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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What To Drink On Mounjaro — A UK Guide
When taking Mounjaro (tirzepatide), staying hydrated is important — but certain drinks may worsen nausea or stomach discomfort, which are common side effects. Water is always the safest choice, though other drinks like herbal tea, diluted juice, and electrolyte drinks can support hydration if tolerated. This guide explains what to drink safely on Mounjaro, which beverages to limit, and how hydration supports your weight management journey. If you're comparing Mounjaro with Wegovy, both medications have similar hydration considerations.
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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.
Best Drinks While Taking Mounjaro
Water is your best choice on Mounjaro. Staying hydrated helps manage nausea, supports digestion, and keeps your body functioning well during weight loss. Aim for 1.5–2 litres daily, though individual needs vary. Other safe drinks include:
- Herbal tea (chamomile, ginger, peppermint) — ginger may help ease nausea and stomach discomfort
- Bone broth or clear broths — low-calorie, hydrating, and easier on the stomach than solid foods
- Electrolyte drinks (low-sugar versions) — helpful if experiencing diarrhoea, as they replace lost minerals
- Diluted fruit juice (50/50 with water) — avoids high sugar intake while providing flavour
- Coconut water (unsweetened) — natural electrolytes, though monitor calories as part of your reduced-calorie diet
Sip drinks slowly rather than drinking large amounts at once, which can trigger nausea or stomach pain. Keep water nearby throughout the day.
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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.
Drinks To Limit Or Avoid On Mounjaro
Some drinks may worsen side effects or undermine your weight management:
- Sugary drinks and fizzy drinks — soft drinks, energy drinks, and colas add calories and may trigger nausea due to carbonation
- Alcohol — increases nausea risk, slows weight loss, and can interact with Mounjaro's mechanism; consult your prescriber before drinking
- High-caffeine beverages — strong coffee on an empty stomach may worsen stomach pain; switch to weaker tea or decaffeinated options
- Very hot drinks — wait for tea or coffee to cool slightly to avoid irritating your stomach
- Full-fat milk drinks — high fat can increase nausea; use semi-skimmed or plant-based alternatives
Your prescriber and pharmacist can give personalised advice based on your individual side effects and medical history.
- 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.
Can I drink alcohol while taking Mounjaro?
Alcohol is best limited or avoided on Mounjaro. It may worsen nausea, increase stomach discomfort, and slow weight loss. Alcohol also dehydrates you, which conflicts with staying hydrated on this medication. Always discuss alcohol use with your prescriber or GP before consuming any alcoholic drinks while on Mounjaro treatment.
Will carbonated water help me stay hydrated on Mounjaro?
Plain carbonated water (without added sugar or flavourings) is fine in moderation, though it may trigger bloating or mild nausea in some people. Still water is always the safest choice. If carbonation bothers you, switch to flat water. Test small amounts first to see how your stomach responds.
How does hydration on Mounjaro compare to Wegovy hydration needs?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are GLP-1 receptor agonists with similar hydration needs. Both can cause nausea and stomach discomfort, so water intake is equally important for both medications. Drink regularly and avoid sugary or carbonated drinks with either medication. Your prescriber will give dose titration guidance for your specific injection.
Can I drink herbal tea with ginger on Mounjaro to help nausea?
Yes, ginger tea is often well tolerated and may help ease nausea and stomach discomfort naturally. Make it weak rather than strong, and let it cool slightly before drinking. Other soothing herbal teas like chamomile or peppermint are also safe. Avoid adding sugar — drink it plain or with a small amount of honey if needed.
What if I struggle to drink enough water on Mounjaro?
If plain water feels difficult, try adding a sugar-free flavouring (lemon juice, cucumber slices, or a dash of herbal tea). Sip small amounts frequently throughout the day rather than drinking large volumes at once. Broths and electrolyte drinks also count toward hydration. If nausea is severe and prevents you drinking, contact your GP or prescriber — they may adjust your dose or recommend strategies to manage side effects.
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.