
- 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.
Do I need a subscription to get Mounjaro in the UK?
No. Both NHS and private access are non-subscription models. With private prescribing, you pay per order (per KwikPen). You can reorder or stop at any time without penalty. Some private providers offer optional bundled packages for dose escalation, but these are not mandatory subscriptions — standard single-dose ordering is available.
What's the actual cost of Mounjaro on the NHS?
Mounjaro is free on the NHS if you're eligible and your specialist service approves it. However, NHS access is limited to specialist tier 3 weight management services and availability varies greatly by region. Waiting times can be considerable, and access is not assured for all patients who meet eligibility criteria.
Can I switch between NHS and private Mounjaro?
Yes, but you cannot use both simultaneously. If you start on NHS Mounjaro and later want to switch to private prescribing (or vice versa), you'll need to manage the transition with your prescriber. Switching typically involves a brief gap between doses while your new prescription is arranged.
What happens if I can't afford to continue private Mounjaro?
You can stop at any time without penalty or subscription cancellation fees. However, stopping and restarting medication should be discussed with your prescriber, as abruptly stopping can affect weight maintenance and you may experience rebound weight gain. Your GP or private prescriber can advise on the best approach.
Is Mounjaro cost different from Wegovy or Saxenda in the UK?
Yes. Mounjaro (tirzepatide) is typically priced comparably to Wegovy (semaglutide) but with different dose structures — Mounjaro starts at 2.5 mg and goes to 15 mg weekly, while Wegovy ranges from 0.25 mg to 2.4 mg. Saxenda (liraglutide) is a daily injection, not weekly, and pricing differs accordingly. Your prescriber will discuss which option is appropriate for you.
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.