Why am I constipated on a GLP-1, and what helps?
The short answer: Constipation is extremely common on GLP-1s — slower digestion plus eating less is the cause, and it's very manageable. This is one of the most common GLP-1 side effects.
Why it happens
Two things stack up: the medication slows how fast everything moves through your gut, and you're simply eating less, so there's less bulk and less fiber going in. Add the dehydration that comes with a smaller appetite and stool gets slow and hard.
It's most likely in the first weeks and after dose increases.
How long it lasts
It often improves as your body adapts, but for many people it's an ongoing thing to manage with fiber, fluids, and movement rather than something that fully disappears.
What helps
- Drink more water than feels necessary — aim for pale-yellow urine
- Get fiber in deliberately (vegetables, fruit, whole grains, or a fiber supplement)
- Move daily — even a 10–15 minute walk helps your gut
- Ask your prescriber about a gentle stool softener or magnesium if it persists
When to call your doctor
- No bowel movement for several days with belly pain, bloating, and vomiting
- Severe or worsening abdominal pain
Track this against your dose. Logging constipation week by week shows whether it's actually easing — and gives your prescriber real data.
Related symptoms
Educational information from Calqulate.net — not medical advice, diagnosis, or treatment. Follow your prescriber's instructions and contact a licensed clinician about your symptoms.
