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

> Diarrhea affects roughly 1 in 4 to 1 in 3 people on GLP-1s and is usually mild, most common in the first weeks or after a dose increase, and temporary. Manage it with small, frequent, bland low-fat meals (bananas, rice, applesauce, toast), avoiding greasy, sugary, and alcoholic items, and staying hydrated. Fiber supplements or loperamide (Imodium) can help short-term. Call your doctor for diarrhea lasting more than a few days, blood in stool, fever, severe pain, or dehydration.

![Microscopic cross-section illustration of intestinal villi, the finger-like projections lining the small intestine that absorb nutrients and water.](https://tryimbue.com/images/learn/intestinal-villi-cross-section.jpg)

Canonical: https://tryimbue.com/learn/diarrhea-on-glp1s
Last clinically reviewed: 2026-07-21 by Dr. Prajeet Reddy, MD (Medical Director, Cyane Medical Group California PC)

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]](https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD015092.pub2/full)

## Why Diarrhea Happens

Diarrhea affects roughly 1 in 4 to 1 in 3 people taking these medications.[[2]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0) The good news is that it's usually:

- Mild to moderate[[3]](https://doi.org/10.1097/HEP.0000000000001608)[[1]](https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD015092.pub2/full)
- Most common during the first few weeks or after a dose increase[[2]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)
- Temporary — it tends to improve as your body adjusts[[1]](https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD015092.pub2/full)

## Dietary Changes

- **Eat smaller, more frequent meals** — 4 to 6 small meals instead of 2 or 3 large ones.[[2]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)[[4]](https://pubmed.ncbi.nlm.nih.gov/41324524)
- **Avoid high-fat and greasy foods**, which can make diarrhea worse.[[2]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)[[4]](https://pubmed.ncbi.nlm.nih.gov/41324524)
- **Avoid high-sugar foods and drinks**, which can worsen loose stools.[[4]](https://pubmed.ncbi.nlm.nih.gov/41324524)
- **Limit or avoid alcohol**, which can irritate your stomach and intestines.[[2]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)
- **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]](https://doi.org/10.1097/HEP.0000000000001608)

## Stay Hydrated

- **Drink plenty of fluids** — water, broth, and electrolyte drinks (Pedialyte or diluted sports drinks) are good choices.[[4]](https://pubmed.ncbi.nlm.nih.gov/41324524)[[3]](https://doi.org/10.1097/HEP.0000000000001608)
- **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]](https://doi.org/10.1097/HEP.0000000000001608)

## Over-the-Counter Remedies

- **Fiber supplements** (psyllium/Metamucil) can add bulk to your stool and reduce loose bowel movements.[[2]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)
- **Anti-diarrheal medications** (loperamide/Imodium) can give short-term relief for bothersome episodes. Use as directed.[[2]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)[[3]](https://doi.org/10.1097/HEP.0000000000001608)

## 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]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)[[3]](https://doi.org/10.1097/HEP.0000000000001608)
- **Gradual dose increases help.** Your doctor raises your dose slowly on purpose — this gives your body time to adjust and reduces side effects.[[2]](https://linkinghub.elsevier.com/retrieve/pii/S0002-9165(25)00240-0)
- **Side effects usually improve.** Most people find diarrhea and other stomach symptoms get better within a few weeks on a stable dose.[[5]](https://pubmed.ncbi.nlm.nih.gov/36614945)[[1]](https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD015092.pub2/full)
- **Keep all follow-up appointments** so your doctor can monitor you and adjust treatment if needed.

## Frequently asked questions

### Is diarrhea normal when starting a GLP-1?

Yes — GI side effects are the most common effects of GLP-1s, and diarrhea affects roughly 1 in 4 to 1 in 3 people. It's usually mild to moderate, most common during the first few weeks or after a dose increase, and tends to improve as your body adjusts to the medication.

### What should I eat if I have diarrhea on a GLP-1?

Choose small, frequent, bland, low-fat meals — bananas, rice, applesauce, toast, plain crackers, boiled potatoes. Avoid high-fat, greasy, sugary, and spicy foods and alcohol, which can worsen loose stools. Eat slowly and stop when full. Stay hydrated with water, broth, and electrolyte drinks sipped throughout the day.

### Can I take Imodium for GLP-1 diarrhea?

Anti-diarrheal medications like loperamide (Imodium) can give short-term relief for bothersome episodes — use as directed on the package. Fiber supplements such as psyllium (Metamucil) can add bulk and reduce loose stools. Check with your provider, especially if diarrhea is frequent or persistent.

### When is diarrhea on a GLP-1 a warning sign?

Call your provider for diarrhea lasting more than a few days or getting worse; severe or watery diarrhea many times a day; blood in your stool; severe stomach pain; fever with diarrhea; signs of dehydration (very thirsty, dark urine, dizziness, dry mouth); or being unable to keep fluids down because of vomiting alongside diarrhea. Don't stop your medication on your own.