Diarrhea on GLP-1s: When It's Normal and When It's Not

GLP-1 medications (semaglutide, tirzepatide, liraglutide, dulaglutide — Ozempic, Wegovy, Mounjaro, Zepbound, Trulicity, Saxenda, Rybelsus) mimic a natural hormone that controls blood sugar and appetite. Stomach and intestinal side effects are the most common effects of these drugs.[1]

Why Diarrhea Happens

Diarrhea affects roughly 1 in 4 to 1 in 3 people taking these medications.[2] The good news is that it's usually:

• Mild to moderate[3][1]
• Most common during the first few weeks or after a dose increase[2]
• Temporary — it tends to improve as your body adjusts[1]

Dietary Changes

• Eat smaller, more frequent meals — 4 to 6 small meals instead of 2 or 3 large ones.[2][4]
• Avoid high-fat and greasy foods, which can make diarrhea worse.[2][4]
• Avoid high-sugar foods and drinks, which can worsen loose stools.[4]
• Limit or avoid alcohol, which can irritate your stomach and intestines.[2]
• Try bland, easy-to-digest foods — bananas, rice, applesauce, toast, plain crackers, boiled potatoes.
• Eat slowly and stop when full — pushing past fullness can trigger stomach upset.[3]

Stay Hydrated

• Drink plenty of fluids — water, broth, and electrolyte drinks (Pedialyte or diluted sports drinks) are good choices.[4][3]
• Sip throughout the day rather than drinking large amounts at once.
• Diarrhea can cause dehydration, which in rare cases can affect your kidneys. Staying well hydrated is very important.[3]

Over-the-Counter Remedies

• Fiber supplements (psyllium/Metamucil) can add bulk to your stool and reduce loose bowel movements.[2]
• Anti-diarrheal medications (loperamide/Imodium) can give short-term relief for bothersome episodes. Use as directed.[2][3]

When to Call Your Doctor

Contact your provider if you experience:

• Diarrhea that lasts more than a few days or is getting worse
• Severe or watery diarrhea happening many times a day
• Signs of dehydration: very thirsty, dark urine, dizziness, lightheadedness, or dry mouth
• Blood in your stool
• Severe stomach pain
• Fever along with diarrhea
• Being unable to keep fluids down due to vomiting along with diarrhea

Tips at a Glance

Do	Don't
Eat small, frequent meals	Eat large or heavy meals
Choose bland, low-fat foods	Eat greasy, fried, or spicy foods
Drink fluids throughout the day	Wait until you're very thirsty to drink
Use fiber supplements for loose stools	Ignore diarrhea lasting more than a few days
Call your doctor if symptoms are severe	Stop your medication without talking to your doctor

Important Reminders

• Do not stop your medication on your own. If side effects bother you, talk to your doctor — they may slow your dose increase, temporarily lower your dose, or prescribe something to help.[2][3]
• Gradual dose increases help. Your doctor raises your dose slowly on purpose — this gives your body time to adjust and reduces side effects.[2]
• Side effects usually improve. Most people find diarrhea and other stomach symptoms get better within a few weeks on a stable dose.[5][1]
• Keep all follow-up appointments so your doctor can monitor you and adjust treatment if needed.