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 I Take Propranolol With Mounjaro?
If you take propranolol (a beta-blocker for blood pressure or heart conditions) and are considering Mounjaro for weight management, it's important to understand potential interactions. Propranolol and tirzepatide (the active ingredient in Mounjaro) can be taken together, but your GP or prescriber must be aware of both medications before starting Mounjaro. Always inform your prescriber about every medicine you're taking, including propranolol, so they can assess whether Mounjaro is suitable for you and whether any dose adjustments are needed.
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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 Propranolol and Mounjaro Interact
Propranolol and Mounjaro can generally be used together, but there are important interactions to understand. Propranolol is a beta-blocker that slows heart rate and lowers blood pressure. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist that affects appetite and blood sugar control. When combined, Mounjaro may further lower your blood pressure or affect heart rate, particularly during dose titration as you increase from the starting 2.5 mg dose to higher maintenance doses.
- Propranolol can mask some symptoms of low blood sugar (hypoglycaemia) — important if you also have diabetes
- Mounjaro may slow stomach emptying, potentially affecting how quickly propranolol is absorbed
- Your prescriber may need to monitor your heart rate and blood pressure more closely
- If you're taking propranolol for heart rhythm problems, your prescriber must assess suitability carefully
Always disclose your full medication list when discussing Mounjaro eligibility with a UK prescriber or NHS specialist weight management service.
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.
What Your GP or Prescriber Needs to Know
Before starting Mounjaro, tell your prescriber if you take propranolol regularly. This includes your GP (if exploring NHS eligibility through tier 3 specialist services) or your private prescriber (via online consultation). Your prescriber will review your individual health history, current propranolol dose, and the reason you're taking it. They may recommend blood pressure and heart rate monitoring while starting Mounjaro. In rare cases, propranolol dose adjustment may be needed once weight loss begins, as improved cardiovascular health can change medication requirements. Never stop or change propranolol without your GP's advice — it may be essential for your heart health.
- 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 stop my propranolol from working?
No. Mounjaro does not reduce propranolol's effectiveness. However, the combination may lower your blood pressure more than propranolol alone, so your prescriber may monitor you more closely. Always tell your prescriber about both medications.
Can propranolol mask Mounjaro side effects?
Propranolol can mask hypoglycaemia symptoms if you have diabetes, which is relevant if you're on Mounjaro. It won't mask nausea, diarrhoea, or other common Mounjaro side effects. Inform your prescriber if you experience unusual symptoms.
Do I need to adjust my propranolol dose if I start Mounjaro?
This depends on your individual health. Weight loss from Mounjaro can improve cardiovascular health, potentially changing propranolol requirements. Your GP will assess this during follow-up appointments. Never self-adjust propranolol — always consult your GP.
Can I get Mounjaro on the NHS if I take propranolol?
Yes, potentially. NHS eligibility depends on BMI and weight-related health conditions, not on propranolol use. However, your tier 3 specialist weight management service must assess your suitability, considering all your medications and medical history.
What should I tell my prescriber about propranolol before starting Mounjaro?
Tell them your dose, how long you've been taking it, and why it was prescribed (heart rhythm, blood pressure, anxiety, migraine). Mention any side effects or health conditions linked to your propranolol use so they can assess drug interaction risks accurately.
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.