Side Effects & Support
GLP-1 Constipation: A Complete Guide to Relief
Published July 20, 2026
Constipation is one of the most common GLP-1 side effects — and one of the most fixable once you understand why it happens. Here’s a complete, step-by-step approach to relief, plus the signs that mean it’s time to call your prescriber.
Why it happens
Two forces combine:
- Slowed gut motility. GLP-1s deliberately slow how fast food moves through your digestive system. Slower transit means stool spends more time in your colon, where more water gets absorbed out of it — making it harder and drier.
- Less input. You’re eating much less, which means less food volume, less fiber, and often less fluid — all of which your gut needs to keep things moving.
Slower engine plus less fuel equals constipation. Very common, and usually not a sign anything is wrong.
The step-by-step relief plan
Work through these in order — they build on each other:
1. Fluids first
This is the most underrated fix. Appetite loss quietly drops your fluid intake, and dehydration is half the problem. Sip water steadily through the day; a low-tech gauge is aiming for pale-yellow urine. Adding electrolytes helps too.
2. Fiber, added gradually
Fiber gives stool bulk and helps it move — but add it slowly and with water, or you’ll trade constipation for bloating:
- Food fiber: vegetables, fruit, beans, chia seeds, oats
- Supplement fiber: psyllium husk is cheap and well-studied — start with a small dose and build up
3. Move your body
A daily walk is genuinely functional here, not just general wellness advice — movement stimulates the gut. Even 10–15 minutes helps.
4. Magnesium
Magnesium has a mild role in relieving constipation (it’s the active ingredient in some common remedies). Glycinate or citrate forms are typical picks — and it’s a reasonable addition for many people, though check with your clinician first if you have kidney issues or take other medications.
5. Talk to your prescriber before escalating
If the basics aren’t working after a few days, ask your prescriber before reaching for stimulant laxatives or stacking over-the-counter products. They can recommend a safe approach — self-treating aggressively can backfire on a slowed gut.
The red flags: when to call promptly
Most GLP-1 constipation is an annoyance. But contact your prescriber right away if you have:
- Severe abdominal pain
- Vomiting
- No passing of gas or stool at all
- A hard, swollen, distended belly
Those can signal a more serious blockage (bowel obstruction), which is a medical issue — not something to manage with more fiber. This is the line between “uncomfortable” and “needs a doctor now.”
The bottom line
GLP-1 constipation comes from a slower gut plus less food and fluid — and it responds to a simple, ordered approach: hydrate first, add fiber gradually, move daily, consider magnesium, and loop in your prescriber before escalating to strong laxatives. Know the red flags, and don’t tough out severe pain or a rigid, swollen belly — that’s a same-day call. For the rest of the side-effect playbook, see our week-by-week guide.
Frequently asked questions
Why does Ozempic or Wegovy cause constipation?
Two reasons stack up: GLP-1s slow how fast things move through your gut, and you're eating much less — which means less food, less fiber, and often less fluid. Slower transit plus less input is a recipe for constipation. It's very common and usually manageable.
What's the fastest way to relieve GLP-1 constipation?
Start with fluids (you're likely under-hydrated), add fiber gradually (psyllium is well-studied), get moving with a daily walk, and consider magnesium. If several days pass with no relief, ask your prescriber before reaching for stronger laxatives — don't stack over-the-counter products on your own.
Should I take a fiber supplement?
Fiber like psyllium can help, but add it slowly and with plenty of water — too much too fast can trade constipation for bloating and gas. Food fiber (vegetables, chia, beans) counts too. Build up gradually rather than dumping in a big dose.
When should I see a doctor about constipation?
If it lasts more than a few days despite the basics, or comes with severe abdominal pain, vomiting, no gas passing, or a hard, distended belly, contact your prescriber promptly — those can signal a more serious blockage. Don't white-knuckle it or self-treat aggressively.
Sources & further reading
This article draws on peer-reviewed research and official health agencies. We link to primary sources so you can read the evidence yourself.
- 1.Semaglutide (subcutaneous route): description, side effects & dosage — Mayo Clinic
- 2.WEGOVY (semaglutide) — Highlights of Prescribing Information — U.S. Food & Drug Administration
Written by Max, founder of Well Basecamp — see our editorial policy for how we source and verify what we publish.