Water is the single most important thing to drink when you’re constipated, but it’s not the only option. Several beverages can actively help soften stool and get things moving, from prune juice to coffee to certain teas. The right choice depends on how quickly you need relief and whether you’re dealing with a one-time issue or an ongoing pattern.
Water Comes First
Dehydration is one of the most common and overlooked causes of constipation. When your body doesn’t have enough fluid, it pulls water from your intestines to use elsewhere, leaving stool hard and difficult to pass. Drinking 8 to 10 glasses of fluid per day can help prevent this. If you’re already constipated, increasing your water intake won’t produce instant results, but it creates the conditions your colon needs to move things along.
You may have heard that warm water works better than cold for stimulating digestion. There’s no evidence that temperature makes a difference. What matters is the volume you drink, not how warm it is. That said, if a warm glass of water first thing in the morning feels like it gets your gut moving, there’s no reason to stop.
Prune Juice Is the Gold Standard
Prune juice has a well-earned reputation as a natural laxative, and clinical research backs it up. In a study published through Harvard Health, participants who drank about one cup (200 grams) of 100% prune juice daily for eight weeks saw meaningful improvements in constipation symptoms compared to a placebo group.
Prune juice works through three mechanisms at once. It contains sorbitol, a sugar alcohol that draws water into the intestines and softens stool. It’s rich in pectin, a type of soluble fiber that adds bulk. And it contains polyphenols, plant compounds that support gut motility. This triple action is why prune juice tends to outperform other home remedies. Start with half a cup in the morning and increase to a full cup if needed. Drinking it on an empty stomach tends to produce faster results.
Apple and Pear Juice for Milder Relief
If prune juice isn’t your thing, apple juice and pear juice are solid alternatives. Both contain sorbitol, the same sugar alcohol that makes prune juice effective. Pear juice actually contains more sorbitol than apple juice, making it slightly more potent. Apple juice has a high fructose-to-glucose ratio, which can also pull water into the bowel.
These juices are especially popular for children with constipation, since the taste is more appealing and the effect is gentler. For adults, a glass or two per day is reasonable. Stick with 100% juice rather than juice cocktails, which are diluted with added sugar and less effective.
Coffee Can Work Fast
Coffee stimulates the colon in a way that most other beverages don’t. Research published in the journal Gut found that coffee increased motor activity in the lower colon within four minutes of drinking it, and the effect lasted at least 30 minutes. Interestingly, decaffeinated coffee triggered the same response, suggesting the stimulation comes from compounds in coffee itself rather than caffeine alone. Hot water, by comparison, had no effect.
There’s a catch: coffee only works for some people. In the study, about 60% of participants responded with increased colon activity, while the rest showed no change. If coffee has never prompted a bathroom visit for you, it’s unlikely to help when you’re constipated. Coffee is also a mild diuretic, so if you rely on it, make sure you’re drinking enough water alongside it to avoid making dehydration worse.
Senna Tea for Stronger Relief
Senna tea is an herbal laxative you can find in most grocery stores and pharmacies, often sold under names like “Smooth Move.” It contains natural compounds called sennosides that irritate the lining of the bowel, triggering contractions that push stool forward. It also draws fluid into the intestines.
Senna tea typically works within 6 to 12 hours, so drinking a cup before bed often produces a bowel movement by morning. It’s effective, but it’s not meant for regular use. The Mayo Clinic notes that senna should not be used for more than one week without consulting a doctor, as long-term use can make your colon dependent on stimulation to function normally. Think of senna tea as a short-term fix, not a daily habit.
Magnesium Citrate for Stubborn Cases
Liquid magnesium citrate is available over the counter at most pharmacies and works as an osmotic laxative, meaning it floods your intestines with water to soften stool and trigger contractions. It’s one of the faster-acting options, typically producing results within 30 minutes to 6 hours.
This is a stronger intervention than juice or tea. Magnesium citrate is the kind of drink you choose when gentler options haven’t worked and you need reliable relief. It’s often the same preparation used before medical procedures like colonoscopies, so expect it to be thorough. Drink a full glass of water with it to stay hydrated, since it pulls a significant amount of fluid into the bowel.
Fiber Drinks Need Plenty of Water
Psyllium husk drinks (like Metamucil) are a common go-to for constipation, and they work well when used correctly. Psyllium is a soluble fiber that absorbs water and forms a gel-like bulk in your intestines, making stool softer and easier to pass. But there’s a critical detail many people miss: you need to drink at least one full glass of water (250 mL) for every teaspoon of psyllium. Taking psyllium without enough water can actually cause intestinal blockages, making your constipation worse instead of better.
If you add a fiber supplement drink to your routine, plan on increasing your total daily water intake by at least two to three extra glasses. Fiber without fluid is a recipe for more problems.
What to Avoid Drinking
Alcohol dehydrates you and slows gut motility, making constipation worse. Sugary sodas and energy drinks can also contribute to dehydration and provide no fiber or sorbitol to help move things along. Milk and dairy-based drinks cause constipation in some people, particularly those with lactose sensitivity. If you notice a pattern between dairy and difficult bowel movements, cutting back on milk-based beverages is worth trying.
Putting It All Together
For mild constipation, start with increased water intake and a daily glass of prune juice. Add coffee in the morning if you’re someone who responds to it. For constipation that’s lasted a few days and isn’t budging, senna tea before bed or a dose of magnesium citrate can provide faster relief. If you’re adding fiber supplements, always pair them with extra water.
Constipation that lasts longer than three weeks, involves blood in your stool, or comes with severe abdominal pain warrants a call to your doctor. These can be signs of something beyond what fluids alone can address.