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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Mounjaro and Blood Pressure Medications — What You Need to Know
If you're taking blood pressure medication and considering Mounjaro (tirzepatide), it's important to understand how these medicines interact. Mounjaro is a prescription-only weight management injection licensed in the UK that may help reduce appetite and support weight loss. This guide explains what you need to know about combining Mounjaro with antihypertensive medications, based on NHS and UK prescribing guidance. Your GP will assess whether it's safe for you to use both medicines together.
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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.
How Mounjaro and Blood Pressure Meds Interact
Mounjaro (tirzepatide), a dual GIP and GLP-1 receptor agonist, doesn't directly interact with most blood pressure medications. However, weight loss itself can affect blood pressure control, which is why medical supervision is essential. As you lose weight with Mounjaro, your blood pressure may naturally improve or decrease — meaning your blood pressure medication dose may need adjustment. Additionally, Mounjaro can cause side effects like dizziness, which may be compounded by certain antihypertensive medications.
- Weight loss typically improves blood pressure — requiring possible dose review
- Your prescriber must know about all blood pressure medications you're taking
- Dizziness risk increases with both Mounjaro and some blood pressure drugs
- Regular monitoring by your GP ensures medication doses remain appropriate
- Never adjust blood pressure medication doses without professional guidance
When prescribed through NHS tier 3 specialist weight management services or via a private online prescriber, a full medication history assessment is required before starting treatment.
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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.
Getting Mounjaro Safely With Blood Pressure Conditions
Adults with high blood pressure (hypertension) may be eligible for Mounjaro if they also have a BMI of 27 or above. Your GP or prescriber will assess whether the medicine is suitable based on your complete health picture, including your current blood pressure medication regime. You'll receive a Mounjaro KwikPen with full instructions and monitoring guidance. It's crucial to attend regular GP appointments while using Mounjaro so your blood pressure and medication doses can be reviewed. Use our free BMI calculator above to check your starting point, and our GLP-1 weight loss calculator to estimate potential outcomes — both tools help inform conversations with your healthcare team.
- 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 Mounjaro lower my blood pressure?
Weight loss with Mounjaro may naturally lower blood pressure over time, which is beneficial. However, this means your current blood pressure medication dose may become too strong, requiring adjustment by your GP. This is why regular monitoring is essential — your prescriber will review your blood pressure medication alongside your Mounjaro treatment.
Can I take Mounjaro if I'm on blood pressure medication?
Yes, you can typically take Mounjaro with blood pressure medications. However, your prescriber must know about all medications you're taking before starting treatment. A full clinical assessment is required to ensure the combination is safe for your individual circumstances.
Do I need to stop my blood pressure medication to use Mounjaro?
No — do not stop blood pressure medication without professional guidance. Your GP may adjust the dose as your weight decreases and blood pressure improves naturally. Never change or stop blood pressure medication without consulting your GP first.
Will Mounjaro interact with my antihypertensive drugs?
There is no direct pharmacological interaction between tirzepatide and standard blood pressure medications. However, the weight loss effect and side effects like dizziness mean your prescriber must monitor you carefully. Inform your GP or online prescriber of every blood pressure medication you take.
How often should I have blood pressure checks while on Mounjaro?
Your GP should review your blood pressure regularly — typically every 1–3 months initially, then as directed. This ensures your blood pressure medication remains at the right dose as your weight changes. Always attend scheduled appointments and report any unusual symptoms like persistent dizziness.
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.