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
Free tracker included with every download this week
Mounjaro Body Aches — UK Access and Cost Guide
Body aches are a possible side effect some people experience when taking Mounjaro (tirzepatide), though they are not listed as very common. If you are considering Mounjaro for weight management in the UK, understanding both the cost and how to access the medication is equally important as knowing potential side effects. This guide explains the cost of Mounjaro in the UK, the difference between NHS and private access routes, and what to expect when seeking a prescription through an online clinical assessment. Our GLP-1 weight loss calculator can help you explore potential outcomes at different doses, whilst our BMI calculator shows whether you meet eligibility criteria for this prescription medication.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Mounjaro Cost and Private Prescription Access in the UK
In the UK, Mounjaro is available through private prescription routes without requiring an NHS referral. Private costs typically range from £129 to £320 per month, depending on the dose you are prescribed and the provider. Starting doses (2.5 mg) are usually at the lower end of this range, whilst higher maintenance doses (10 mg to 15 mg) cost more. Each KwikPen contains four weekly doses, so monthly costs reflect the specific strength prescribed.
Costs may vary between GPhC-registered online prescribing services, so comparing providers is worthwhile. When budgeting, remember that Mounjaro requires ongoing prescription refills — this is not a one-time cost. Some people remain on lower doses long-term, whilst others titrate upwards over several weeks as their body adjusts. Dose titration affects total cost: you may start at 2.5 mg for four weeks before escalating, meaning your first month costs less than later months when you reach a higher maintenance dose.
- Starting dose (2.5 mg): approximately £129–£180 per month
- Mid-range doses (5–7.5 mg): approximately £180–£240 per month
- Higher doses (10–15 mg): approximately £240–£320 per month
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 access to Mounjaro (tirzepatide) is available through NICE-approved tier 3 specialist weight management services, but this route has significant limitations. You must be referred by your GP, waitlists can be many months or even years in some regions, and availability varies widely by integrated care board (ICB). If you do access Mounjaro via the NHS, there is no direct cost at the point of prescription.
Private access is faster and available without NHS referral. You complete an online clinical assessment with a UK-licensed prescriber, and if appropriate, receive a prescription to be dispensed by a GPhC-registered pharmacy. This typically takes days rather than months. The trade-off is that you pay the private cost yourself — no NHS subsidy. For people with body aches or other side effects, both routes offer the same medication; the difference is speed, availability, and cost. Your GP can advise whether NHS access is realistic for you.
- 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.
How much does Mounjaro cost per month in the UK privately?
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your prescribed dose. Starting doses (2.5 mg) are around £129–£180, whilst higher maintenance doses (10–15 mg) cost £240–£320. Prices may vary between GPhC-registered providers, so it is worth comparing options before committing.
Is Mounjaro available on the NHS in the UK?
Yes, Mounjaro is available through NICE-approved NHS tier 3 specialist weight management services. However, you must be referred by your GP, and waitlists can be very long — sometimes months or years. Availability also varies significantly by your local integrated care board (ICB). Private access is typically much faster.
What is the online prescription process for Mounjaro in the UK?
You complete an online consultation with a UK-licensed prescriber, answering questions about your health and eligibility. If the prescriber assesses that Mounjaro is appropriate for you, a prescription is issued and sent to a GPhC-registered pharmacy for dispensing. The entire process usually takes 1–5 days.
Can I switch from Wegovy to Mounjaro if I experience body aches?
Switching between medications must be managed by your prescriber — never stop and start medications without clinical guidance. If body aches occur on any GLP-1 medication, discuss this with your prescriber. They can advise whether continuing at the same dose, dose reduction, or switching to a different medication is appropriate.
How is Mounjaro prescribed — do I need a repeat prescription?
Mounjaro requires a new prescription each month because it is a controlled prescription-only medicine. Once your dose is established and your prescriber confirms it is stable, repeat prescriptions are typically straightforward to obtain through your chosen provider. Plan ahead for refills to avoid gaps in treatment.
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.