Why Wegovy Can Cause Diarrhoea
Wegovy contains semaglutide, a GLP-1 receptor agonist that acts on appetite-regulating pathways in the brain and also slows the rate at which the stomach empties. This change in gut motility is the most likely reason many people experience looser stools, especially in the first few weeks or after moving to a higher dose.
When it tends to happen
For many people, diarrhoea on Wegovy is most noticeable in the day or two following an injection, or after eating — particularly after larger meals, higher-fat foods, or eating more quickly than usual. Reducing meal sizes and eating more slowly often helps, though how any individual responds will vary. Some people notice it only at the start of treatment; for others it eases gradually over several weeks.
Is it normal?
Gastrointestinal symptoms including diarrhoea, nausea, and constipation are listed in the official product information for Wegovy as commonly reported side effects. According to NHS guidance on semaglutide, these effects are generally mild to moderate and often improve over time. That said, everyone's experience is different, and your prescriber is best placed to assess what is normal for you specifically.
If you are also curious about how a related medicine compares, you can read about why Mounjaro commonly causes diarrhoea or explore whether Mounjaro causes diarrhoea for a broader picture of GLP-1 gastrointestinal effects. For a wider look at side effects across GLP-1 medicines, the guide to common GLP-1 side effects covers the full range. Some people also ask about other changes they notice; whether Wegovy causes hair loss is another topic worth knowing about.
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Tracking Diarrhoea and Gut Symptoms with GLP Trackr
One of the most useful things you can do when managing any recurring side effect is to log it consistently so patterns become visible over time.
Spot patterns with side-effect tracking
GLP Trackr's side-effect tracker lets you log gut symptoms — including diarrhoea, nausea, and bloating — each day, alongside the date and time of your injection. Over a few weeks, this can reveal whether symptoms cluster around injection day, follow certain meals, or are gradually improving. That kind of clear, dated record is genuinely useful to bring to your prescriber rather than trying to recall it from memory.
Connect symptoms to what you eat
Because diarrhoea after eating is a common pattern for some Wegovy users, logging meals alongside symptoms adds another layer of insight. The app's food logging — including an AI photo scan that reads a meal from a photo — makes it easy to capture what you ate without much effort, even when appetite is low or your routine is unpredictable. You may start to notice whether certain foods or meal sizes correspond with worse days.
GLP Trackr is a tracking tool, not a medical service — it is there to help you gather information to discuss with the people who know your full history. If diarrhoea is severe, persistent, or accompanied by other symptoms that concern you, contact your healthcare professional promptly rather than waiting. Any decision about your dose or treatment is one to make with your prescriber, not on your own.
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Frequently asked questions.
Yes, diarrhoea is a commonly reported gastrointestinal side effect of Wegovy (semaglutide). It is most frequent in the early weeks of treatment or after a dose increase, and many people find it eases as their body adjusts. Your prescriber can advise if it persists or is severe.
Wegovy slows gastric emptying and acts on gut motility pathways as part of its GLP-1 mechanism. This change in how quickly food moves through the digestive system is the likely reason loose stools are commonly reported, particularly around dose increases.
Some people on Wegovy notice diarrhoea specifically after eating, particularly after larger or higher-fat meals. Eating smaller portions more slowly may help, but individual responses vary. If this is happening regularly or affecting your daily life, discuss it with your prescriber or doctor.
For many people, gut symptoms including diarrhoea are most noticeable in the first few weeks or following a dose adjustment and often ease over time. How long it lasts varies between individuals. If symptoms are persistent or severe, contact your healthcare professional.
If diarrhoea is severe, frequent, or accompanied by signs of dehydration or other worrying symptoms, contact your healthcare professional promptly. Logging your symptoms in a tracker can help you provide a clear picture when you speak to your prescriber.