The fastest way to relieve constipation is with a saline enema, which typically produces a bowel movement within 1 to 5 minutes. If you’d rather start with something less invasive, you have several options that work within minutes to hours, depending on what you choose. Here’s a breakdown from fastest to slowest.
Enemas and Suppositories: The Fastest Options
Rectal treatments bypass the entire digestive tract and work directly where the blockage is. A saline enema works in 1 to 5 minutes. A mineral oil enema takes 2 to 15 minutes. Liquid glycerin suppositories also work within minutes, while solid glycerin suppositories take 15 minutes to an hour. All of these are available over the counter at any pharmacy without a prescription.
These are the go-to choice when you need relief right now, not in a few hours. They’re straightforward to use at home, and the packaging includes step-by-step instructions. The main downside is comfort: they’re not pleasant, and they can cause brief cramping as your bowels start moving. They’re meant for occasional use, not as a regular habit.
What You Can Drink Right Now
Coffee triggers increased colon contractions within four minutes of drinking it in people who are sensitive to the effect. Roughly 29% of people (mostly women) experience this response, and it works with both regular and decaf. If coffee has ever sent you to the bathroom before, it’s worth trying now.
Prune juice is another effective option you may already have in the kitchen. It contains sorbitol, a sugar alcohol that pulls water into the bowel and softens stool. As little as 2 ounces can improve constipation. Drinking it warm may speed things along, since warm liquids in general help stimulate gut movement. Expect results within a few hours rather than minutes.
Hydration itself matters more than people realize. Fiber and osmotic laxatives both depend on water to do their jobs. If you’re already mildly dehydrated, drinking a large glass or two of water can be enough to get things moving on its own.
Over-the-Counter Laxatives by Speed
Magnesium-based laxatives are the fastest oral option. Liquid magnesium citrate, the bottle you’ll find in the laxative aisle, works in 30 minutes to 6 hours. Adults can take 6.5 to 10 fluid ounces, and you should drink a full 8-ounce glass of water with each dose to prevent dehydration. This is a strong laxative, so stay close to a bathroom once you take it.
Stimulant laxatives like bisacodyl and senna take 6 to 12 hours. These work by triggering muscle contractions in the intestinal wall. Many people take them before bed so they work by morning. They’re effective, but the delay means they’re not your best bet if you need relief in the next hour.
Osmotic laxatives like polyethylene glycol (the powder you mix into water) take one to three days to reach full effect. They’re better suited for ongoing or recurring constipation than for fast relief.
Abdominal Massage
Massaging your abdomen in the direction your colon flows can help physically move things along. Start on your lower right side, press firmly and stroke upward toward your rib cage, then across to the left, then down the left side and inward. The entire massage takes five to seven minutes. Try doing it about 20 minutes before you expect to have a bowel movement, or combine it with another method on this list for a better chance of success. It won’t work miracles on its own, but it’s free, you can do it right now, and there’s no downside.
Body Positioning on the Toilet
If you’re sitting on the toilet and straining, your posture may be working against you. Placing your feet on a low stool so your knees are above your hips straightens the angle of your rectum, making it easier for stool to pass. Lean forward slightly with your elbows on your knees. This mimics a squatting position and reduces the amount of effort needed to go. It’s a small change that can make a real difference, especially when combined with something like a warm drink or a glycerin suppository.
Preventing the Next Episode
Once you’ve dealt with the immediate problem, a few daily habits can keep it from coming back. Fiber is the foundation. Insoluble fiber (found in whole grains, vegetables, and wheat bran) adds bulk and helps material move through your digestive system. Soluble fiber (found in oats, beans, and fruits) absorbs water and softens stool. Most people benefit from a mix of both. Increase your intake gradually, because adding too much fiber at once causes gas and bloating.
Fiber works best when it absorbs water, so consistent hydration is essential. Physical activity also helps. Even a 20-minute walk stimulates the muscles in your intestines. And if you feel the urge to go, don’t ignore it. Delaying bowel movements repeatedly trains your body to suppress the signals, which makes constipation worse over time.
When Constipation Is an Emergency
Most constipation resolves with the approaches above. But if you haven’t had a bowel movement for a prolonged stretch and you’re also experiencing severe abdominal pain or major bloating, that combination warrants an emergency room visit. Other warning signs include vomiting, blood in your stool, and unexplained weight loss. These symptoms can indicate a bowel obstruction or another serious condition that needs medical attention, not just a laxative.