The drinks most likely to ease constipation quickly are senna tea, prune juice, kiwifruit juice, kombucha and a moderate cup of coffee, according to Cleveland Clinic dietitians and Dr. Carolyn Newberry, a gastroenterologist who directs the Gastrointestinal Nutrition Program at Weill Cornell Medicine. Each one works differently, and each comes with a catch tied to dose, timing or hydration.
Constipation ranks among the most common digestive complaints in the U.S., according to the Cleveland Clinic. The usual cause is too little fiber, and fiber only works when enough fluid moves with it. Cleveland Clinic dietitian Beth Czerwony recommends 25 to 35 grams of fiber a day from whole grains, along with about five combined servings of fruits and vegetables.
Those five drinks have earned their reputation. But the drink with some of the strongest new research behind it is not on that list, and most people pour it without a second thought.
Which drink works fastest for constipation?
Senna tea is the closest thing to medicine in a mug. Senna is a plant with a natural laxative effect and is sold over the counter as a constipation remedy for most people 2 and older. Use is limited to about a week. People with gastrointestinal conditions should avoid it, and anyone who is pregnant should check with a doctor first. Czerwony adds that warm drinks of any kind can help wake up a sluggish gut.
Coffee comes next for speed. It signals the body to release gastrin and cholecystokinin, two digestive hormones that can send you to the bathroom, Czerwony says. Newberry urges restraint because coffee acts as a diuretic, and overdoing it can leave you drier and more backed up than before.
Is prune juice really better than other juices?
Newberry calls prunes a simple and reliable fix, and the benefit may reach past fiber. A 2022 study in the journal Food & Function found prunes improved the gut microbiome and lowered markers of inflammation.
There is a nuance worth knowing, though. New guidelines from the British Dietetic Association found that prunes did not outperform psyllium fiber supplements, although the evidence on that point was rated very low. The prune juice your grandmother swore by still holds up. It just is not magic.
What about kiwi juice and kombucha?
The natural sugar in fruit juice can prompt a bowel movement, Newberry says, and kiwifruit is her favorite. A 2022 review in Nutrients found strong evidence that kiwifruit relieves constipation and supports healthy gut bacteria. The European Food Safety Authority also recognizes kiwifruit as supporting normal bowel function.
Here is the detail most people miss. The British guidelines recommend the whole fruit eaten without its skin, and kiwifruit supplements showed no effect on stool frequency or consistency. Blending the whole fruit keeps more of its fiber than juicing it.
Kombucha may help by supporting healthier gut bacteria, Czerwony says. Newberry warns that many bottles contain added sugar, artificial sweeteners or caffeine, any of which can upset the bowels. Read the label first.
When is constipation a sign of something bigger?
Stress, travel and poor sleep commonly cause an occasional slow day, Newberry says. Constipation that keeps coming back is different. Research published in 2024 in Gut Microbes linked deeper gut problems to a higher risk of chronic and inflammatory disease.
David Gardinier, a Cleveland Clinic dietitian, says other warning signs include undigested food in stool, diarrhea, bloating, belly pain, nausea or vomiting, and nutrient shortfalls despite eating normally. There is no validated test for a healthy microbiome. A gastroenterologist can order stool tests, a colonoscopy or screenings for malabsorption.
Czerwony says to see a doctor if constipation lasts longer than three weeks or comes with pain, nausea or vomiting. The same goes for blood in the stool or a family history of colon or rectal cancer.
That last point carries extra weight in Black communities. Black Americans have some of the highest rates of colorectal cancer diagnoses and deaths in the country. Chadwick Boseman’s death from colon cancer at 43 put that reality in front of millions. Screening is now recommended starting at age 45 for adults at average risk. Blood in the stool is not something to wait out.
What is the overlooked drink for constipation?
It is water, but a specific kind. The British Dietetic Association released what it calls the first evidence-based dietary guidelines for chronic constipation, drawing on 75 randomized trials. Water high in minerals raised the chance of a meaningful improvement by 47% compared with low-mineral water. The guidelines suggest drinking 0.5 to 1.5 liters a day alongside other treatments.
Magnesium is a big part of why it works. The waters used in research held 105 to 1,000 milligrams of magnesium per liter. British tap water contains about 32 milligrams per liter at most. Check the label for magnesium before buying, and talk to a doctor first if you have kidney problems.
The fix might not be the strongest drink on the shelf. It might be the plainest one.
This article is for general information and is not a substitute for medical advice.
