The UK's most complete GLP-1 guide
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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: What UK Adults Need to Know
Mounjaro 5mg is the first maintenance dose of tirzepatide prescribed in the UK following the 2.5mg starting phase. If you're considering this prescription-only weight management injection, this guide covers real-world experience from UK perspectives, NHS eligibility, clinical evidence, and what the 5mg dose typically means for weight loss. We'll explore NICE guidance, how this dose compares to alternatives like Wegovy, and what you can realistically expect based on UK prescribing context and clinical trial data.
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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.
Mounjaro 5mg in UK Practice: NHS Access and Clinical Context
Mounjaro 5mg is typically reached around week 5 of treatment, after starting at 2.5mg for weeks 1–4. This dose represents the first maintenance tier, though many people escalate further to 7.5mg, 10mg or higher over subsequent weeks. In clinical trials (SURMOUNT-1), people reaching 5mg showed average weight loss of approximately 15% body weight over 72 weeks when combined with reduced-calorie diet and increased physical activity — though individual results vary significantly.
NHS prescribing eligibility requires either a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions like type 2 diabetes or cardiovascular disease. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds (from 27.5+). Access is through tier 3 specialist weight management services, not standard GP prescription. NICE has approved tirzepatide for NHS use, but availability and waiting lists vary significantly by region and integrated care board (ICB).
Use our free GLP-1 weight loss calculator to estimate potential outcomes at the 5mg dose, or our BMI calculator to confirm your eligibility for NHS assessment.
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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.
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5mg Mounjaro Reviews: NHS vs Private Route and Real Experience
People in the UK access Mounjaro 5mg through two main routes: NHS tier 3 specialist services (free but with waiting lists of weeks to months in many areas) or private prescription through registered online pharmacies (faster access, typically £150–£200+ per month depending on dose). Reviews from UK users on the 5mg dose commonly mention mild-to-moderate nausea in the first 1–2 weeks at this dose level, which often improves with time. Constipation and reduced appetite are frequently reported as the dose increases from the 2.5mg starting point.
Compared to Wegovy (semaglutide), the 5mg Mounjaro dose is roughly equivalent to the 1.7mg Wegovy dose in terms of effect, though tirzepatide's dual GIP+GLP-1 mechanism may produce slightly different hunger and satiety patterns. Most UK prescribers will discuss escalation plans — many people move beyond 5mg after 4–8 weeks if tolerated well. Track your weight and side effects using our free progress tracker to support discussions with your prescriber about dose adjustments.
- 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 Mounjaro 5mg available on the NHS in the UK?
Yes, tirzepatide (Mounjaro) is approved by NICE for NHS use in specialist tier 3 weight management services. However, access requires referral from your GP and assessment by a specialist team. Availability and waiting times vary by region and integrated care board (ICB). Private prescription is faster but not free.
What weight loss should I expect on Mounjaro 5mg?
Clinical trial data (SURMOUNT-1) showed average weight loss of approximately 15% body weight over 72 weeks at the 5mg dose, alongside diet and exercise changes. Individual results vary considerably. Some people lose more, some less. Your prescriber or our GLP-1 calculator can give you a personalised estimate.
How does Mounjaro 5mg compare to Wegovy?
The 5mg Mounjaro dose is approximately equivalent to Wegovy 1.7mg in effect. Mounjaro uses a dual GIP+GLP-1 mechanism versus Wegovy's GLP-1 only. Clinical data suggests both are effective; the choice depends on personal response, NHS vs private access, and prescriber recommendation.
What are common side effects at the 5mg Mounjaro dose?
Nausea, constipation, diarrhoea, and reduced appetite are reported in clinical trials. Nausea often improves after 1–2 weeks at each dose level. Serious side effects are rare. Always report persistent symptoms to your prescriber — dose adjustments or timing changes may help.
How long do you stay on Mounjaro 5mg before increasing?
Most prescribers recommend staying on each dose for at least 4 weeks to assess tolerance and effect. After 4 weeks at 5mg, your prescriber will discuss whether to escalate to 7.5mg or continue. This depends on your side effects, weight loss progress, and individual response.
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.