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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Female Weight Loss Tips: Medication and NHS Options in the UK
Effective weight management for women involves understanding all available options — from lifestyle changes to prescription medications now available through the NHS and private prescribing. Whether you're looking to lose weight for health reasons or to manage a weight-related condition, the UK health system offers several evidence-based approaches. This guide covers practical female weight loss tips, including prescription weight loss medication options, NHS pathways, and how to determine if you're eligible for treatment. Individual results vary, and sustainable weight loss typically combines dietary changes with increased physical activity.
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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-Licensed Prescription Weight Loss Options for Women
Three prescription medications are currently licensed in the UK for weight management, and many women have found them beneficial alongside lifestyle changes:
- Mounjaro (tirzepatide) — a once-weekly injection that activates dual GIP and GLP-1 hormone pathways. Clinical trials showed average weight loss of 15–21% body weight over 72 weeks, though individual results vary significantly.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. Evidence from clinical trials demonstrated approximately 14.9% average weight loss, again varying between individuals.
- Saxenda (liraglutide) — a daily GLP-1 injection, though less commonly prescribed than the once-weekly options.
All three are prescription-only medicines requiring clinical assessment. Women with a BMI of 30 or above, or 27 or above with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea), may be eligible. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, and try our BMI calculator to check where you currently stand on NHS weight management guidelines.
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 Get Started
NHS route: Ask your GP for a referral to your local tier 3 specialist weight management service. Availability varies significantly across England, Scotland, Wales, and Northern Ireland — some areas have waiting lists of several months. Your GP can assess your eligibility based on BMI and any weight-related health conditions.
Private route: Online consultations with UK-licensed prescribers are available through GPhC-registered pharmacies. You can access treatment without an NHS referral, though costs typically range from £129–£320 per month depending on dose. A prescriber will review your health history and determine suitability.
Whichever route you choose, weight loss medication works best alongside a reduced-calorie diet and increased physical activity. Track your progress with our free progress tracker to monitor results over time.
- 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.
What is the best weight loss medication for women?
There is no single "best" medication — individual results vary. Mounjaro and Wegovy are both effective once-weekly injections with strong clinical evidence. Your GP or prescriber will assess which is most suitable based on your health history, preferences, and any other medications you take.
How much weight can I realistically lose with GLP-1 medication?
Clinical trials showed average weight loss of 14–21% body weight over several months, but results vary considerably. Some women lose more, others less. Results are best when medication is combined with a reduced-calorie diet and regular physical activity.
Am I eligible for weight loss medication on the NHS?
You may be eligible if you have a BMI of 30 or above, or 27 or above with a weight-related health condition like type 2 diabetes or high blood pressure. Ask your GP about referral to a specialist weight management service, though NHS availability varies by region.
What are the most common side effects of weight loss injections?
Nausea, diarrhoea, constipation, and stomach pain are very common, particularly when starting or increasing doses. Most side effects reduce over time. Serious side effects are rare but include severe stomach pain (possible pancreatitis) — seek immediate medical attention if this occurs.
Can I switch between Mounjaro and Wegovy?
Switching between medications is possible but must be managed by your prescriber. There is no official conversion chart — any change requires clinical guidance. Do not attempt to switch doses without professional advice.
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.