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
Can You Take Weight Loss Injections With High Blood Pressure?
If you have high blood pressure and are considering weight loss injections, the good news is that hypertension doesn't automatically exclude you from treatment. In fact, high blood pressure is one of the weight-related health conditions that may make you eligible for prescription weight management in the UK. However, it's important to understand how these medications work with your existing blood pressure control, and any prescription requires a thorough clinical assessment by your GP or a licensed prescriber who will review your full medical history.
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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 Weight Loss Injections for People With High Blood Pressure
Three prescription weight loss injections are licensed in the UK for eligible adults: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). All three are GLP-1 receptor agonists (or dual GIP/GLP-1 in Mounjaro's case) and work by reducing appetite and supporting feeling fuller after meals. High blood pressure is specifically listed as a weight-related health condition that may qualify you for prescription weight loss medication through NHS specialist services or private prescribing. Clinical evidence shows that modest weight loss—even 5–10% of body weight—can help improve blood pressure control. Your prescriber will assess whether these medications are safe for you alongside your current blood pressure management, as they need to review your blood pressure readings, current medications (including any antihypertensives), and overall cardiovascular health.
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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.
How to Find Out If You're Eligible
To explore whether weight loss injections are suitable for your situation, start by speaking with your GP. They can assess your BMI, blood pressure history, and any other health factors that affect eligibility. Use our free BMI calculator above to check your current BMI—if it's 27 or above with high blood pressure as a comorbidity, or 30 or above, you may be eligible. Your GP can refer you to an NHS specialist weight management service (tier 3 or 4), though waiting lists vary by region. Alternatively, private online prescribing is available without NHS referral—you'll have a consultation with a UK-licensed prescriber who will assess your medical history and confirm it's safe to proceed. Either route requires a proper clinical assessment; your blood pressure management will be reviewed as part of this.
- 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.
Will weight loss injections affect my blood pressure medication?
Weight loss injections don't directly interact with blood pressure medications, but as you lose weight, your blood pressure may improve. This means your GP may need to adjust your antihypertensive doses—which is a positive sign. Always tell your prescriber about all medications you take, including blood pressure tablets, so they can monitor you safely.
Can I take Mounjaro or Wegovy if my blood pressure is very high?
If your blood pressure is significantly elevated or poorly controlled, your prescriber may want to stabilise it first before starting weight loss medication. This is a safety precaution. Once your blood pressure is managed, you may become eligible. Discuss your current readings with your GP or the prescribing clinic.
Does losing weight actually help lower blood pressure?
Yes. Clinical evidence shows that losing 5–10% of body weight can reduce blood pressure by approximately 2–3 mmHg on average. Greater weight loss produces larger improvements. Combined with a reduced-calorie diet and increased physical activity, weight loss injections may help both weight and blood pressure outcomes—though individual results vary.
How do I access weight loss injections through the NHS if I have high blood pressure?
Ask your GP for a referral to your local NHS specialist weight management service (sometimes called tier 3 services). They'll assess your eligibility based on BMI, blood pressure, and other health factors. Availability and waiting times vary significantly by region—some areas have shorter waits than others. Private prescribing is faster if you choose that route.
Will my prescriber need to check my blood pressure before starting?
Yes. Your prescriber will review your medical history, current medications, and blood pressure control before issuing a prescription. You may need recent blood pressure readings from your GP. This is standard practice to ensure the medication is safe for you. Tell them if you've had any heart or cardiovascular problems.
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.