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 Itching: UK Access & Cost Information
Itching is a common side effect reported by some people taking Mounjaro (tirzepatide), though it's not listed as a very common effect in clinical trials. If you're experiencing itching whilst on Mounjaro or considering starting this prescription weight loss injection, you'll want to understand both the side effect itself and how to access Mounjaro in the UK — whether through NHS specialist services or private prescription. This guide covers what causes itching with tirzepatide, when to contact your GP, and the cost and access options available to UK adults.
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.
Understanding Mounjaro Itching and UK Access Routes
Itching (pruritus) can occur with Mounjaro, though it's reported less frequently than nausea or diarrhoea. The itching may be a direct skin reaction at the injection site or, less commonly, a systemic response to the medication itself. If you develop persistent itching, contact your GP or prescriber immediately — they can assess whether it's a sign of an allergic reaction, a localised injection site reaction, or something unrelated to the tirzepatide.
UK access to Mounjaro works through two main routes:
- NHS route: Referral to a tier 3 specialist weight management service, typically after initial assessment by your GP. Availability varies significantly by region and waiting lists can be lengthy.
- Private route: Online consultation with a UK-licensed prescriber, prescription issued if clinically appropriate, dispensed by a GPhC-registered pharmacy. No NHS referral needed. Requires completing a health questionnaire and remote clinical assessment.
Both routes require a clinical assessment to confirm you meet eligibility criteria — typically a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease.
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.
Mounjaro Costs in the UK and Managing Side Effects
Private Mounjaro costs in the UK typically range from £129 to £320 per month depending on the dose and provider, with starting doses (2.5 mg) at the lower end and higher maintenance doses (15 mg) at the premium end. The Mounjaro KwikPen contains four weekly doses, so monthly costs reflect the full month's supply. NHS access is free but subject to regional availability and specialist service waiting times — some areas have significant waiting lists.
If you experience itching whilst on Mounjaro, report it to your prescriber promptly. Minor injection site itching often resolves within hours, but persistent generalised itching may require dose adjustment or, in rare cases, switching to an alternative weight loss medication such as Wegovy (semaglutide), which has a different side effect profile. Your prescriber can assess what's appropriate for your individual situation.
- 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 causes itching when taking Mounjaro?
Itching with Mounjaro may be a localised injection site reaction, a systemic response to tirzepatide, or an allergic response. It's not a very common side effect but some people report it. Rotating injection sites and reporting persistent itching to your GP or prescriber is important, as they can assess whether it's directly related to the medication.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on dose. Starting doses (2.5 mg) cost less; maximum doses (15 mg) cost more. Each KwikPen contains four weekly doses. Costs vary slightly between providers but are broadly similar across GPhC-registered pharmacies.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is approved by NICE for use within NHS specialist weight management services. You'll need a GP referral to a tier 3 or tier 4 weight management service. Access is free on the NHS, but availability and waiting times vary significantly by region and clinical commissioning group (ICB).
What's the difference between accessing Mounjaro on the NHS versus privately?
NHS access requires a GP referral and assessment through a specialist service; it's free but waiting lists vary. Private access involves an online consultation with a UK-licensed prescriber and payment to a pharmacy; it's faster but costs £129–£320 monthly. Both routes require clinical eligibility assessment.
Is Mounjaro the same as tirzepatide?
Yes, Mounjaro is the brand name for tirzepatide. It's a dual GIP and GLP-1 receptor agonist injection licensed in the UK for weight management. Tirzepatide is the active ingredient; Mounjaro is how it's marketed and prescribed. You may hear either term used by healthcare professionals.
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.