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- 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 5mg Reviews — UK Cost, Access & What to Expect
Mounjaro 5mg is the first maintenance dose most people reach after starting tirzepatide treatment. This guide covers real user experiences with this dose, UK pricing across NHS and private routes, and how to access Mounjaro through online prescription services. We'll explain the 5mg dose specifically, how it compares to other strengths, and what you need to know about costs and eligibility in the UK healthcare system.
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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.
Mounjaro 5mg Cost & Private Access in the UK
Private prescription cost: Mounjaro 5mg typically costs between £129 and £200 per month through UK-registered online prescription services, depending on the provider. Each KwikPen contains four weekly injections, so one pen supplies a month's treatment. Costs may vary based on consultation fees and whether you're a new or returning patient.
- Starting dose is 2.5mg (weeks 1–4), then escalated to 5mg (weeks 5–8+)
- 5mg is usually the first maintenance dose for many patients
- Private prescriptions require an online clinical assessment by a UK-licensed prescriber
- Payment is typically required upfront before the prescription is dispensed
- Your GP can provide a private prescription if you prefer to use a local pharmacy
Always check that the pharmacy you're using is GPhC-registered — this ensures the service meets UK pharmacy standards and your data is protected. Compare costs across providers, as prices and consultation fees vary.
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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 vs Private Routes — How to Access Mounjaro 5mg
NHS access: Mounjaro was approved by NICE for specialist weight management services. Access is through referral to a tier 3 or tier 4 specialist weight management service, not standard GP prescription. Waiting lists vary significantly by region (ICB) — some areas have waits of several months or longer.
Private access: Available without NHS referral through an online consultation with a UK-licensed prescriber. The process typically takes 24–48 hours from consultation to dispensing. You'll answer health questions online, have your eligibility assessed, and receive a prescription to a GPhC-registered pharmacy if approved. Use our GLP-1 weight loss calculator above to explore potential outcomes at 5mg dose, and our BMI calculator to check your starting point.
Both routes require clinical assessment — you cannot buy Mounjaro without a valid UK prescription. If you're considering private access, expect the consultation to cover your medical history, current medications, weight loss goals, and any contraindications. The 5mg dose is where most people stabilise, though some progress to higher strengths (7.5mg, 10mg, 15mg) depending on response and tolerance.
- 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.
What do users say about Mounjaro 5mg reviews and side effects?
Common feedback from 5mg users includes reduced appetite, nausea (usually mild by this dose), and steadier energy levels compared to the starting dose. Most users report that side effects improve after 2–4 weeks on 5mg. Individual experiences vary — some feel ready to escalate to 7.5mg, others find 5mg is their effective maintenance dose. Always discuss your experience with your prescriber.
Is Mounjaro 5mg cheaper on the NHS or private?
NHS access is free at point of use but involves waiting lists and regional variation. Private costs typically range from £129–£200 monthly. If you can access NHS specialist services quickly, this is more economical long-term. Private access offers faster prescribing but at a cost. Consider both wait times and affordability in your decision.
How long does it take to get Mounjaro 5mg through private prescription?
Most private online consultations are assessed within 24–48 hours. If approved, your prescription is sent directly to a GPhC-registered pharmacy and dispatched within 2–5 working days. NHS referral routes typically involve longer waits — check your local ICB for current timescales. Starting treatment can happen quickly via private routes if you meet clinical criteria.
What is the clinical evidence for Mounjaro 5mg effectiveness?
In the SURMOUNT-1 trial, the 5mg dose contributed to an average weight loss of around 15% body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity. Results vary significantly between individuals. Your personal response depends on adherence to lifestyle changes, genetics, and how your body responds to tirzepatide.
Can I switch from Mounjaro 5mg to Wegovy?
Switching between medications requires prescriber guidance. Mounjaro 5mg and Wegovy 0.5mg are approximate equivalents, but there's no official conversion chart. If you experience side effects on 5mg Mounjaro or want to explore alternatives, discuss this with your prescriber — they can assess whether switching is appropriate and manage the transition safely.
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.