Why Is Wegovy Making Me Constipated — and What Can I Do?

Why does Wegovy slow things down in the first place?

Semaglutide activates GLP-1 receptors across the body, including in the gut wall and the brain. One of the direct results is reduced gastric motility, your stomach empties more slowly than it otherwise would. That mechanism is useful for weight management because it extends the feeling of fullness after eating. The trade-off is that the same slowdown can ripple through the rest of your digestive system, and if you have ever wondered does Wegovy constipate you, the honest answer is that it can, particularly in the first month or after stepping to a higher dose.

Reduced appetite is also a factor worth naming. Eating substantially less (especially less fibre and less fluid) makes constipation more likely regardless of the medication. People often underestimate how much their food and drink intake has changed, so it is worth pausing for a quick check: are you drinking at least six to eight glasses of water a day, and does your plate still include vegetables, wholegrains or legumes? That single habit check takes under a minute and can point you to the most obvious fix.

The good news is that for most people the symptom does settle. The NHS guidance on semaglutide lists constipation alongside other gastrointestinal effects and notes that these typically improve as the body adapts. If you want more detail on the full pattern of gut-related side effects, including whether Wegovy makes you constipated and why it happens, the overview of Wegovy side effects covers the broader picture.

What practical steps can actually help?

The first line of response is lifestyle-based, and it is often enough. Increasing fluid intake is the single most straightforward lever, water and herbal teas count; caffeine in large amounts can have the opposite effect. Dietary fibre from vegetables, fruit with the skin on, oats, lentils and wholegrains adds bulk and draws water into the bowel. If your appetite has dropped significantly on Wegovy, eating smaller amounts more frequently, rather than skipping meals, can keep things moving.

Physical activity helps too. Even a daily 20-minute walk supports gut motility. It does not need to be intense, consistent movement is the relevant variable.

Over-the-counter options such as bulk-forming laxatives (for example, ispaghula husk) are generally considered the safest starting point for medication-related constipation because they work with your natural gut physiology rather than stimulating it artificially. Osmotic laxatives are also commonly used. That said, which approach suits you depends on your full medical picture, and your prescriber is the right person to advise on anything beyond basic dietary changes. If you find yourself constipated on Wegovy and want to understand the typical duration and patterns of what you are experiencing, that can help you gauge whether your symptoms are in line with what most people go through.

If symptoms began with a dose increase, that timing is worth mentioning to your prescriber. Titrating more gradually is sometimes considered in people who find side effects difficult to manage at each step. Our clinical team discusses symptoms like these as part of ongoing care, it is exactly the kind of thing a prescriber review is for.

When does constipation on Wegovy need medical attention?

Most constipation on Wegovy is uncomfortable rather than dangerous, and it improves with the steps above. There are specific patterns, though, that mean you should contact a doctor or call 111 rather than waiting.

Severe abdominal pain that does not ease, particularly pain that radiates towards your back and is accompanied by vomiting or feeling very unwell, should be assessed urgently. The MHRA issued a Drug Safety Update in January 2026 specifically flagging acute pancreatitis as an infrequent but serious risk with GLP-1 medicines, persistent severe stomach pain is the symptom to act on promptly, not wait out.

Other reasons to get same-day or urgent advice: you have not opened your bowels for more than a week despite trying the measures above; you notice blood in your stool; you have significant bloating alongside vomiting; or you feel seriously dehydrated because the constipation is combined with other gut symptoms. Dehydration can affect kidney function, so it matters more than it might seem.

If you experience something unexpected on Wegovy that you believe may be a side effect, you can report it directly through the MHRA Yellow Card scheme, patients can submit reports themselves, not just clinicians, and the data genuinely shapes future safety communications.

Should constipation make me stop Wegovy?

Stopping treatment because of manageable constipation is rarely the right call, and doing so without speaking to your prescriber first means losing any clinical input on whether the symptom can be addressed. If Wegovy makes you constipated, it is worth knowing that most people find it peaks early in treatment and becomes less noticeable within a few weeks.

The more useful question is whether the symptom is being appropriately managed. If you have tried the dietary and fluid steps and things have not improved after a couple of weeks, your prescriber may adjust your approach, whether that means reviewing your dose timing, recommending a specific over-the-counter remedy, or considering your wider health picture.

Wegovy is a prescription-only medicine, which means continued treatment should be clinically supervised. If you are experiencing ongoing side effects and not currently receiving structured support, our prescribers cover exactly this as part of the aftercare included with every treatment. You can also read more about how Wegovy works and who it is suitable for, or explore weight management treatment options more broadly. For anyone still deciding whether to start, the consultation is the right place to raise these concerns, check your eligibility and speak to our prescribers about what to expect.