How to Treat Constipation on Wegovy

Why does Wegovy cause constipation in the first place?

Semaglutide activates GLP-1 receptors throughout the body, including in the gut wall. One effect is reduced gastric motility — the muscular contractions that push food and waste along the digestive tract slow down. When transit time increases, more water is absorbed from stool in the colon, making it harder and more difficult to pass. This is also why nausea, bloating and indigestion sit at the other end of the same mechanism.

Constipation tends to be most noticeable in the early weeks of treatment and after each dose increase, because those are the points at which semaglutide's effect on the gut is most pronounced. For many people it settles within a few days to a couple of weeks as the body adjusts, and our Wegovy constipation guide explains the underlying reasons in plain terms alongside what the evidence says about how often it occurs.

Reduced food intake (a natural result of the appetite suppression Wegovy produces) also contributes. Less food in means less bulk moving through the gut. It is worth keeping that in mind as you think through the adjustments below.

What actually helps? Steps to try before reaching for a laxative

The first thing to address is fluid intake. Aim to drink enough water throughout the day that your urine stays pale yellow. A practical way to build the habit is to keep a glass of water next to wherever you take the tablet or give the injection, for most people that is first thing in the morning, so the glass is ready before the kettle has even boiled. Coffee counts towards fluid in small amounts, but it can also have a mild laxative effect for some and a dehydrating one for others, so plain water remains the safer bet.

Fibre helps, but add it gradually. A sudden large increase (going from a low-fibre diet to a high one in a few days) can make bloating and discomfort worse before it makes constipation better. Introduce vegetables, legumes, oats and wholegrains steadily over one to two weeks. Soluble fibre (oats, flaxseed, psyllium husk) draws water into stool and softens it; insoluble fibre (wholemeal bread, bran, leafy greens) adds bulk. Both have a role.

Light physical activity helps gut motility too. Even a 20-minute walk after a meal can make a measurable difference to how quickly food moves through the digestive system, and if you want a closer look at the evidence behind each of these approaches, our advice on how to stop constipation on Wegovy walks through them in detail alongside our guide to helping constipation on Wegovy.

If those steps haven't helped after a week or so, over-the-counter options are available. Osmotic laxatives such as macrogol (sold as Movicol and other brands) draw water into the bowel and are generally considered suitable for short-term use alongside GLP-1 medicines, but check with a pharmacist or your prescriber before starting anything new, particularly if you're taking other medicines.

When should constipation on Wegovy prompt you to get medical help?

Most cases of constipation on Wegovy are uncomfortable rather than dangerous. The situations that need prompt medical attention are different, and it's worth knowing them clearly.

Call 999 or go to A&E if you experience severe abdominal pain that does not ease, particularly if it radiates to the back and is accompanied by vomiting. This pattern can indicate acute pancreatitis, a known but uncommon side effect of GLP-1 medicines. The MHRA highlighted acute pancreatitis in a Drug Safety Update published in January 2026, noting it as an infrequent but serious risk that requires urgent assessment.

Contact your prescriber or a pharmacist if: you have had no bowel movement for more than a week despite self-help measures; you notice blood in your stool or on the toilet paper; you have significant abdominal bloating or cramping that is worsening rather than improving; or constipation is accompanied by vomiting that is stopping you from keeping down fluids. These may be unrelated to Wegovy but they still need clinical review.

Our semaglutide constipation treatment page covers in more detail when treatment adjustments such as a dose pause or titration change might be appropriate, a decision that always rests with your prescriber, not a self-management protocol.

Should you mention constipation at your next prescriber review?

Yes, even if it seems minor. Constipation that persists across a dose period, or that becomes more pronounced with each titration step, is relevant information for the clinician reviewing your case. It can influence the pace of dose increases, prompt a discussion about long-term bowel health, and occasionally lead to a temporary pause before moving to the next dose.

At nume (sorry) at at our pharmacy, every repeat order goes through a same-day clinical review by a GPhC-registered prescriber before anything is approved or dispensed. That review includes your reported symptoms and side effects, not just your weight. Our clinical team can discuss whether what you're experiencing sits within the expected range or warrants a different approach. If you're weighing up treatment options or haven't started yet, our prescribers discuss suitability and side effects as part of the initial free consultation. You can also read more about how Wegovy works and what to expect across the treatment period.