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 Pregabalin — What You Need to Know
If you're taking pregabalin (Lyrica) for nerve pain or anxiety and considering Mounjaro for weight management, it's important to understand how these medications interact. Mounjaro is a prescription-only tirzepatide injection licensed in the UK for weight management in eligible adults. Pregabalin is commonly prescribed by GPs for conditions like diabetic neuropathy, fibromyalgia, and generalised anxiety disorder. This guide explains what you need to know about taking both medications together and how to discuss this with your GP or 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, Pregabalin, and Drug Interactions
Mounjaro (tirzepatide) and pregabalin do not have a major direct pharmacological interaction — they work through different mechanisms and are not known to significantly alter each other's effectiveness or safety. However, important considerations apply:
- Gastrointestinal effects: Mounjaro commonly causes nausea, diarrhoea, and constipation. Pregabalin may cause dizziness and fatigue. Together, these side effects could potentially be more noticeable, particularly gastrointestinal symptoms.
- Dizziness and balance: Pregabalin can cause dizziness. If Mounjaro causes nausea or dizziness, this combination may increase fall risk — especially important if you're older or have balance issues.
- Individual metabolism: Mounjaro may slow gastric emptying (how quickly food leaves your stomach), which could theoretically affect how quickly pregabalin is absorbed. However, this is generally not considered a major clinical concern.
The key point: no established contraindication exists, but your prescriber needs to know you're taking pregabalin so they can monitor you appropriately and manage any overlapping side effects.
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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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What Your GP or Prescriber Needs to Know
When discussing Mounjaro with your GP or online prescriber, always mention that you take pregabalin — include the dose and the condition it's prescribed for (nerve pain, anxiety, fibromyalgia, etc.). Your prescriber will assess whether Mounjaro is appropriate for you based on your complete medical history. If you're eligible for prescription weight loss medication through NHS tier 3 specialist weight management services, the specialist team will also review all your medications before starting Mounjaro.
If you're already taking Mounjaro and then prescribed pregabalin (or your pregabalin dose increases), inform your GP. Most importantly, never stop or adjust either medication without medical guidance. Both require proper monitoring to ensure they're working safely for you.
- 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 it safe to take Mounjaro with pregabalin?
Yes, there is no major direct interaction between Mounjaro and pregabalin. However, they may cause overlapping side effects like nausea, dizziness, and fatigue. Always inform your prescriber that you take pregabalin before starting Mounjaro so they can monitor you appropriately.
What is Mounjaro and how does it differ from Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist injection licensed for weight management. Wegovy (semaglutide) is a GLP-1-only agonist. Mounjaro has shown slightly higher average weight loss in clinical trials, but individual results vary significantly. Both are prescription-only.
Can pregabalin affect how Mounjaro works?
Pregabalin is unlikely to significantly affect Mounjaro's effectiveness. Mounjaro may theoretically slow how quickly medications are absorbed in the stomach, but this is not considered a major clinical concern for pregabalin.
What should I tell my GP about my medications?
Always provide a complete list of all medications, including pregabalin (dose and indication), before starting Mounjaro. Your GP or specialist prescriber needs this information to assess your eligibility and ensure safe prescribing.
Where can I get Mounjaro in the UK?
Mounjaro is available through NHS tier 3 specialist weight management services (via GP referral) or through private online prescribing with a UK-licensed prescriber. NHS access varies by region; waiting times can be significant in some areas.
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.