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 Dry Skin — What You Need to Know
Dry skin is a possible side effect of Mounjaro (tirzepatide), though it's not listed as very common. If you're experiencing dry, itchy, or flaky skin while taking this once-weekly injection, you're not alone — many people report skin changes during weight management treatment. This guide explains what causes it, how to manage it, and when to speak to your GP. We'll also look at how dry skin compares across GLP-1 and dual-action medications used in the UK for weight management.
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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.
What Causes Dry Skin on Mounjaro?
Dry skin during tirzepatide treatment can happen for several reasons. gradual weight management itself can affect skin elasticity and moisture retention as the body changes. Additionally, Mounjaro slows gastric emptying and can reduce appetite significantly, which means some people eat less, drink less fluid, or absorb fewer nutrients — all of which can impact skin hydration and condition.
The medication's mechanism of action as a GIP and GLP-1 receptor agonist may also influence skin health directly, though this is not fully understood. Dehydration is particularly important: when you're losing weight and eating less, it's easy to forget to drink enough water, and dehydrated skin becomes dry and more prone to irritation.
- Weight loss itself can reduce skin moisture
- Reduced food and fluid intake during appetite suppression
- Potential nutrient absorption changes
- Individual sensitivity to the medication
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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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Managing Dry Skin While on Mounjaro
Hydration is essential: drink at least 6–8 glasses of water daily, more if you're exercising or in warm weather. Use a fragrance-free, thick moisturiser immediately after showering while skin is still damp — products containing glycerine, hyaluronic acid, or ceramides work well. Avoid hot showers and harsh soaps, which strip natural oils.
Eat nutrient-dense foods including omega-3 fatty acids (oily fish, flaxseed) and foods rich in vitamins A, C, and E to support skin health. If dry skin persists despite these measures, ask your GP or a dermatologist for recommendations — they may suggest a medical-grade moisturiser or prescribe treatment if skin becomes cracked or infected.
- 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 dry skin a common side effect of Mounjaro?
Dry skin is not listed as a very common side effect in the clinical trial data, though some people do report it. It's more likely related to gradual weight management, reduced fluid intake during appetite suppression, or changes in nutrient absorption rather than tirzepatide itself. Individual experiences vary widely.
How long does dry skin last on Mounjaro?
Dry skin may improve as your body adapts to the medication over several weeks, or it may persist throughout treatment. Consistent skincare and hydration often help significantly. If it doesn't improve after 4–6 weeks of good moisturising habits, discuss it with your GP.
Can I use any moisturiser, or are there specific recommendations?
Fragrance-free, thick creams or ointments work best — avoid lotions which evaporate quickly. Look for ingredients like hyaluronic acid, glycerine, ceramides, or lanolin. Dermatologists often recommend brands suited to sensitive or very dry skin. Your GP can advise if over-the-counter products aren't helping.
Is dry skin on Mounjaro worse than on Wegovy?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide, a GLP-1-only medication) can cause skin changes during weight loss. Clinical trial data doesn't show dry skin as significantly more common on one versus the other. Individual factors like hydration, genetics, and climate matter more than the medication type.
When should I contact my GP about dry skin?
Contact your GP if dry skin becomes severe, cracks open, shows signs of infection, prevents you from continuing treatment, or doesn't improve after consistent moisturising for 3–4 weeks. Your GP can rule out other causes and suggest prescription-strength treatments if needed.
Ready to take control of your weight loss journey?
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