{"id":635474,"date":"2026-03-10T09:30:54","date_gmt":"2026-03-10T13:30:54","guid":{"rendered":"https:\/\/www.singlecare.com\/blog\/?p=635474"},"modified":"2026-03-12T11:02:42","modified_gmt":"2026-03-12T15:02:42","slug":"does-amoxicillin-cause-constipation","status":"publish","type":"post","link":"https:\/\/www.singlecare.com\/blog\/does-amoxicillin-cause-constipation\/","title":{"rendered":"Does amoxicillin cause constipation?"},"content":{"rendered":"

Amoxicillin<\/span><\/a> is a widely prescribed antibiotic used to treat bacterial infections, including bronchitis, pneumonia, and infections of the ear, nose, and throat. It belongs to the penicillin class of antibiotics and is not effective against viruses, such as those that cause the common cold or flu.<\/span><\/p>\n

While stomach-related side effects can occur, constipation is not common. Amoxicillin is more likely to cause digestive symptoms such as diarrhea, nausea, or stomach discomfort.<\/span><\/p>\n\t\t

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Can amoxicillin cause constipation?<\/span><\/h2>\n

“Constipation can happen with amoxicillin, but it\u2019s much less common than diarrhea,” explains <\/span>Reshma Kapadia Patel, Pharm.D.<\/span><\/a>, founder of WiseMedRx. “Diarrhea is by far the more frequently reported digestive side effect because antibiotics disrupt normal gut bacteria.”<\/span><\/p>\n

“Constipation only affects a small minority of people who take amoxicillin,” says <\/span>Roberto Valledor, MD<\/span><\/a>, a family medicine provider based in Texas. “However, it\u2019s not unheard of, so you shouldn\u2019t ignore it if you have symptoms.”<\/span><\/p>\n

In the process of destroying the bacteria causing your infection, antibiotics also “temporarily reduce beneficial bacteria in the gut,” Dr. Kapadia Patel adds. “Those healthy bacteria play an important role in digestion, stool consistency, and intestinal motility.”<\/span><\/p>\n

Shifts in your gut microbiome can cause some people to experience looser stool, while others experience slowed gut motility, making bowel movements more difficult. “The response really depends on the individual\u2019s baseline microbiome, diet, and overall health,” Dr. Kapadia Patel explains. “In my experience, patients who already struggle with occasional constipation are more likely to notice a change.”<\/span><\/p>\n

Why else might you be constipated while taking amoxicillin?<\/span><\/h2>\n

While gut disruption is a common side effect of antibiotics, antibiotics are rarely the only cause of constipation during a bacterial illness. While antibiotics cause constipation in some cases, it is just as likely that changes to your usual diet and routine are the culprit of your constipation while taking <\/span>amoxicillin<\/span><\/a>. “It’s important to note that constipation during an illness is often multifactorial (less fluid, less fiber, less activity) and may not be solely the antibiotic,” Dr. Valledor notes<\/span><\/p>\n

Being sick usually means some temporary changes to your lifestyle and wellness routine, all of which could add up to your body not acting like its usual self.\u00a0<\/span><\/p>\n

Reduced appetite and lower fiber intake<\/span><\/h3>\n

When you are sick, you may eat less as illness affects your appetite. You may also be drawn to certain comfort foods that are low in fiber (crackers, broth, popsicles), which can slow your digestive system. Incorporating fiber-rich foods into your diet while you are taking antibiotics (and always) is a great way to avoid experiencing constipation.\u00a0<\/span><\/p>\n

Dehydration from fever or poor fluid intake<\/span><\/h3>\n

Being dehydrated can cause <\/span>constipation<\/span><\/a>, as water is necessary for fiber to do its job in the intestines, keeping stools soft and easier to pass. A lack of fluids can cause the colon to absorb the water in the stool, turning it from soft to hard.\u00a0<\/span><\/p>\n

Less physical activity<\/span><\/h3>\n

Keeping up with a regular fitness routine can help the colon contract, making waste move more effectively through the gastrointestinal system. This helps prevent constipation and address overall digestive health. When you are sick, you are less likely to stick to your exercise routine, which could contribute to constipation while taking amoxicillin.\u00a0<\/span><\/p>\n

Disrupted routines<\/span><\/h3>\n

If you’ve ever traveled for a vacation or work trip and noticed that your usual bathroom routine seems a bit off, that’s because of a disruption to your normal routine. A disrupted routine can be a reason for constipation, and being ill can certainly mess with your digestive schedule, as you may not be sleeping the same number of hours, waking at your usual time, or eating your usual diet. Your body is likely used to using the bathroom at certain points during your usual day, and if you are sick, your usual day is probably looking a bit different.\u00a0<\/span><\/p>\n

Stress<\/span><\/h3>\n

Being stressed can slow down the gut, which can easily lead to constipation. The body and mind can be in a state of stress when fighting off a virus or bacterial illness, and stress can cause changes in the digestive system, including constipation and an upset stomach.<\/span><\/p>\n

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