Why does Ozempic cause constipation?
Last updated September 3, 2026.
Ozempic causes constipation because semaglutide slows movement through the whole gut, and slower transit means drier, harder stool. The drug delays gastric emptying and dampens intestinal motility. Add a smaller food intake (less bulk to move) and any drop in fluid intake from nausea, and constipation follows. On the label, constipation was reported by 5.0% of patients on 0.5 mg and 3.1% on 1 mg, versus 1.5% on placebo, making it one of the five most common side effects alongside nausea, vomiting, diarrhea, and abdominal pain. It usually appears during dose increases and improves as your body adjusts. Day to day management is straightforward: drink more water, raise fiber gradually from vegetables, fruit, and whole grains, and move daily, since walking stimulates the bowel. A gentle osmotic laxative is a reasonable short-term backup to discuss with a pharmacist. Severe constipation lasting several days, or constipation with significant abdominal pain, bloating, or vomiting, deserves a call to your prescriber, especially if you have any history of slow stomach emptying or gastroparesis.
What to do
- Drink more water: slower transit pulls more water out of stool, so fluid intake is the first fix.
- Add fiber gradually: vegetables, fruit, and whole grains add bulk; ramp up slowly to avoid bloating.
- Move daily: even a 20-minute walk stimulates bowel motility.
- Keep meals smaller: large meals sit longer in a slowed stomach and worsen the whole GI picture.
- Call if severe: several days without a bowel movement, or constipation with significant pain, bloating, or vomiting, needs your prescriber.
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