GLP‑1 and constipation: why it happens and how to find relief

Introduction

Constipation can occur with semaglutide (Ozempic, Wegovy) or tirzepatide (Mounjaro, Zepbound). Ozempic and Mounjaro prescribing information list it among common side effects, but the duration and treatment you need can vary. 1 2 Start with a review of your symptoms and eating habits, and contact your prescriber if symptoms do not improve.

Constipation can last longer than other digestive symptoms

Researchers combined results from STEP 1, 2, and 3, which studied adults with overweight or obesity for 68 weeks. STEP 2 included people with type 2 diabetes. Participants took placebo or weekly semaglutide injections, with the dose increased over time to 2.4 mg. Constipation affected 24.2% of the semaglutide group and 11.1% of the placebo group. The median (middle) duration was 47 days with semaglutide and 35 days with placebo. These figures do not predict how long your symptoms will last. 3

Keep a brief record of bowel movements, hard stools, straining, and any remedies you try. Note whether the problem began before treatment or after a dose change so you can give your clinician a useful timeline.

Adjust food and fluids to your needs

Low fiber intake, inadequate fluids, and reduced activity can contribute to constipation. Other medicines, including iron supplements and some pain medicines, can also play a part. 4

• Add fiber in small steps: Try foods such as oats, beans, fruit, and vegetables in portions you tolerate.
• Pair fiber with fluids: Ask your care team how much fluid suits your health and activity. Follow any fluid restriction rather than a generic daily water target.
• Notice how you feel: If extra fiber worsens fullness or bloating, discuss an alternative plan instead of continuing to increase it. 5

Our GLP‑1 hydration guide can help you prepare questions about fluid intake. Record the targets your clinician recommends rather than choosing a universal fiber or water goal.

Choose a relief plan with your clinician

The AGA/ACG guideline strongly recommends polyethylene glycol (PEG) for adults with chronic idiopathic constipation, meaning ongoing constipation without an identified cause. It also supports trying psyllium, a fiber supplement, and using certain stimulant laxatives for a short time or occasional relief. This is general constipation evidence, not a direct GLP‑1 constipation trial. 6

Ask a pharmacist or clinician which option fits your symptoms, other medicines, and kidney function. Magnesium laxatives need particular caution with kidney disease. Do not combine products or adopt a daily laxative schedule without guidance; PEG and other laxatives can cause bloating or diarrhea. 6

If constipation continues, contact your prescriber before your next planned dose increase. Experts in GLP‑1 digestive side effects recommend that prescribers consider changing the schedule of dose increases when symptoms continue. 7

Warning signs need medical attention

Seek urgent medical care for severe or constant abdominal pain, vomiting, inability to pass gas, or blood in your stool. These symptoms need assessment before you try more fiber or laxatives. Contact your clinician if constipation does not improve with self-care, even without those warning signs. 4

Track symptoms with Shotsy

Use Shotsy’s symptom log and daily notes to record bowel changes alongside your injection dates. With Shotsy you can export a PDF that includes a side effects chart to see how your symptoms improve or worsen over time. Bring it to your appointment or send it to your provider, along with notes on what you tried and whether it helped.

Conclusion

You do not have to accept ongoing constipation as an unavoidable part of GLP‑1 treatment. Review food and fluid intake, ask about an appropriate relief plan, and contact your prescriber when symptoms persist or worsen.