Several drinks can help relieve constipation, and the best choice depends on how quickly you need relief. Prune juice is the most well-known option, but coffee, certain fruit juices, magnesium citrate, and even fermented drinks like kefir can all get things moving. Here’s what actually works and why.
Prune Juice
Prune juice is the classic go-to for a reason. It contains sorbitol, a natural sugar your body can’t fully absorb. Sorbitol pulls water into the intestines, softening stool and making it easier to pass. Prune juice also delivers a solid dose of fiber, which adds bulk and helps push things along.
A reasonable starting dose for adults is four to eight ounces per day. You don’t need to drink it all at once. Some people split it into a morning and evening serving. Give it a day or two to work before increasing the amount. Too much at once can cause bloating, gas, or cramping as the sorbitol draws excess water into your gut.
Coffee
If your morning cup already sends you to the bathroom, that’s not a coincidence. Coffee stimulates muscle contractions throughout your digestive tract. Caffeine plays a role, but compounds in coffee also trigger the release of gastrin, a hormone that ramps up gut motility.
Timing matters here. Your intestines are naturally most active in the morning due to something called the gastrocolic reflex, a wave of contractions that fires up when you eat or drink after sleeping. Coffee amplifies that reflex, which is why the effect feels strongest with your first cup. Both regular and decaf coffee have some effect, though caffeinated coffee is more potent. One important caveat: coffee is a mild diuretic, so pair it with water to avoid dehydration, which can make constipation worse.
Pear and Apple Juice
Pear juice and apple juice work through the same sorbitol mechanism as prune juice, just at different concentrations. Pear juice contains roughly four times more sorbitol than apple juice, making it the stronger option if prune juice isn’t your thing. Apple juice is milder and often better tolerated by people with sensitive stomachs, though it may take longer to produce results.
For children, these juices are especially useful since prune juice can be a hard sell with picky eaters. Babies aged 6 to 12 months can have up to one ounce of undiluted 100% apple, pear, or prune juice between feedings, with a maximum of four ounces in 24 hours. Children one year and older can have up to half a cup (125 mL) per day. The juice should not replace regular meals or milk feedings.
Water With Fiber Supplements
If you’re not getting enough fiber from food, mixing a fiber supplement like psyllium husk into water can help. Psyllium absorbs water and forms a gel-like bulk in your intestines, which stimulates the natural contractions that move stool along. The key detail most people miss: you need at least one full glass of water (250 mL) per teaspoon of psyllium. Taking it with too little water can actually cause intestinal blockages and make constipation worse.
Start with a small dose and increase gradually over several days. Fiber supplements work best as a daily habit rather than a one-time fix, and you should be drinking plenty of water throughout the day alongside them. Most people see improvement within two to three days of consistent use.
Magnesium Citrate
Liquid magnesium citrate is one of the fastest-acting options, typically producing a bowel movement within 30 minutes to 6 hours. It works similarly to sorbitol by drawing water into the intestines, but the effect is more pronounced. The standard adult dose is 6.5 to 10 fluid ounces, with a maximum of 10 ounces in 24 hours. You should drink a full eight-ounce glass of water with each dose.
This is a stronger intervention than juice or coffee. It’s best used for occasional, stubborn constipation rather than as a daily habit. Overuse can disrupt your electrolyte balance, particularly if you have kidney issues.
Kefir and Fermented Drinks
Kefir, a tangy fermented milk drink packed with probiotics, shows real promise for constipation. In a pilot study of 20 people with chronic constipation, drinking about two cups of kefir daily for four weeks led to significantly increased stool frequency, improved stool consistency, and reduced need for laxatives. Participants also reported higher overall bowel satisfaction scores. People with slow-moving colons saw a measurable acceleration in how quickly food traveled through the digestive tract.
Kefir won’t produce overnight results the way magnesium citrate will. Its benefit comes from shifting the balance of gut bacteria over time, which can improve motility on an ongoing basis. If your constipation is a recurring problem rather than a one-off event, adding kefir or other probiotic-rich drinks to your routine is worth trying.
Senna Tea
Senna tea is an herbal option that works differently from the drinks above. Instead of drawing water into the intestines, the active compounds in senna directly stimulate the muscles of your colon to contract. It typically produces a bowel movement in 6 to 12 hours, so many people drink it before bed and see results the next morning.
The tradeoff is that senna is a stimulant laxative, and your body can become dependent on it with regular use. If you’ve been using it for more than a week, that’s a signal to try other approaches. Senna tea is best reserved for occasional use when gentler options haven’t worked.
Plain Water
This one sounds obvious, but dehydration is one of the most common and overlooked causes of constipation. When your body doesn’t have enough water, it pulls more fluid from your colon, leaving stool hard and difficult to pass. Simply increasing your water intake throughout the day can be enough to resolve mild constipation, especially if you tend to drink less than you should. Every other drink on this list works better when you’re well hydrated, so water is the foundation regardless of what else you try.
What to Try First
For mild, occasional constipation, start with more water and a glass of prune or pear juice. If your morning coffee already helps, lean into that timing. For persistent issues, adding daily kefir and a fiber supplement gives you a longer-term strategy. Save magnesium citrate and senna tea for when gentler options haven’t done the job.
If constipation lasts longer than three weeks, comes with rectal bleeding, blood in your stool, black-colored stools, unexplained weight loss, persistent stomach pain, or unusual changes in stool shape, those are signs of something that needs a professional evaluation rather than a dietary fix.