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Does Pepto-Bismol Cause Or Help Constipation?

In this article, we will take a close look at the relationship between Pepto-Bismol and constipation. We will discuss how this over-the-counter medication, commonly used to treat diarrhea and indigestion, can lead to constipation as a side effect. Additionally, we will provide strategies to prevent constipation when using Pepto-Bismol and discuss other potential side effects.

Jakub Gwiazdecki

Author - Jakub Gwiazdecki

Fifth year medical student at the Medical Faculty of Comenius University in Bratislava.

Jakub used MediSearch to find sources for this blog.
MediSearch gives instant answers to medical questions based on 30 million scientific articles.

Does Pepto-Bismol cause constipation?

Yes, as a side effect, Pepto-Bismol can cause constipation.

Pepto-Bismol is an over-the-counter medication containing bismuth subsalicylate. It is used to treat bloating and diarrhea [1, 2]. However, in some people, Pepto-Bismol can cause constipation.

Pepto-Bismol can lead to constipation owing to its ability to absorb water from the intestine. On one hand, Pepto-Bismol lowers the inflammation in the gut and helps with conditions like diarrhea [1, 2]. On the other hand, Pepto-Bismol can slow down the movement of stool through the intestines. This can lead to constipation in some people.

Does Pepto-Bismol help with constipation?

No, Pepto-Bismol does not help with constipation. In fact, it can do the opposite - Pepto-Bismol can lead to constipation as a side effect. Thus, its use in constipation can worsen the condition.

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Pepto-Bismol is a popular over-the-counter medication primarily used to treat diarrhea and indigestion [2]. It is not used for the treatment of constipation.

Is it possible to prevent Pepto-Bismol from causing constipation?

Some general strategies can help prevent constipation when taking Pepto-Bismol.

One general preventive measure to prevent constipation from Pepto-Bismol is a fiber-rich diet. Eat around 14 grams of fiber per thousand calories [3]. It can help with stool passing and to avoid constipation. A fiber diet should contain whole grain products, fruits, and vegetables [4, 3].

Another key strategy to prevent constipation from Pepto-Bismol is staying hydrated. Drinking enough water makes the stool softer and bulkier [5]. It can reduce the risk of constipation when taking Pepto-Bismol.

Also, avoid drinking caffeine or alcohol, as they lead to dehydration [4]. It increases the risk of constipation.

Physical activity is another crucial factor in preventing constipation when taking Pepto-Bismol. One of the benefits of exercising is the support of bowel movements [5, 3]. It helps with stool passing.

Additionally, the consumption of probiotics can be helpful. Adding two grams of kefir to every meal for three months can significantly reduce the risk of constipation [6].

What are the side effects of Pepto-Bismol, and when should you see a doctor?

Pepto-Bismol, like any medication, also has side effects. It can cause:

  • nausea,
  • vomiting,
  • constipation,
  • black stool,
  • black and “hairy” tongue [1, 2].

In rare cases, Pepto-Bismol can lead to ringing in the ears, which can be a sign of overdose. You should seek medical attention when you experience ear ringing after Pepto-Bismol [7].

Also, when you experience vomiting, nausea, or constipation, you should stop taking Pepto-Bismol and see a doctor [2].

The black stool as a side effect of Pepto-Bismol is common. It is caused by the bismuth, which is the active substance of Pepto-Bismol. In the digestive system, bismuth connects with sulfur from the food and forms bismuth sulfide. This compound is black and can color the stool [2].

The bismuth sulfide also has a similar effect on the tongue. It causes the black color of the tongue and the buildup of dead cells. These dead cells give a hairy look to the tongue. The tongue changes disappear within a few days after stopping Pepto-Bismol [2].

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