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 You Drink Alcohol While Taking Mounjaro?
There is no absolute NHS contraindication against alcohol while taking Mounjaro (tirzepatide), but alcohol combined with this weekly weight loss injection may increase certain risks and side effects. The NHS recommends caution when combining alcohol with any weight management medication. Your prescriber should discuss alcohol consumption as part of your treatment plan before starting Mounjaro as a weight loss injection in the UK. Individual circumstances vary, so always check with your GP or the prescriber managing your prescription weight loss treatment.
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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 Alcohol Affects Mounjaro Treatment
Alcohol can interact with Mounjaro in several important ways that concern UK prescribers. Alcohol is metabolised by the liver and may increase the risk of liver-related side effects, particularly in people with existing liver conditions. Mounjaro may slow gastric emptying (how quickly food leaves your stomach), and alcohol can compound this effect, potentially worsening nausea, vomiting, and stomach discomfort—already common side effects of the medication.
- Alcohol can increase dehydration, which is already a risk during Mounjaro dose titration
- Alcohol may affect blood sugar levels, which is particularly important if you have type 2 diabetes or prediabetes (common reasons for Mounjaro eligibility)
- Alcohol contains empty calories and may undermine the calorie deficit needed for weight loss alongside the injection
- Combining alcohol with Mounjaro may increase dizziness, fatigue, or other CNS side effects
The NHS emphasises that prescription weight loss treatment works best alongside a reduced-calorie diet and increased physical activity—alcohol is generally not compatible with these lifestyle goals.
Clinically BackedWeight Loss
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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.
What Your Prescriber Will Advise
When you are assessed for Mounjaro, your prescriber will ask about your alcohol consumption as part of your medical history. If you are currently drinking regularly or heavily, this will be discussed openly—UK prescribers are non-judgmental about alcohol use but need accurate information to assess safety.
- If you drink occasionally and in moderation, you may be advised it is generally low-risk, but caution is recommended
- If you drink regularly or heavily, your prescriber may recommend reducing alcohol significantly while on Mounjaro
- If you have a history of liver disease, alcohol misuse, or pancreatitis, alcohol while taking Mounjaro may be strongly discouraged
Always discuss any alcohol consumption with your prescriber before starting treatment and inform them if your drinking habits change while taking the medication. Use our GLP-1 weight loss calculator to understand your treatment timeline and discuss alcohol plans with your prescriber.
- 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 alcohol completely banned while taking Mounjaro?
No absolute ban exists, but NHS guidance recommends caution. Alcohol may worsen nausea, affect blood sugar control, and add empty calories. Your prescriber will assess your individual risk based on your medical history, current health, and alcohol consumption pattern. Always discuss your alcohol use before starting Mounjaro.
Can I have a glass of wine occasionally on Mounjaro?
Occasional moderate alcohol consumption may be lower risk than regular drinking, but individual tolerance varies. Some people experience worsened nausea or stomach discomfort when combining alcohol with Mounjaro, particularly during dose titration weeks. Check with your prescriber—they know your full medical picture and can give personalised advice.
Will alcohol affect how Mounjaro works?
Alcohol may reduce Mounjaro's effectiveness for weight loss by adding unnecessary calories and potentially affecting blood sugar regulation. Alcohol can also worsen gastric side effects and may impact liver function. For best results with this weekly weight loss injection, minimising or avoiding alcohol is generally recommended alongside dietary and activity changes.
What if I have a special occasion and want to drink alcohol on Mounjaro?
Discuss this with your prescriber beforehand rather than making the decision alone. Some prescribers may advise limiting intake on specific occasions, while others may recommend avoiding it entirely depending on your health profile. Never exceed recommended alcohol limits (14 units per week in the UK) regardless of Mounjaro use.
Are there any signs I should stop alcohol while on Mounjaro?
Yes—stop alcohol immediately and contact your prescriber if you experience severe stomach pain, persistent vomiting, signs of pancreatitis, or unusual fatigue. These could indicate serious side effects. Additionally, if you notice worsened nausea, dizziness, or difficulty controlling blood sugar after drinking, discuss this with your GP or prescriber.
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.