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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Does Mounjaro Make You Sweat?
Mounjaro (tirzepatide) is not commonly associated with sweating as a documented side effect in clinical trials, though some users report changes in temperature regulation. Wegovy (semaglutide), the GLP-1 alternative, shows a similar profile. Both are prescription-only weight management injections licensed in the UK and require clinical assessment. The side effects experienced during treatment are highly individual and often depend on dose, metabolism, and how your body responds to the medication. This guide compares the sweating and temperature-related experiences between Mounjaro and Wegovy to help you understand what to expect.
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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.
Sweating and Temperature Changes: Mounjaro vs Wegovy
Sweating is not listed as a common or very common side effect in either the Mounjaro or Wegovy clinical trials (SURMOUNT-1 and STEP-1 respectively). However, both medications can indirectly affect temperature regulation through their mechanism of action.
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist — slows gastric emptying and affects metabolic rate, which may cause some users to feel warmer or experience mild temperature fluctuations, particularly in the first few weeks of use or during dose titration.
- Wegovy (semaglutide) — a GLP-1 receptor agonist only — works similarly but through a single mechanism, and sweating-related reports are equally uncommon in clinical data.
Changes in body temperature are more likely linked to gradual weight management, metabolic adaptation, or individual sensitivity rather than a direct drug effect. If you experience unusual or persistent sweating after starting either medication, inform your prescriber.
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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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Which is Right for You? Individual Suitability and Prescriber Assessment
Neither Mounjaro nor Wegovy is universally "better" — both are effective prescription-only weight management treatments approved in the UK for adults with a BMI of 30 or above (or 27+ with weight-related health conditions). Your eligibility and suitability depend on your individual health profile, medical history, and how your body responds to GLP-1 and GIP mechanisms.
Use our free GLP-1 weight loss calculator to estimate potential outcomes, and our BMI calculator to assess your baseline. A UK-licensed prescriber will evaluate your circumstances and determine whether Mounjaro, Wegovy, or neither is appropriate for you. Sweating as a concern is rarely a deciding factor — focus on efficacy, tolerability of nausea or digestive changes, and your personal health goals.
- 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.
Does Mounjaro make you sweat more than Wegovy?
Sweating is not a documented common side effect of either medication in clinical trials. Both Mounjaro and Wegovy may cause mild temperature changes due to metabolic effects and gradual weight management, but this is individual and rarely a significant concern. If sweating is bothersome, discuss it with your prescriber — it may be unrelated to the medication.
What side effects are most common with Mounjaro and Wegovy?
The most common side effects for both are gastrointestinal: nausea, diarrhoea, constipation, and stomach pain. These typically occur in the first few weeks or during dose titration and often improve over time. Sweating or temperature changes are not listed as very common or common in either drug's safety profile.
Can weight loss itself cause sweating?
Yes. gradual weight management increases metabolic activity and can trigger night sweats or increased temperature regulation. This is a normal physiological response to significant body composition change and is not specific to Mounjaro or Wegovy. It usually resolves as your body adapts.
How do I know if sweating is a side effect of the medication?
If sweating started after beginning Mounjaro or Wegovy and is persistent or troubling, contact your GP or prescriber. They can assess whether it's medication-related, linked to weight loss, or another cause. Keep a symptom diary noting when sweating occurs and any patterns.
Will my prescriber consider sweating when deciding between Mounjaro and Wegovy?
Not typically — sweating is too rare to be a deciding factor. Your prescriber will assess BMI, weight-related health conditions, medication interactions, and your preferences. If you have existing temperature regulation problems, mention them during your clinical assessment.
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