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 Reduce Blood Pressure? What the Clinical Evidence Shows
Yes, clinical evidence suggests Mounjaro may help reduce blood pressure in some adults, particularly those with excess weight and hypertension. Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are GLP-1-based medications licensed for weight management in the UK, and both have been associated with modest blood pressure improvements in clinical trials. However, the mechanisms differ slightly, and individual responses vary. This guide compares how each medication affects blood pressure, what the evidence shows, and how to decide which might be suitable following clinical assessment by a GP or licensed prescriber.
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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.
Mounjaro, Wegovy, and Blood Pressure — What Clinical Trials Show
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — a distinction that matters. In the SURMOUNT clinical trials, participants on Mounjaro experienced average reductions in systolic blood pressure of approximately 3–5 mmHg at higher doses (15 mg), alongside weight loss averaging 15–21% of body weight. These blood pressure improvements were generally modest but consistent.
Wegovy (semaglutide), a GLP-1-only agonist, showed similar trends in the STEP trials. Participants on Wegovy 2.4 mg experienced average systolic blood pressure reductions of around 2–3 mmHg, alongside approximately 15% average weight loss. The blood pressure benefit appears linked primarily to weight loss itself rather than a direct drug mechanism.
- Both medications require a UK prescription and clinical assessment
- Blood pressure improvements are typically modest and gradual
- Weight loss is the primary driver of blood pressure reduction
- Individual responses vary significantly — not everyone experiences blood pressure improvement
Neither medication is prescribed primarily as a blood pressure treatment. Instead, blood pressure improvement is a secondary health benefit of weight loss achieved through the medication.
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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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Everything you need to understand your weight, explore medication options, and track your progress — completely free.
How These Medications Work Differently — and Why It Matters
Mounjaro's dual mechanism (GIP + GLP-1) theoretically offers more appetite suppression than Wegovy's single GLP-1 pathway, potentially supporting greater weight loss. Greater weight loss may translate to more significant blood pressure reduction, though trials show the difference is modest. Both slow gastric emptying and increase feelings of fullness.
In practice, the blood pressure benefit of either medication depends far more on the amount of weight lost and lifestyle changes (diet and physical activity) than on the specific drug mechanism. Your GP or prescriber will assess which medication suits your individual health profile, blood pressure readings, other medications (especially blood pressure medications — doses may need adjusting), and weight management goals. Use our free BMI calculator above to check your current BMI, which helps determine eligibility for either medication in the UK.
- 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 directly lower blood pressure, or is it from weight loss?
Both mechanisms contribute, but weight loss is the primary driver. Mounjaro may have modest direct effects on blood pressure through its GIP/GLP-1 actions, but clinical trials show most blood pressure improvement is secondary to weight loss. Individual variability is high — not all users experience significant blood pressure reduction.
Which reduces blood pressure more — Mounjaro or Wegovy?
Clinical evidence suggests Mounjaro may produce slightly greater blood pressure reductions due to greater average weight loss (15–21% vs ~15%), but the difference is modest (typically 1–2 mmHg). For most people, both are effective. Your prescriber will recommend the most suitable option after clinical assessment.
How quickly does blood pressure improve on Mounjaro or Wegovy?
Blood pressure typically improves gradually alongside weight loss, usually over 4–8 weeks as weight loss progresses. Initial doses (2.5 mg Mounjaro, 0.25 mg Wegovy) produce minimal blood pressure change. Improvements accelerate as doses increase and weight loss accumulates.
Can I stop my blood pressure medication if I take Mounjaro or Wegovy?
No — never stop blood pressure medication without GP guidance. If you're prescribed Mounjaro or Wegovy, inform your GP immediately. You may need blood pressure monitoring and possible medication adjustments as weight decreases, but this must be managed by your prescriber. Blood pressure medications should never be stopped abruptly.
Am I eligible for Mounjaro or Wegovy on the NHS if I have high blood pressure?
High blood pressure (hypertension) is a qualifying weight-related health condition for NHS prescription of Mounjaro or Wegovy in the UK. You'd typically be referred to a specialist tier 3 weight management service. However, NHS availability varies significantly by region. Your GP can advise on local access and waiting times.
Ready to take control of your weight loss journey?
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