Constipation on Ozempic happens because the medication slows your digestive system while you simultaneously eat and drink much less, which removes the bulk and fluid your bowel needs to work. The fix is deliberate: a daily fibre target of 25 to 30 g, around 2 litres of fluid, regular movement, and kiwifruit or prunes doing the heavy lifting. This is the plan that solves it for most of my clients.

Why it happens

Three things stack on top of each other. Semaglutide (Ozempic/Wegovy) slows gut motility directly. Your food volume drops, so there is less bulk to move. And many women drink less without noticing, because the thirst that used to come with meals fades when meals shrink. Less material, less water, slower transit: constipation is the predictable result, not a mystery.

That also means it responds well to nutrition, because you can put back what the medication and small appetite took out.

The fix-it plan

1. Hit a fibre number, not a vibe. Aim for 25 to 30 g daily. On a small appetite that requires density: legumes (half a cup of chickpeas is 7 g), high-fibre cereals like All-Bran or Weet-Bix, chia seeds (2 tablespoons is 7 g), pears and kiwifruit with skin on, grainy bread over white. Track it for three days; most women on GLP-1 medications are under 15 g without realising.

2. Two kiwifruit a day. Green kiwifruit has clinical trial support for constipation, works gently, and is small enough for a suppressed appetite. Prunes (4 to 6 daily) are the traditional alternative with similar evidence.

3. Fluid is half the battle. Fibre without water makes things worse. Sip toward 2 litres daily, more in an Australian summer. Warm drinks in the morning help some people get things moving.

4. Move daily. A 20 to 30 minute walk stimulates the bowel. It does not need to be exercise-shaped; it needs to be regular.

5. Respect the urge. Slowed transit means fewer signals. When one arrives, go. Deferring it repeatedly trains the bowel in the wrong direction.

6. Consider a fibre supplement as a bridge. Psyllium (Metamucil and equivalents) is a reasonable stopgap while food fibre climbs, start low with plenty of water. Check with your pharmacist about timing alongside your other medications. Where supplements genuinely help on a GLP-1 medication, and where they are a waste, is covered in vitamins on Ozempic.

What a high-fibre, small-volume day looks like

• Breakfast: Weet-Bix with milk, chia and a kiwifruit (10 g fibre)
• Lunch: grainy toast with cottage cheese and tomato, a pear (8 g)
• Snack: high-protein yoghurt with 2 prunes (2 g)
• Dinner: palm of chicken, half a cup of lentils through roast vegetables (9 g)

That is nearly 30 g of fibre inside a modest day of food, and it still hits the protein-first structure from what to eat on Ozempic. The two goals do not compete; they share a plate.

When it is more than a nutrition problem

See your doctor if you have no bowel motion for several days despite the plan above, severe bloating or abdominal pain, blood in your stool, or alternating constipation and vomiting. Your prescriber may adjust your management, and constipation this stubborn should not be self-treated indefinitely with laxatives.

Worth knowing: nausea patches often cause constipation a week later, because you ate and drank very little. If you are cycling between the two, the Ozempic nausea eating guide covers the other half of the loop.

Constipation is one of the five problems my free Muscle-First Checklist is built to prevent. For the complete nutrition system around your medication, start at GLP-1 dietitian Australia.

FAQ

How common is constipation on Ozempic? Very common; it is one of the most reported gastrointestinal side effects of semaglutide, alongside nausea. The combination of slower gut motility and much smaller food and fluid intake makes it almost predictable without a deliberate fibre and fluid plan.

What is the fastest relief for constipation on Ozempic? For immediate relief, speak to your pharmacist about a short-term option that suits you. For a fix that lasts, the fibre target, 2 litres of fluid, daily kiwifruit or prunes and a daily walk address the actual causes within a week or two.

Does Ozempic constipation go away on its own? Sometimes it eases as your body adjusts, but the underlying drivers (slower motility, less food, less fluid) remain while you take the medication, so most people need the deliberate plan rather than waiting it out.

Is it the medication or my diet? Both. The medication slows things; the shrunken diet removes bulk and water. You cannot change the first. You can completely change the second, which is why nutrition fixes most cases.

Becky May, Accredited Practising Dietitian (APD). This article is nutrition education and does not replace advice from your doctor or prescriber. Report persistent side effects to your doctor.