Mounjaro Side Effects

The most frequently reported side effects tend to appear during dose adjustments and usually ease as your body adapts. These include:

• A general sense of weakness
• Burping and flatulence
• Constipation
• Diarrhoea
• Gastrointestinal discomfort
• Nausea
• Vomiting
• Dizziness
• Hair loss
• Low blood pressure
• Lethargy
• Feelings of malaise
• Injection site reactions like irritation, itching and bruising.

Our clinical team is always available — you’ll never wait more than 5 minutes to speak with someone if you need support.

Side effects — if they happen — often begin within the first few days of treatment. According to a 2023 review of the evidence, gastrointestinal symptoms tend to appear within two weeks of beginning Mounjaro, but they are typically mild and short-lived. You may also experience side effects any time you up your dose.

From day one, you’ll have support from our clinical team. If you experience any symptoms or have questions, our clinicians are here to help — quickly and whenever you need.

There are lots of practical strategies you can adopt to help reduce the side effects of Mounjaro:

For nausea:

• Eat smaller, more frequent meals
• Drink ginger or peppermint tea
• Eat more slowly
• Steer clear of fried, greasy or strong-smelling food
• Avoid alcohol and caffeine, especially as you start treatment

For diarrhoea and vomiting:

• Make sure to drink lots of fluids
• Get plenty of rest
• Avoid foods and drinks that aggravate the problem (think coffee, alcohol, or full-fat dairy)

For constipation:

• Drink plenty of water
• Avoid alcohol
• Eat foods high in fibre (such as wheat bran and oats)
• Eat fruits containing sorbitol (apples, apricots grapes, raisins, raspberries, and strawberries)

If you’re still having trouble, speak to a Voy clinician — they’re here to help you manage symptoms and adjust your medication if needed, at any time.

Mounjaro is a regulated and approved treatment for obesity in the UK. To ensure your safety, always get your prescription from a reputable provider registered with the UK General Pharmaceutical Council—you’ll find their registration displayed in a green box at the bottom of their website page.

It’s also important to choose a provider that gives you access to clinicians. At Voy, our in-house UK prescribing clinicians are always available to support you.