Does Zepbound cause constipation?
Yes. Zepbound is tirzepatide, and tirzepatide slows stomach emptying and gut transit — its label states this directly. Slower transit means stool sits longer in the colon, more water is reabsorbed, and it turns hard and infrequent. Eating and drinking less on the drug compounds it.
In the trials, constipation was reported in 17% at the 5 mg dose, 14% at 10 mg and 11% at 15 mg — highest at the LOW dose — versus 5% on placebo.
When it starts and whether it fades
It usually appears in the first weeks and again after each dose increase. The label notes GI reactions are worst during dose escalation and ease over time — but constipation tends to be more stubborn than nausea, because the slowed motility does not fully adapt away.
What actually helps
- Fluids, soluble fiber (psyllium) and movement are the reasonable first step — but if your gut is very slow, a lot of fiber can worsen bloating, so it is not always the right first move.
- The best-evidenced next step is an osmotic laxative: polyethylene glycol (PEG 3350, MiraLAX) is first-line in gastroenterology guidance for chronic constipation. Magnesium osmotics work too, but avoid them with kidney problems.
- Stimulant laxatives (senna, bisacodyl) are a short-term rescue, not a daily plan.
These management steps are general gastroenterology practice, not instructions from the Zepboundlabel — there is no tirzepatide-specific management guideline. Run any laxative, anti-diarrheal or supplement past your prescriber or pharmacist, especially alongside other medications.
When it is an emergency, not a side effect to manage
No bowel movement combined with vomiting and a distended, swollen abdomen can mean a bowel obstruction or ileus — the label lists ileus as a reported reaction, and this combination is an emergency, not something to wait out. Severe pain radiating to your back can signal pancreatitis. Either warrants urgent care.
For the full picture across the class, see GLP-1 constipation and the complete Zepbound side-effect list.