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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Can You Take Mounjaro and Apixaban Together?
Mounjaro (tirzepatide) and apixaban are two very different medications that may be used together in some UK patients. Mounjaro is a once-weekly weight management injection, whilst apixaban is a blood thinner prescribed to reduce stroke and clot risk. There is no known direct interaction between these two medicines. However, because both can affect digestion and medication absorption, it's important to understand how they work together. This guide explains the basics and why you should always discuss any concerns with your GP or pharmacist before starting or stopping either medication.
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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.
How Mounjaro and Apixaban Work Differently
Mounjaro (tirzepatide) is a GIP and GLP-1 receptor agonist that works by mimicking natural hormones to help regulate appetite and blood sugar. It is delivered as a once-weekly injection via a Mounjaro KwikPen and slows how quickly food leaves your stomach. Apixaban (brand name Eliquat) is an anticoagulant—a blood-thinning medication that prevents clots by blocking a specific clotting factor. It works in the bloodstream and is taken orally, typically twice daily.
Because they work through entirely different mechanisms, there is no established pharmacological interaction between Mounjaro and apixaban. However, both medicines can affect how your digestive system functions, which may indirectly influence how well your body absorbs oral medications.
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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.
Important Considerations and Pharmacist Guidance
If you take apixaban and are considering Mounjaro, inform your GP or prescriber immediately. Mounjaro can slow gastric emptying—the rate at which food and liquids move through your stomach—which may theoretically affect the absorption of oral medications like apixaban, though this is not formally documented as a clinical concern.
More importantly, if you are overweight or obese and taking apixaban for cardiovascular protection, weight loss achieved through Mounjaro may improve your heart health and potentially reduce your ongoing need for anticoagulation—a conversation worth having with your cardiologist or GP. Your healthcare provider can assess your individual risk and adjust medications if needed as your weight changes.
- 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.
Is there a direct drug interaction between Mounjaro and apixaban?
No direct pharmacological interaction is documented between Mounjaro (tirzepatide) and apixaban. However, because Mounjaro can slow gastric emptying and apixaban is an oral medication, it's sensible to discuss timing and absorption with your pharmacist or GP to ensure optimal effectiveness of both medicines.
Can I start Mounjaro if I'm already taking apixaban?
Yes, many UK patients take both medications. You must inform your prescriber that you take apixaban before beginning Mounjaro. Your GP or specialist will assess whether Mounjaro is appropriate for you and may monitor your weight loss progress, as significant weight loss can affect cardiovascular risk and potentially alter your anticoagulation needs.
Does Mounjaro affect how apixaban works?
There is no established clinical evidence that Mounjaro directly reduces apixaban's effectiveness. However, because Mounjaro affects digestion, spacing doses appropriately (as advised by your pharmacist) is sensible. If you have any concerns about blood clotting or bruising after starting Mounjaro, contact your GP immediately.
What should I tell my GP before starting Mounjaro if I take apixaban?
Tell your GP or prescriber: you take apixaban, why you take it (e.g. atrial fibrillation, previous clot), any other medications, and any digestive conditions. Be honest about your weight loss goals. Your healthcare team can then assess Mounjaro's suitability, monitor your progress, and adjust your anticoagulation if weight loss significantly improves your cardiovascular health.
How does Mounjaro compare to Wegovy for someone on apixaban?
Both Mounjaro and Wegovy are once-weekly weight management injections with no known interaction with apixaban. Mounjaro is a dual GIP/GLP-1 agonist (typically producing ~15–21% average weight loss), whilst Wegovy is a GLP-1-only agonist (~15% average loss). Choice depends on your NHS NICE eligibility, individual health profile, and prescriber recommendation—not on apixaban use.
Ready to take control of your weight loss journey?
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