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
Night Sweats During Weight Loss — What You Should Know
Night sweats during weight loss can be unsettling, but they're often a normal part of the process. Your body is working hard to regulate temperature as it loses weight and adjusts to hormonal changes. However, persistent or severe night sweats may warrant a GP conversation. If you're struggling with weight management in the UK, prescription options like Mounjaro and Wegovy are available following clinical assessment. Understanding what's normal—and when to seek support—helps you approach weight loss confidently and safely.
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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.
UK Prescription Weight Management Options
If night sweats are affecting your weight loss journey, speaking with your GP about prescription options may help. Three UK-licensed medications are approved for weight management in adults who meet eligibility criteria:
- Mounjaro (tirzepatide) — dual GIP and GLP-1 agonist, once-weekly injection. Clinical trials showed average weight loss of 15–21% of body weight over 72 weeks.
- Wegovy (semaglutide) — GLP-1 agonist, once-weekly injection. Average weight loss of around 15% of body weight in clinical trials.
- Saxenda (liraglutide) — GLP-1 agonist, once-daily injection. Effective for sustained weight management.
All three are prescription-only and require a clinical assessment to determine suitability. Eligibility typically applies to adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. Check your BMI using our free BMI calculator above to understand where you stand.
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.
NHS vs Private Access — How to Proceed
Accessing prescription weight management in the UK depends on your route. NHS access involves referral to a tier 3 specialist weight management service through your GP — availability varies significantly by region, and waiting lists can be lengthy. Private access is available through GPhC-registered online prescribing services following a consultation with a UK-licensed prescriber, often with faster turnaround. Either way, discuss night sweats and overall health with your prescriber. They'll assess whether medication suits you and monitor your progress. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, then have an informed conversation with your GP about which option fits your circumstances.
- 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.
Are night sweats during weight loss normal?
Yes, often. Night sweats can happen as your body adjusts to weight loss and hormonal shifts. However, if they're severe, persistent, or accompanied by fever or other symptoms, speak to your GP to rule out other causes like infection or thyroid issues.
Can prescription weight loss medication cause night sweats?
Nausea and digestive changes are common with GLP-1 medications like Mounjaro and Wegovy, but night sweats aren't typically listed as a primary side effect. If sweats occur after starting medication, inform your prescriber so they can assess whether it's related or coincidental.
How do I know if I'm eligible for prescription weight loss treatment in the UK?
Eligibility requires a BMI of 30 or above, or 27 or above with weight-related health conditions like diabetes or high blood pressure. Use our free BMI calculator to check your starting point, then discuss options with your GP or a licensed prescriber.
What's the difference between NHS and private weight loss medication access?
NHS access is through specialist services (longer wait times, region-dependent) and is free. Private access is faster and available without NHS referral but involves a cost (typically £129–£320+ per month depending on medication and dose).
Will prescription weight loss medication stop my night sweats?
Night sweats are usually caused by weight loss itself and hormonal adjustment, not lack of medication. Prescription medications help by supporting weight loss through appetite regulation. As you lose weight more steadily, sweats often improve naturally.
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.