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
Metallic Taste in Your Mouth with Mounjaro
A metallic taste in the mouth is an uncommon but reported side effect of Mounjaro (tirzepatide) that some UK patients experience during treatment. This sensation typically occurs early in treatment as your body adjusts to the medication, and often improves with time. If you're experiencing this side effect, it's worth understanding what's happening, how long it might last, and when you should speak to your GP or prescriber. This guide explains the causes, management strategies, and when to seek additional support whilst taking this tirzepatide prescription medication.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Why Does Mounjaro Cause a Metallic Taste?
A metallic taste during Mounjaro treatment isn't fully understood but is linked to how tirzepatide affects taste receptors and digestive processes. The medication works by activating GIP and GLP-1 receptor pathways, which slows gastric emptying (how quickly food leaves your stomach) and alters appetite signalling. These changes can affect taste perception and saliva composition, resulting in a metallic or unpleasant sensation in the mouth.
Metallic taste is classified as uncommon (affecting up to 1 in 100 people) rather than common or very common. It often appears within the first few weeks of starting Mounjaro or after dose escalation, particularly when stepping up from one dose to the next. Most patients report the taste diminishes as their body adjusts, typically within 1–4 weeks. However, individual experiences vary significantly.
Other taste disturbances reported with Mounjaro and similar GLP-1 medications include altered taste perception, reduced taste intensity, or preference changes for certain foods. These are generally mild and temporary.
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.
Managing Metallic Taste and When to Speak to Your GP
If you're experiencing a metallic taste, several practical strategies may help. Stay well hydrated — dehydration can intensify metallic sensations. Rinse your mouth with salt water or mouthwash, eat foods with strong, pleasant flavours (citrus, mint, ginger), and avoid foods that taste unpleasant during this period. Maintaining good oral hygiene may also help.
Contact your GP or prescriber if the metallic taste is severe, persistent beyond 4 weeks, or affecting your ability to eat. They can assess whether continuing your current dose is appropriate or if adjustments are needed. Report any taste changes during routine follow-ups — UK specialist services and private prescribers track side effects to support your treatment safely. Never stop Mounjaro without guidance, as this affects your weight management plan and requires proper clinical oversight.
- 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 a metallic taste a sign that Mounjaro isn't working?
No. Metallic taste is an uncommon side effect unrelated to how well Mounjaro is working for weight management. It's a taste disturbance caused by how the medication affects your digestive system and taste receptors, not a sign of efficacy or failure. The medication's weight loss effect is separate from this side effect.
How long does the metallic taste last with Mounjaro?
Most patients report metallic taste improves within 1–4 weeks as their body adjusts to tirzepatide. It may recur temporarily when you increase your dose, as your system adjusts to the higher amount. Some people experience it for longer, but this is less common. Your prescriber can advise on your individual timeline.
Can I use mouthwash or mints to help with the metallic taste?
Yes, sugar-free mints, mouthwash, and rinsing with salt water can provide temporary relief. Citrus flavours and ginger may also help mask or reduce the sensation. Stay hydrated and maintain good oral hygiene. These are practical management strategies used by UK patients taking Mounjaro alongside medical support.
Should I contact my GP if I have a metallic taste on Mounjaro?
Contact your GP if the taste is severe, persistent beyond 4 weeks, or affecting your ability to eat and drink. Mild metallic taste that improves over time doesn't typically require urgent action, but mention it during routine follow-up appointments so your prescriber can monitor your overall side effect profile.
Does a metallic taste mean I should stop taking Mounjaro?
No. Metallic taste alone is not a reason to stop Mounjaro without clinical advice. It's usually temporary and manageable. Always speak to your GP or prescriber before stopping any prescription medication — they can discuss whether continuing, adjusting your dose, or exploring alternatives is most appropriate for your health.
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.