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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How to Restart Mounjaro in the UK
If you've previously taken Mounjaro and want to restart treatment, you'll need to understand your access options and costs in the UK. Restarting tirzepatide requires a fresh clinical assessment from a licensed prescriber, whether through NHS specialist services or private online consultation. This guide explains the cost context, eligibility, and practical steps to restart Mounjaro safely in the UK.
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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 Prescription Costs and Access Routes
In the UK, private Mounjaro prescriptions are available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Costs vary depending on your starting dose and the provider, typically ranging from £129 to £320 per month depending on whether you're restarting at a maintenance dose or beginning titration again. A standard Mounjaro KwikPen contains four weekly injections, so monthly costs reflect the dose level prescribed. If you're restarting at a higher dose (such as 10 mg or 15 mg if you previously reached that level), costs will be at the higher end. Some private providers offer discounts for longer-term commitments or multiple pens purchased together.
- Maintenance doses (10–15 mg) typically cost £250–£320/month
- Lower doses (2.5–7.5 mg) typically cost £129–£180/month
- NHS access through specialist weight management services is free but involves significant waiting lists in most regions
- Private prescriptions can be obtained within days of consultation, whereas NHS specialist services may have waiting periods of weeks or 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 and Restarting Your Treatment
When restarting Mounjaro, you have two main routes in the UK. NHS access requires referral to a tier 3 specialist weight management service, where your GP can assess whether restarting is clinically appropriate following your previous treatment pause. Private access skips the referral process — you complete an online consultation with a licensed prescriber, who will review your medical history and previous response to Mounjaro before issuing a new prescription. The clinical assessment is the same standard either way; the main difference is waiting time and cost. Your prescriber will also assess whether you should restart at your previous dose or begin titration from a lower dose (typically 2.5 mg) depending on how long you've been off treatment and any health changes.
Once your prescription is issued, it's dispensed by a GPhC-registered pharmacy and delivered to your home. Before restarting, your prescriber will discuss whether your previous side effect profile or dose tolerance remains relevant. If you previously found a certain dose uncomfortable, they may recommend titrating more gradually this time. You'll also need to confirm your mounjaro kwikpen storage requirements — unopened pens must be refrigerated at 2–8°C, and once opened can be kept at room temperature below 30°C for up to 30 days. Use our free GLP-1 weight loss calculator to project potential outcomes with your planned dose, and track your progress with our progress tracker once you restart.
- 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 restart Mounjaro after stopping treatment?
Yes. If you've previously taken Mounjaro and want to restart, you'll need a new clinical assessment from a licensed prescriber. They'll review your medical history, previous response to tirzepatide, and any health changes since you stopped. Restarting may begin at 2.5 mg again (standard titration) or at a higher maintenance dose if appropriate.
How much does restarting Mounjaro cost on the NHS?
Mounjaro through the NHS is free once prescribed by a specialist weight management service. However, access is through tier 3 services, typically requiring GP referral and specialist assessment. Waiting times vary significantly by region — some areas have waiting lists of months or longer.
What's the typical cost range for private Mounjaro prescriptions in the UK?
Private Mounjaro typically costs £129–£180/month for lower doses (2.5–7.5 mg) and £250–£320/month for maintenance doses (10–15 mg). Costs depend on your prescribed dose and the online provider. A KwikPen contains four weeks' worth of injections.
Do I need to restart at the same dose I was on before?
Not necessarily. Your prescriber will assess whether restarting at your previous dose is safe, or whether beginning titration from 2.5 mg again is more appropriate. This depends on how long you've been off treatment, any health changes, and your previous side effect tolerance.
How long does the online consultation take to get a new prescription?
Online consultations typically take 15–30 minutes. Once completed and approved by the prescriber, prescriptions are usually issued the same day or next working day, with delivery to your home within 2–5 working days depending on the pharmacy.
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.