How do I relieve constipation on Zepbound or Wegovy?
On tirzepatide (Zepbound) or semaglutide (Wegovy), US guidance puts more fluids and fiber from food, such as prunes, first. If that isn’t enough, US gut specialists strongly recommend the laxative polyethylene glycol for long-term constipation in general. In US label trials, 11% to 17% had constipation on Zepbound vs 5% on placebo, and 24% on Wegovy vs 11% on placebo.
- GLP‑1 medicines are prescription-only in the US.
- Side-effect rates come from each medicine’s US prescribing information, named each time.
- Laxatives are named by their generic names only. We don’t rank products.
How common is constipation on Zepbound and Wegovy?
About 1 in 6 people on Zepbound 5 mg and 1 in 4 on Wegovy 2.4 mg had constipation in the US label trials.1,2
On Zepbound (tirzepatide), rates were 17% at 5 mg, 14% at 10 mg and 11% at 15 mg. On placebo (a dummy injection), it was 5%. The label counts hard stools as constipation too.1 On Wegovy (semaglutide) 2.4 mg it was 24% vs 11%. In the 7.2 mg trial, it was 20% on 7.2 mg, 19% on 2.4 mg and 8% on placebo.2
It also lasts longer than other stomach side effects. In the semaglutide trials, a typical bout lasted 47 days, vs 35 on placebo. Constipation stayed more common than on placebo for all 68 weeks.3 Constipation means fewer than 3 bowel movements a week, or stools that are hard, dry, lumpy or painful to pass.7 Other side effects are in Guide 5.
What helps, according to US guidance?
A US nutrition advisory for people on GLP‑1s puts fluids and fiber from food first, added gradually, with prunes or other dried fruit as examples.4
The NIH advises adults to get 22 to 34 grams of fiber a day, depending on age and sex.8 A small US trial tested 2 kiwifruit a day or about 3.5 oz (100 g) of prunes a day. Both eased straining over 4 weeks, in people with long-term constipation who weren’t on GLP‑1s.6 The NIH also lists regular physical activity as a way to ease constipation.8
If food isn’t enough, the advisory lists magnesium, fiber supplements, polyethylene glycol and stool softeners.4 The US gastroenterology guideline for long-term constipation strongly recommends polyethylene glycol. It covers long-term constipation with no known cause, not constipation caused by a medicine like a GLP‑1. In its trials, the effect held over 6 months. Side effects include bloating, loose stools and gas. Psyllium was the one fiber supplement it found effective, taken with plenty of fluid.5 Polyethylene glycol can take 2 to 4 days to work.12 The NIH drug page says not to take it for longer than your doctor tells you to.12
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When is constipation on a GLP‑1 dangerous?
Both US labels list a blocked bowel (intestinal obstruction), a stalled bowel (ileus) and stuck, hardened stool (fecal impaction) among problems reported since approval.1,2
Those reports are voluntary, so the labels say their frequency and cause can’t always be pinned down.1,2 Severe stomach and gut side effects of any kind affected 1.7% to 3.1% on Zepbound (1% on placebo). On Wegovy it was 4.1% (0.9% on placebo).1,2
Both Medication Guides say to tell your healthcare provider about stomach problems that are severe or won’t go away.1,2 For other emergencies, see When should I call 911 on a GLP‑1?
What do people on Zepbound and Wegovy report about constipation?
From public patient forums: 10 Reddit threads in r/Zepbound, r/Wegovy, r/Semaglutide, r/Ozempic and r/MounjaroUK, read in October 2026. Personal reports, not medical evidence.
