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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Mounjaro and Sensitive Skin: UK Access and Cost Guide
If you have sensitive skin, you may be concerned about using Mounjaro (tirzepatide), the prescription weight management injection. Injection site reactions like redness, itching, and bruising are common with any injectable medication. This guide explains what injection site sensitivity means, how to manage it, the cost of accessing Mounjaro in the UK through NHS and private routes, and what to expect during online consultations. Use our GLP-1 weight loss calculator to explore how Mounjaro might support your weight management goals, and speak with your GP or prescriber about whether this medication suits your individual skin health.
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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 Sensitive Skin Reactions and Managing Them
Injection site reactions are among the most common side effects reported with Mounjaro (tirzepatide). These typically include redness, bruising, pain, swelling, or itching at the injection site and usually resolve within a few days without treatment.
If you have sensitive or reactive skin, or a history of contact dermatitis, inform your prescriber before starting Mounjaro. Managing injection site sensitivity involves:
- Rotating injection sites each week between stomach, thigh, and upper arm to avoid repeated trauma to the same area
- Allowing the injection pen to reach room temperature before use — injecting cold medication can increase discomfort
- Cleaning the skin with soap and water (not alcohol) before injection to minimise irritation
- Avoiding tight clothing over the injection site for several hours after dosing
- Using fragrance-free moisturisers if skin becomes irritated
Most injection site reactions are mild and temporary. However, if you experience severe swelling, signs of infection, or persistent reactions lasting more than a week, contact your GP or prescriber immediately.
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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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Mounjaro Cost and Access in the UK: NHS vs Private
NHS access: Mounjaro is available through NHS specialist tier 3/4 weight management services if you meet eligibility criteria (BMI ≥30, or BMI 27–29.9 with weight-related health conditions). However, NHS availability is extremely limited, and waiting lists in many regions are months to years. Your GP can refer you, but access depends on your local integrated care board (ICB) funding.
Private prescription: You can access Mounjaro privately through a UK-licensed online prescriber without NHS referral. Costs typically range from £129–£280 per month depending on dose. You'll complete an online health questionnaire, have a consultation with a prescriber, and if approved, receive your prescription dispensed by a GPhC-registered pharmacy. The entire process usually takes 1–3 working days. Use our BMI calculator to check your eligibility before consulting a prescriber.
- 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 use Mounjaro if I have very sensitive skin?
Most people with sensitive skin can use Mounjaro, but inform your prescriber beforehand. Injection site reactions are common but usually mild and temporary. Your prescriber may suggest strategies to minimise irritation, such as rotating injection sites and allowing the pen to reach room temperature. If you have severe skin conditions or allergies to tirzepatide or pen components, discuss this with your prescriber during consultation.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129–£280 per month depending on your dose (2.5 mg to 15 mg weekly). Some online prescribers offer tiered pricing or bundle discounts. Prices may vary between providers. The medication is dispensed by a GPhC-registered pharmacy following your prescription. Always check current pricing with the provider before starting treatment.
How do I access Mounjaro through the NHS in the UK?
NHS access is through specialist tier 3/4 weight management services. You need a GP referral and must meet eligibility criteria (BMI ≥30, or ≥27.5 with weight-related health conditions). However, NHS availability is very limited and varies by region. Waiting times can be substantial. Your GP can discuss whether you meet local criteria and what waiting times to expect.
What happens during an online Mounjaro consultation with a private prescriber?
You'll complete a detailed health questionnaire covering medical history, current medications, allergies, and weight management goals. A UK-licensed prescriber reviews this and may request blood pressure or other information. If approved, they issue a prescription dispensed by a registered pharmacy. The process is usually confidential, conducted entirely online, and takes 1–3 working days from start to prescription.
What's the difference between Mounjaro and Wegovy for sensitive skin?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) can cause injection site reactions, though incidence varies individually. Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is GLP-1 only. Both are prescription-only and require clinical assessment. Neither is inherently better for sensitive skin — discuss your specific skin concerns with your prescriber, who can help you choose and manage whichever medication suits you best.
Ready to take control of your weight loss journey?
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