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
Does Mounjaro Make You Sweat?
Sweating is not listed as a common or very common side effect of Mounjaro (tirzepatide) in UK clinical data, though some individuals do report increased perspiration during treatment. Mounjaro is a prescription-only GLP-1 and GIP receptor agonist injection used for weight management in UK adults. While nausea, diarrhoea, and appetite changes are the most frequently reported side effects, individual responses vary considerably. If you're considering Mounjaro as part of your weight management journey, understanding all potential side effects—including less common ones—helps you make an informed decision with your prescriber.
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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 Side Effects and Sweating — What the Evidence Shows
Sweating is not listed among very common or common side effects in the SURMOUNT clinical trials or UK prescribing information for Mounjaro. However, some patients on GLP-1 and GIP receptor agonists do report increased perspiration, particularly during the first few weeks of treatment or when doses are increased.
Why might this happen? Possible reasons include:
- Metabolic changes — as your body adapts to the medication and shifts how it uses energy
- Nausea and discomfort — physical stress can trigger sweating as a symptom
- Individual variation — some people are naturally more sensitive to medication effects
- Dose escalation — sweating may be more noticeable when increasing from one dose to the next (dose titration)
If you do experience excessive sweating on Mounjaro, this typically improves as your body adjusts. Always mention any concerning side effects to your prescriber during your follow-up appointments.
Clinically BackedWeight Loss
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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.
Accessing Mounjaro in the UK — NHS vs Private Cost and Routes
In the UK, Mounjaro is available through two main routes: NHS specialist services or private prescribing via online consultation.
NHS route: Referral to a tier 3 specialist weight management service through your GP. NICE has approved tirzepatide for NHS use, though availability and waiting times vary significantly by region and integrated care board (ICB).
Private route: Online consultation with a UK-licensed prescriber, followed by prescription dispensing through a GPhC-registered pharmacy. This route offers faster access without NHS waiting lists. Costs typically range from £150–£320 monthly depending on your dose.
Use our GLP-1 weight loss calculator to understand potential outcomes at different Mounjaro doses, and speak with a prescriber about which route suits your circumstances best.
- 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 sweating a common side effect of Mounjaro?
No. Sweating is not listed as a very common or common side effect in SURMOUNT trial data or UK prescribing information. Nausea, diarrhoea, and constipation are the most frequently reported side effects. Some individuals may experience mild perspiration during dose adjustments, but this is not the norm and typically resolves as your body adapts.
What are the most common Mounjaro side effects?
Very common side effects (affecting more than 1 in 10 people) include nausea, diarrhoea, vomiting, constipation, and stomach pain. Common side effects include indigestion, fatigue, dizziness, and injection site reactions. Most side effects improve after the first few weeks or as your body adjusts to the medication.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £150–£320 per month depending on your dose and pharmacy. Starting doses (2.5–5 mg) are typically at the lower end, while higher maintenance doses (10–15 mg) cost more. Prices vary between providers, so it's worth comparing before starting treatment.
How do I access Mounjaro on the NHS in the UK?
You'll need a referral from your GP to a tier 3 specialist weight management service. NICE has approved tirzepatide for NHS use, but regional availability and waiting lists vary considerably. Contact your local integrated care board (ICB) or ask your GP about NHS specialist services in your area.
What is Mounjaro dose titration and does it cause side effects?
Dose titration is the gradual increase in Mounjaro strength—starting at 2.5 mg, then increasing every 4 weeks up to your maintenance dose (typically 10 or 15 mg). Side effects like nausea or mild sweating may be more noticeable during dose escalation but usually settle as your body adjusts. Your prescriber will monitor your progress throughout this process.
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.