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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Staying On 2.5mg Mounjaro: Access and Cost in the UK
Many people starting Mounjaro in the UK wonder whether they can remain on the 2.5mg initial dose rather than escalating to higher doses. The answer depends on your response to treatment, your prescriber's assessment, and how you access the medication — whether through NHS specialist services or private online prescription. Understanding both the cost and access routes will help you make an informed decision about your weight management journey.
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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.
UK Private Costs for Staying on 2.5mg Mounjaro
If you access Mounjaro privately through a UK online prescriber, the 2.5mg dose typically costs between £129 and £180 per month, depending on the provider and whether you're buying a single pen or a monthly subscription. Each Mounjaro KwikPen contains 4 doses (4 weeks of supply), so costs are usually quoted per pen. Staying on 2.5mg means you'll use one pen every 4 weeks, making this the most affordable ongoing dose of tirzepatide available privately.
- Single pen purchases: typically £129–£160
- Monthly subscription (auto-delivery): often £140–£180 with potential discounts
- No additional consultation fees once prescribed (initial assessment may cost £20–£50)
- Prescription valid for 6–12 months depending on provider
Costs can vary between providers, so comparing quotes is worthwhile. Some private prescribers offer loyalty discounts or package deals if you commit to longer-term treatment. It's also worth checking whether your private prescription can be dispensed at a local pharmacy, which may offer competitive pricing.
Clinically BackedWeight Loss
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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 Access and Private Prescription Routes
NHS route: Accessing Mounjaro through the NHS means you will not pay the full private cost. However, NHS availability is limited to tier 3 specialist weight management services, and you must be referred by your GP. Waiting lists vary dramatically by region — some areas have waits of several months or longer. If approved through the NHS, your cost is covered, but dose escalation is typically expected as part of the standard treatment protocol.
Private prescription route: You can access a 2.5mg prescription without NHS referral through a GPhC-registered online prescriber following an online clinical assessment. This route offers faster access and the flexibility to stay on 2.5mg if it's working for you. You'll need a valid UK prescription and can use our GLP-1 weight loss calculator to understand potential outcomes at this dose based on clinical trial data.
Can you stay on 2.5mg long-term? Yes — if your prescriber assesses that the 2.5mg dose is meeting your weight management goals and you're tolerating it well, you can continue this dose. However, clinical practice typically involves dose titration (gradual increases) to find your optimal dose. Staying on 2.5mg is possible but less common, as many people benefit from escalating to 5mg or higher. Your prescriber will review your progress regularly and discuss whether escalation or continuation is right for you. Track your progress using our free progress tracker to help inform these conversations with your prescriber.
- 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.
Is 2.5mg Mounjaro enough for weight loss?
Clinical trials show that 2.5mg produces modest weight loss compared to higher doses. Average weight loss at 2.5mg is lower than at 5mg, 10mg, or 15mg, but individual responses vary. Some people see significant benefit at lower doses; others benefit from escalation. Your prescriber will assess whether 2.5mg is meeting your goals.
How much does a month's supply of 2.5mg Mounjaro cost privately in the UK?
One Mounjaro KwikPen (4 doses, 4 weeks supply) typically costs £129–£180 privately, depending on your provider. Monthly subscription options may offer slightly better value. Prices vary between different online prescribers, so comparing is worthwhile.
Can I get Mounjaro on the NHS at 2.5mg?
Mounjaro is available on the NHS through specialist tier 3 weight management services via GP referral. However, NHS access is limited and waiting lists are long in many areas. Availability and dosing protocols vary by region. Your GP can advise on NHS eligibility and local waiting times.
What's the difference between staying on 2.5mg versus escalating?
Staying on 2.5mg is the lowest dose and typically produces modest weight loss. Escalating to 5mg or higher produces greater average weight loss in clinical trials. Your prescriber may recommend escalation if 2.5mg isn't meeting your goals, but you can discuss remaining at 2.5mg if it's working for you and you're tolerating it well.
How do I access a 2.5mg Mounjaro prescription without NHS referral?
You can book a consultation with a UK-licensed prescriber through a GPhC-registered online pharmacy. You'll complete an online health assessment, and if suitable, receive a prescription for 2.5mg. This route doesn't require NHS referral and typically takes days rather than months to access. ```
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.