Eggy Burps on Mounjaro? Side Effects - Explored | iQ Doctor

03 December, 2025  |  Holy Winter - Healthcare Writer

Eggy Burps on Mounjaro? Side Effects - Explored

Experiencing eggy/sulphur burps on Mounjaro? Learn why this happens, whether it’s normal, and how to manage Mounjaro side effects safely with iQ Doctor.

If you’ve recently started taking Mounjaro and noticed strange “eggy burps,” you’re not alone. Many users experience sulphur burps or a strong smell of rotten eggs after starting Mounjaro (tirzepatide) weight loss injections.

While this can be unpleasant, it’s usually harmless - and often a sign that your body is adjusting to the medication. In this article, we’ll explore why Mounjaro causes sulphur burps, whether it’s normal, and what you can do to minimise the side effects.

What Is Mounjaro?

Mounjaro is a once-weekly injection containing tirzepatide, a dual-acting GLP-1 and GIP receptor agonist used to support weight loss and improve blood sugar control.

It works by slowing digestion, reducing appetite, and regulating how your body handles glucose. These mechanisms help users lose weight effectively - but they can also lead to certain digestive side effects.

Why Does Mounjaro Cause Eggy/Sulphur Burps?

Sulphur burps (often described as “eggy burps”) are caused by hydrogen sulphide gas in the digestive tract. This gas naturally occurs when your body breaks down proteins or when food sits in the stomach longer than usual - both of which can happen with Mounjaro.

Here’s why:

• Delayed stomach emptying (gastroparesis) - Mounjaro slows down how quickly food leaves your stomach, which can lead to fermentation and gas build-up.
• Changes in gut bacteria - An altered digestive system may temporarily shift your gut microbiome, increasing sulphur gas.
• High-protein diets - Many people on Mounjaro eat more protein to preserve muscle during weight loss, which can produce more hydrogen sulphide.
• Dehydration or constipation - Both can worsen digestive odours and slow transit time.

The result? Burps that smell like rotten eggs - a mild, common side effect.

Are Eggy Burps on Mounjaro Dangerous?

Typically, no.

Eggy burps are considered a minor side effect of Mounjaro and often resolve as your body adapts. However, if they persist or occur alongside symptoms such as vomiting, bloating, severe nausea, or stomach pain, it could indicate gastrointestinal slowing or another issue that needs medical attention.

You should contact your healthcare provider if you experience:

• Persistent vomiting or dehydration.
• Intense abdominal pain.
• Inability to keep food down.
• Severe constipation or diarrhoea.

These could be signs that your dose needs adjustment.

Tips to Reduce Sulphur Burps While on Mounjaro

If you’re struggling with sulphur burps, the following steps may help:

• Eat smaller meals - Avoid overloading your stomach. Smaller, more frequent meals are easier to digest.
• Stay hydrated - Drinking plenty of water helps digestion and reduces gas build-up.
• Avoid sulphur-rich foods - Cut down on eggs, onions, garlic, broccoli, and red meat temporarily.
• Limit carbonated drinks - Fizzy drinks can increase gas and bloating.
• Stay active - Gentle movement after meals supports digestion.
• Ask your doctor about probiotics - These can help rebalance your gut bacteria.

If symptoms persist, your prescriber may suggest adjusting your Mounjaro dose or reviewing your diet plan.

Other Common Mounjaro Side Effects

Alongside sulphur burps, other side effects may include:

• Nausea
• Constipation
• Diarrhoea
• Abdominal discomfort
• Loss of appetite
• Fatigue

These are typically mild and improve over time. Most users find that once their body adjusts, the benefits of weight loss far outweigh the temporary side effects.

When to Speak to a Doctor

Always consult your healthcare provider if:

• Side effects persist beyond a few weeks.
• You experience severe stomach issues.
• You’re unsure whether your symptoms are normal.

At iQ Doctor, you can get medical advice and prescriptions for weight loss medication like Mounjaro, Wegovy, and others - safely and discreetly online.

Key Takeaway

Eggy burps are a common and generally harmless side effect of taking Mounjaro for weight loss, typically caused by slower digestion and minor changes in gut bacteria. With simple dietary adjustments and patience, most users find these symptoms fade over time.

However, if you experience severe discomfort or persistent issues, don’t hesitate to speak to a healthcare professional.

At iQ Doctor, we offer safe, UK-certified access to Wegovy injections, prescribed by registered clinicians after a simple online consultation. You’ll also receive ongoing guidance to help you achieve your goals safely and effectively.

Whether you’re researching Wegovy reviews or ready to begin your transformation, iQ Doctor is here to support every step of your journey.

iQ Doctor is a registered UK pharmacy that specialises in medical remedies for weight loss (including Wegovy and Mounjaro), erectile dysfunction, hair loss support and much more. Whether you require over-the-counter relief, or prescription-only medication, the experts at iQ Doctor can assist. Please get in touch if you need any further advice.

Also, be sure to keep in touch with iQ Doctor via our social media channels as well as keeping up to date with us by signing up to the mailing list.