Prune juice is the single most effective drink for constipation, but it’s far from your only option. Several beverages can get things moving through different mechanisms: pulling water into your intestines, stimulating gut contractions, or softening stool so it passes more easily. What works best depends on whether you’re dealing with a one-time issue or a recurring problem.
Prune Juice: The Gold Standard
Prune juice works through a combination of three ingredients: sorbitol, pectin (a type of soluble fiber), and polyphenols. Sorbitol is a sugar alcohol your body can’t fully absorb, so it stays in your intestines and draws water in, softening your stool. A randomized placebo-controlled trial published in The American Journal of Gastroenterology found that prune juice significantly improved hard stools and subjective constipation complaints, with the researchers attributing the effect to this trio of compounds working together.
Start with about half a cup (4 ounces) and work up to a full cup if needed. Drinking too much at once can cause gas and cramping because of the sorbitol content. Most people notice results within a few hours, though it can take up to 12 hours.
Pear and Apple Juice
If you don’t like prune juice, pear and apple juice use the same basic mechanism. Both contain sorbitol, with pear juice containing more than apple juice. They also have a high ratio of fructose to glucose, which slows fructose absorption and adds to the osmotic effect in the gut. These juices are milder than prune juice, making them a good starting point for children or for people whose stomachs are sensitive to prune juice’s stronger taste and higher sorbitol load.
Look for juices with pulp or labeled “unfiltered” when possible. The retained fiber adds bulk and helps move stool along. Clear, filtered juices still work through the sorbitol mechanism but lose that fiber benefit.
Coffee, Especially in the Morning
Coffee stimulates bowel movements through a hormonal pathway, not just caffeine. A compound in coffee called furan triggers the release of gastrin from your stomach lining, and gastrin is a hormone that directly stimulates gut motility. Even decaf coffee causes this gastrin release, though the response is weaker than with regular coffee.
Timing matters. Your intestinal tract is most sensitive to movement first thing in the morning due to something called the gastrocolic reflex, which is your body’s natural tendency to move the bowels after you eat or drink. Drinking coffee in the morning amplifies this reflex. If constipation is your issue and you’re not already a coffee drinker, a single cup in the morning may be enough to help establish a regular pattern.
Senna Tea
Senna tea is an herbal laxative you can buy at most grocery stores and pharmacies. It contains natural compounds that stimulate the muscles in your intestinal wall, physically pushing stool forward. It typically produces a bowel movement in 6 to 12 hours, so many people drink it before bed and see results by morning.
This is a short-term solution. Senna is effective, but using it regularly for more than a week or two can make your bowels dependent on it. Your intestinal muscles may start to rely on the stimulation rather than contracting on their own. One cup steeped for about 10 minutes is a reasonable starting dose. If you find yourself reaching for senna tea multiple times a week, that’s a sign to look into the underlying cause of your constipation rather than continuing to treat the symptom.
Carbonated Water
Plain sparkling water may offer a mild advantage over still water. A double-blind study of 40 elderly participants found that those who drank carbonated water experienced fewer constipation symptoms than those who drank still water. The carbonation appears to stimulate some degree of intestinal activity, though the effect is modest compared to drinks that contain sorbitol or stimulant compounds. If you find plain water boring and struggle to stay hydrated, sparkling water is a reasonable swap that may provide a small extra benefit.
Magnesium-Rich Mineral Water
Certain mineral waters are naturally high in magnesium and sulfate, both of which draw water into your intestines. A clinical trial found that drinking one liter per day of mineral water containing 119 mg/L of magnesium and 1,530 mg/L of sulfate significantly reduced constipation by the second week. Not all mineral water has these concentrations, so check the label. Brands marketed as “high mineral content” or sourced from specific European springs (Hépar, Donat) tend to have the highest levels. Standard bottled water contains far less magnesium and won’t produce the same effect.
What About Plain Water?
The common advice to “just drink more water” for constipation is mostly overstated. Researchers at Monash University reviewed the evidence and found that increasing fluid intake alone has not been shown to improve constipation, except in people who are already dehydrated. If you’re drinking well below the general guideline of 1.5 to 2 liters (6 to 8 glasses) per day, bringing your intake up to that level can help. But if you’re already adequately hydrated, forcing extra glasses of water won’t make a difference.
Where water does matter is when you’re adding fiber to your diet. If you’re taking a fiber supplement like psyllium husk or eating more high-fiber foods, you need to increase your water intake alongside it. Psyllium absorbs many times its weight in water, and without enough fluid, it can actually worsen constipation or cause a blockage. Always mix psyllium thoroughly into a full glass of water and drink additional fluids throughout the day.
Warm Water vs. Cold Water
You’ll find plenty of advice online about drinking warm water in the morning to stimulate digestion. The reality is less exciting. Warm water may help relax your digestive tract and feel soothing, but there is no strong evidence that water temperature significantly improves digestion or bowel movements. Hydration itself matters far more than whether the water is warm or cold. Drink whichever temperature you prefer and will actually consume consistently.
A Practical Approach
For occasional constipation, start with a glass of prune juice or a cup of morning coffee. These are the two options with the most direct evidence and the fastest results. If you want something gentler, pear juice or sparkling water are reasonable alternatives. For constipation that’s lasted several days, senna tea offers reliable overnight relief.
For recurring constipation, drinks alone are rarely a complete solution. The most effective combination is adequate daily fluid intake (at least 1.5 to 2 liters), a fiber-rich diet or fiber supplement taken with plenty of water, and a morning routine that takes advantage of your body’s natural gastrocolic reflex. Coffee, prune juice, or even just breakfast with a glass of water can serve as the trigger. The goal is to build a pattern your body can follow rather than relying on any single drink as a fix each time things stall.