What people describe
- Matches the label Several say it began in the first weeks or after a dose increase, and a few say months in. The Wegovy label says stomach side effects were most often reported during dose increases. In the semaglutide trials, constipation stayed above placebo for all 68 weeks.2,3
- Matches the label Several describe stool so hard it got stuck, and a few needed emergency care for it. Both US labels list fecal impaction among reported problems.1,2
- Matches the US advisory A few had watery stool while still badly blocked. The US advisory notes that long constipation “can also lead to reactive diarrhea.”4
- Matches the US advisory Several say the anti-nausea medicine ondansetron made it worse. The same advisory says ondansetron can worsen constipation.4
Advice people share
- Matches the US guideline Most begin with more water and fiber, added slowly; many eat prunes or 2 kiwifruit a day, and many take polyethylene glycol or magnesium daily. US guidance and a small US trial back these. The guideline strongly backs polyethylene glycol and weakly backs magnesium oxide, but not with kidney problems.4,5,6
- Not studied Most replies in threads about blockages say not to let it run past a few days. We found no US guidance that sets a number of days; the NIH says to see a doctor if self-care doesn’t work.7
- Label says otherwise Some take stimulant laxatives such as senna every day for weeks. The NIH drug page says no more than 1 week without a doctor, as frequent use may cause dependence.11
- Label says otherwise A few skip or put off GLP‑1 doses on their own to ease it. The US labels make dose changes the prescriber’s call: a slower dose step on Wegovy, or a lower dose on Zepbound.1,2
Contact your prescriber or a doctor right away if you can’t pass any gas, your belly stays swollen, or you have blood in your stool or from your rectum, or a fever.7,9
Read the full picture
Related questions
Sources
- Eli Lilly. Zepbound (tirzepatide) US prescribing information, revised 08/2026, and Medication Guide, revised 04/2026. US label. FDA PDF
- Novo Nordisk. Wegovy (semaglutide) injection and tablets, US prescribing information and Medication Guide, revised 06/2026. US label. novo-pi.com
- Wharton S et al. Gastrointestinal tolerability of once-weekly semaglutide 2.4 mg in adults with overweight or obesity (STEP 1–4). Diabetes, Obesity and Metabolism 2022;24:94–105. Trials funded by Novo Nordisk. PMC
- Mozaffarian D et al. Nutritional priorities to support GLP-1 therapy for obesity: a joint advisory (ACLM, ASN, OMA, The Obesity Society). American Journal of Clinical Nutrition 2025;122:344–367. Several authors declare advisory or speaker roles with Novo Nordisk or Eli Lilly (paper’s own declaration). PMC
- Chang L et al. AGA–ACG clinical practice guideline: pharmacological management of chronic idiopathic constipation. Gastroenterology 2023;164:1086–1106. Funded by the two societies, no industry support; authors declare ties to laxative makers. PMC
- Chey SW et al. Exploratory comparative effectiveness trial of green kiwifruit, psyllium, or prunes in US patients with chronic constipation. American Journal of Gastroenterology 2021;116:1304–1312. 79 adults, 4 weeks. doi:10.14309/ajg.0000000000001149
- National Institute of Diabetes and Digestive and Kidney Diseases (NIH). Symptoms and causes of constipation. Last reviewed May 2018. niddk.nih.gov
- National Institute of Diabetes and Digestive and Kidney Diseases (NIH). Treatment for constipation. Last reviewed May 2018. niddk.nih.gov
- MedlinePlus (US National Library of Medicine). Intestinal obstruction. Reviewed Apr 27, 2026. medlineplus.gov
- MedlinePlus (US National Library of Medicine). Recognizing medical emergencies (warning signs from the American College of Emergency Physicians). Reviewed Jan 8, 2025. medlineplus.gov
- MedlinePlus (US National Library of Medicine). Senna. Last revised Jun 20, 2024. medlineplus.gov
- MedlinePlus (US National Library of Medicine). Polyethylene glycol 3350. Last revised Mar 15, 2016. medlineplus.gov
Last checked Oct 19, 2026 · Next review due Oct 19, 2027 · Report an error
How this answer was made. Written by the GLP Guidebook team from the sources above, all checked on Oct 19, 2026. The “What people report” section summarizes public patient forum posts we read; it is not medical evidence, and we never pass on advice that goes against the label. It’s general information, not medical advice. Talk to a doctor, pharmacist or other licensed prescriber before starting, stopping or changing any medicine. In an emergency, call 911. How we write