Does Zepbound Cause Constipation?
Yes, constipation is a common side effect of Zepbound (tirzepatide), reported in clinical trials and post-approval data. In the SURMOUNT-1 trial, 7% of patients on the 5 mg dose, 7% on 10 mg, and 6% on 15 mg experienced constipation, compared to 1% on placebo.[1] It's listed as a frequent gastrointestinal issue, often mild to moderate, affecting up to 20% of users across doses in broader safety data.[2]
How Common Is It Compared to Other Side Effects?
Constipation ranks below nausea (up to 36% incidence), diarrhea (23%), and vomiting (13%) but ahead of rarer effects like abdominal pain. It typically starts early in treatment and may lessen over time.[1][3] Women and those on higher doses report it more often.
Why Does Zepbound Cause Constipation?
Tirzepatide mimics GLP-1 and GIP hormones, slowing gastric emptying and intestinal motility to regulate blood sugar and appetite. This delay can harden stools and reduce bowel movements, similar to other GLP-1 drugs like Ozempic or Mounjaro.[4]
How Long Does Constipation Last?
Most cases resolve within weeks as the body adjusts, but it can persist for months in 5-10% of users. Starting at lower doses (2.5 mg) and titrating slowly reduces risk.[3][5]
What Happens If You Get Constipation on Zepbound?
Mild cases often need no intervention, but severe or ongoing constipation risks complications like fecal impaction. Stop the drug and seek medical help if accompanied by severe pain, bloating, or blood in stool.[2] Over-the-counter remedies like stool softeners or laxatives are commonly recommended, but check with a doctor first.
How to Manage or Prevent It
- Increase fiber (25-30g daily from fruits, veggies, whole grains) and water intake (at least 64 oz daily).
- Add exercise like walking to stimulate bowels.
- Use magnesium supplements, Miralax, or prunes; avoid stimulant laxatives long-term.
- If persistent, doctors may pause dosing or switch medications.[3][5]
Does It Differ from Wegovy or Mounjaro?
Zepbound's constipation rate (6-7%) is similar to Mounjaro (also tirzepatide, ~7%) but slightly higher than Wegovy (semaglutide, ~5%). Dual GLP-1/GIP action may intensify motility effects versus single-agonist drugs.[1][4]
When to Worry or Stop Zepbound
Contact a doctor if constipation lasts over a week despite remedies, or if you have bowel obstruction signs (no stools for 3+ days, vomiting). It's rarely a reason to discontinue alone, with <1% dropout rate in trials due to it.[1][2] No link to serious long-term bowel damage in data so far.
Sources:
[1] Zepbound Prescribing Information (FDA)
[2] SURMOUNT Clinical Trial Results (NEJM)
[3] Eli Lilly Safety Profile
[4] GLP-1 GI Side Effects Review (Diabetes Care)
[5] Mayo Clinic Zepbound Management