Does metamucil work for diarrhea?

What is Diarrhea?

Diarrhea is a common digestive problem that affects people of all ages, and it is characterized by the frequent and watery bowel movement. Acute diarrhea typically lasts for a few days, while chronic diarrhea can last for several weeks or even longer. This condition can cause dehydration, electrolyte imbalance, and other complications, particularly in children, elderly adults, and people with weakened immune systems.

Can Metamucil Help with Diarrhea?

How Does Metamucil Work?

Metamucil is a brand of psyllium fiber supplement that is usually taken to improve regularity and relieve constipation. Psyllium absorbs water in the intestines and forms a gel-like substance that can help to soften stools and ease their passage through the digestive tract. This effect can help to alleviate constipation and promote regular bowel movements.

Can Metamucil Treat Diarrhea?

Although Metamucil is typically used to treat constipation, some people may wonder if it can also be beneficial for diarrhea. However, the answer to this question is not straightforward.

While Metamucil’s main benefit is to bulk up the stool and absorb water in the intestines, it may actually exacerbate diarrhea symptoms in some individuals. This is because, in some cases, the fibers in Metamucil can increase the volume and frequency of bowel movements, resulting in a greater loss of water and electrolytes through the stool.

Therefore, it is recommended that people with diarrhea should avoid taking Metamucil, particularly if their diarrhea is severe, or if they have any other symptoms or conditions that require medical attention.

Other Treatments for Diarrhea


Hydration is a crucial part of treating diarrhea, as it can help to replenish the fluids and electrolytes that are lost as a result of frequent bowel movements. Drinking plenty of water, clear broths, and fruit juices can help to prevent dehydration and maintain proper hydration levels. Avoiding alcohol, caffeine, and sugary drinks is essential, as they can worsen diarrhea by irritating the stomach and increasing fluid loss.

Dietary Changes

Dietary changes are also recommended for people with diarrhea, as certain foods and drinks can exacerbate symptoms or trigger diarrhea in some individuals. People with diarrhea should avoid high-fiber foods, spicy or fatty foods, dairy products, large meals, and any other foods that irritate the stomach or intestines. Instead, they should focus on consuming bland, low-fiber foods that are easy to digest, such as rice, bananas, applesauce, and toast.

Over-the-Counter Medications

Various over-the-counter (OTC) medications can help to alleviate diarrhea symptoms, such as loperamide, bismuth subsalicylate, and probiotics. Loperamide is an anti-diarrheal medication that reduces the frequency and volume of bowel movements, while bismuth subsalicylate can help to coat and soothe the stomach and intestines. Probiotics can also be helpful, as they introduce beneficial bacteria into the gut and improve digestive health.

When to Seek Medical Attention

While most cases of diarrhea can be treated at home with self-care measures, some cases may require medical attention. People with severe diarrhea, bloody stools, persistent vomiting, fever, and signs of dehydration should seek medical attention immediately. In addition, people with weakened immune systems, chronic medical conditions, or recent travel to high-risk areas may also require medical attention to diagnose and treat the underlying cause of diarrhea.


In conclusion, while Metamucil may be effective for relieving constipation, it is not recommended for treating diarrhea. People with diarrhea should focus on staying hydrated, making dietary changes, and taking OTC medications as needed. If symptoms persist or worsen, seeking medical attention is essential to prevent dehydration and other complications.


  • Mayo Clinic. (2021). Diarrhea. Retrieved from
  • National Institute of Diabetes and Digestive and Kidney Diseases. (2017). Diarrhea. Retrieved from
  • UpToDate. (2021). Patient education: Acute diarrhea in adults (Beyond the Basics). Retrieved from

Frequently Asked Questions About Metamucil and Diarrhea

  • Can Metamucil cause diarrhea?

    While Metamucil is not intended to treat diarrhea, some people may experience diarrhea-like symptoms if they take too much of it or do not drink enough water with it. If you experience diarrhea or other adverse side effects while taking Metamucil, discontinue use and consult your healthcare provider.

  • Can Metamucil help with loose stools?

    Metamucil is generally used to treat constipation by bulking up the stool and improving regularity. While it may help to soften stools in some cases, it is not recommended for treating loose stools or diarrhea, as it can exacerbate symptoms in some individuals.

  • Can Metamucil help with IBS-related diarrhea?

    While some people with irritable bowel syndrome (IBS) may benefit from taking Metamucil to regulate their bowel movements, it is not recommended for treating IBS-related diarrhea, as it can worsen symptoms in some individuals. People with IBS should consult their healthcare provider to determine the best course of treatment for their specific symptoms and situation.

  • Is Metamucil safe for people with diarrhea?

    Metamucil is generally safe for most people, but it is not recommended for treating diarrhea, particularly if symptoms are severe or accompanied by other symptoms or conditions that require medical attention. People with diarrhea should consult their healthcare provider before taking any fiber supplements or medications.