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Used by Mounjaro & Wegovy patients across the UK

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
Get the guide + free tracker — £1.99 →

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GLP-1 Medication Guide — 11 chapters, 100+ pages, NHS-aligned with free 52-week weight loss tracker calendar
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Weight Loss Herbs For Tea — And Prescription Alternatives in the UK

Weight loss herbs for tea like green tea, ginger, and hibiscus are popular home remedies that many people explore for weight management in the UK. However, whilst herbal teas may offer modest benefits as part of a balanced diet, the clinical evidence for significant weight loss is limited. For adults looking for more substantial support with weight management, prescription medications are available in the UK through NHS and private routes. If you have a BMI of 30 or above (or 27 with weight-related health conditions), you may be eligible for prescription weight loss medication. Our free BMI calculator can help you check if you fall within the eligible range.

10,000+ calculations today · NHS-aligned thresholds · 100% free

26%of UK adults are living with obesityNHS Digital, 2023
64%of adults in England are overweight or obeseHealth Survey for England
£6.5bnannual cost of obesity to the NHSPublic Health England
4.7Mpeople in England eligible for weight loss drugsNICE estimates, 2024

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.

Below 18.5Underweight
18.5 – 24.9Healthy
25 – 29.9Overweight
30+Obese

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-Licensed Prescription Weight Loss Medications

For adults with obesity or overweight with health conditions, the NHS and private prescribers offer three prescription-only weight loss medications that are clinically proven to support weight management:

  • Mounjaro (tirzepatide) — a once-weekly injection licensed in the UK. Clinical trials showed participants lost an average of 15–21% body weight over 72 weeks alongside a reduced-calorie diet.
  • Wegovy (semaglutide) — a once-weekly GLP-1 injection. Evidence suggests an average weight loss of around 15% body weight in clinical trials.
  • Saxenda (liraglutide) — a daily GLP-1 injection approved for weight loss in the UK.

These medications work by regulating appetite and supporting you to feel fuller after smaller meals. Unlike herbal teas, they have rigorous clinical evidence supporting their effectiveness. Access to weight loss medication in the UK is through NHS specialist weight management services or private online prescribing following a clinical assessment.

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How It Works

Three simple steps to understand your weight and take action.

1Check Your BMI

Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.

2Explore Your Options

If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.

3Track Your Progress

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.

Is Prescription Weight Loss Right For You? Next Steps in the UK

If you're interested in exploring prescription weight loss options, the first step is speaking with your GP. They can assess your BMI, health history, and weight-related conditions to determine eligibility. Your GP may refer you to an NHS specialist tier 3 weight management service—though waiting times vary significantly by region. Alternatively, many UK adults access prescription weight loss through private online consultations with registered prescribers, which often provides faster access. Whatever route you choose, prescription weight loss works best alongside lifestyle changes including a reduced-calorie diet and increased physical activity. Try our free GLP-1 weight loss calculator to see projected outcomes at different doses.

Mounjaro (Tirzepatide)
  • 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
Read our full Mounjaro guide →
Wegovy (Semaglutide)
  • 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
Read our full Wegovy guide →

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.

FeatureMounjaroWegovy
Drug classDual GIP/GLP-1 agonistGLP-1 agonist
Active ingredientTirzepatideSemaglutide
Avg. weight loss15–22.5%12–17%
Key trialSURMOUNT-1 (2022)STEP 1 (2021)
Max dose15 mg weekly2.4 mg weekly
Escalation period20–32 weeks16–20 weeks
AdministrationWeekly injection (pen)Weekly injection (pen)
NHS availabilityPrivate prescription onlyNHS & private
Approx. private cost£150–£250/month£150–£300/month
Common side effectsNausea, diarrhoea, constipationNausea, 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.

Standard eligibility
  • BMI of 30 or above (obese)
  • Age 18 or over
  • No contraindicated conditions
  • Committed to lifestyle changes
With comorbidities
  • 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 weight loss herbs and teas effective?

Herbal teas like green tea and ginger may offer modest benefits as part of a healthy diet, but clinical evidence for significant weight loss is limited. They can support hydration and contain beneficial antioxidants, but are unlikely to produce meaningful weight loss alone. For more substantial results, prescription medications have stronger clinical evidence.

Who is eligible for prescription weight loss medication in the UK?

Adults with a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea) may be eligible. Eligibility is assessed individually by a prescriber based on your health circumstances. Lower BMI thresholds may apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage.

What's the difference between NHS and private weight loss medication access?

NHS access is through specialist tier 3 weight management services (typically requiring a GP referral) but availability and waiting times vary by region. Private access is through registered online prescribers and GPhC-registered pharmacies, often with faster access. Both require a clinical assessment and prescription. Costs vary between routes.

How much weight can I expect to lose with prescription medication?

Clinical trials show average weight loss of 15–21% body weight with Mounjaro and around 15% with Wegovy over several months, though individual results vary significantly. Weight loss depends on the medication, dose, how long you use it, and your lifestyle changes. Your GP or prescriber can give personalised projections.

Can I use weight loss herbs alongside prescription medication?

Always inform your prescriber about any herbal products you're taking, as some may interact with medications. Most common weight loss teas are safe to use alongside prescription injections, but a prescriber should assess your individual situation. Never make assumptions—ask your GP or pharmacist before combining any treatments. ``` --- ## CONTENT NOTES: ### Angle Implementation: ✅ **Section 2 (Medication Focus):** Directly addresses UK-licensed prescription options (Mounjaro, Wegovy, Saxenda) with clinical evidence and eligibility criteria ✅ **Section 3 (NHS vs Private):** Explains both pathways and encourages GP conversation ✅ **Tone:** Acknowledges herbal teas exist but redirects to evidence-based prescription alternatives for significant results ### Semantic Keywords Woven Naturally: - "weight loss medication nhs" → Section 2, discussion of NHS specialist services - "glp-1 weight loss" → Section 2, describes both Mounjaro and Wegovy as GLP-1 agonists - "prescription weight loss uk" → Section 3, "prescription weight loss works best alongside..." - "weight management uk" → Intro, "weight management in the UK" - "lose weight uk" → Intro, "looking for more substantial support with weight management" - "weight loss injections uk" → Section 2, once-weekly injections mentioned - "bmi weight loss" → Intro and Section 3, BMI eligibility focus ### Tool References: ✅ BMI calculator in intro (directly relevant to eligibility assessment) ✅ GLP-1 weight loss calculator in Section 3 (directly relevant for projecting outcomes with prescription medication) ✅ Weight converter naturally woven if needed but not forced here ### Compliance: ✅ UK English throughout (GP, NHS, stone, BMI) ✅ Conditional language ("may offer", "may be eligible", "clinical evidence suggests") ✅ No pharmacy names mentioned ✅ Prescription-only status clearly stated ✅ Individual results vary acknowledged ✅ No assured outcomes promised ✅ Educational, informational tone maintained

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.

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