The fastest way to trigger a bowel movement is a glycerin suppository or saline enema, which can produce results in as little as 15 minutes. If you need relief right now, those are your best options. But several other methods, from coffee to body positioning, can also get things moving within minutes to a few hours depending on how backed up you are.
Fastest Option: Suppositories and Enemas
A glycerin suppository works by drawing water into the rectum, softening the stool and triggering contractions. It typically produces a bowel movement in 15 minutes to one hour. You insert it rectally and lie on your side for a few minutes while it dissolves. These are available over the counter at any pharmacy.
A saline enema (like a Fleet enema) works on a similar timeline. It floods the lower colon with saltwater, which softens stool and stretches the rectal wall to trigger the urge. Most people feel the need to go within 5 to 15 minutes. If you’re dealing with a stubborn situation and want the most reliable, fastest result, an enema is the strongest non-prescription tool available.
Coffee and Warm Liquids
Coffee is genuinely effective for many people, and it can work before you even finish the cup. It stimulates contractions in the colon, and if stool is already sitting low and ready to move, coffee can be the nudge that gets things going within minutes. This works with both caffeinated and decaf coffee, though caffeine adds extra stimulation. Drinking it on an empty stomach, like first thing in the morning, tends to amplify the effect.
Warm water or tea can also help by relaxing the digestive tract and encouraging bowel movements, though the effect is milder than coffee. If you’re combining strategies, starting with a large warm drink is a good first step.
Change Your Sitting Position
The angle of your body matters more than most people realize. When you sit on a standard toilet, the muscle that wraps around your rectum (like a sling) only partially relaxes, creating a bend of about 100 degrees. When you squat, that angle opens to roughly 126 degrees, straightening the path and requiring significantly less straining.
You don’t need to squat on the toilet rim. A small footstool that raises your knees above your hips achieves most of the benefit. Research comparing sitting, low-chair sitting, and squatting found that squatting required the shortest time and the least effort to produce a bowel movement. If you’re sitting on the toilet right now reading this, putting your feet on a stool, a trash can, or a stack of books could make an immediate difference.
Abdominal Massage
Massaging your abdomen in the direction stool travels through your colon can physically help move things along. The technique sometimes called the “I Love U” massage follows three strokes: first, press down the left side of your abdomen (the “I”), then across the top from right to left and down the left side (an upside-down “L”), and finally up the right side, across the top, and down the left side (a “U” shape). Each stroke traces the path of your colon.
Clinical trials in elderly patients found that this massage performed for 15 minutes, twice daily, significantly increased the frequency of bowel movements and reduced abdominal bloating. In some cases it reduced the need for laxatives entirely. You can try this while sitting on the toilet or lying on your back with your knees bent. Use firm but comfortable pressure with your fingertips or the flat of your hand.
Magnesium Citrate
If suppositories and enemas aren’t an option, magnesium citrate is the next fastest oral remedy. It’s a liquid you drink (sold over the counter in bottles), and it works by pulling water into your intestines to soften stool and stimulate contractions. It typically kicks in within 30 minutes to 6 hours. Drink a full 8-ounce glass of water with each dose, because the mechanism depends on having enough fluid to draw into the gut.
This is more of a “within the next few hours” solution than a “within minutes” solution, but it’s powerful and reliable for acute constipation. It works faster on an empty stomach.
Stimulant Laxatives
Over-the-counter stimulant laxatives like bisacodyl and senna work by increasing intestinal contractions and reducing how much water your colon absorbs from stool. Taken orally, they take 6 to 12 hours to work, so they’re not immediate. However, bisacodyl is also available as a rectal suppository, which cuts the timeline to about 20 minutes.
If you’re planning ahead for tomorrow morning, taking an oral stimulant laxative at bedtime is a reasonable strategy. For right-now relief, stick with the rectal options or magnesium citrate.
Fiber Is Not a Quick Fix
Psyllium husk and other fiber supplements are excellent for preventing constipation over time, but they won’t help you right now. Fiber works by absorbing water and adding bulk to stool, which takes hours to days to produce results. Critically, if you take psyllium without enough water, it can actually make things worse by creating a denser, harder-to-pass mass. The recommended ratio is at least 500 to 600 mL of water (about 20 ounces) with a full daily dose.
Once you get through the current situation, adding fiber and water to your daily routine is one of the best ways to avoid ending up here again.
When Constipation Is Something More Serious
Normal constipation is uncomfortable but not dangerous. A bowel obstruction is. The key differences: an obstruction typically involves severe cramping that comes in waves and gets progressively worse, nausea or vomiting, a completely inability to pass gas (not just stool), bloating that keeps increasing, and signs of dehydration like dark urine and rapid heartbeat. If you’re experiencing that combination of symptoms, especially vomiting alongside severe abdominal pain and bloating, that needs emergency care rather than a laxative.
Staying Safe With Laxatives
Any method that pulls water into your intestines (enemas, magnesium citrate, osmotic laxatives) can disrupt your body’s balance of electrolytes, the minerals that keep your muscles, nerves, and heart rhythm functioning properly. For occasional use this is rarely a problem. Repeated or frequent use can lead to muscle cramps, weakness, irregular heartbeat, fatigue, and numbness or tingling in your hands and feet. If you find yourself relying on laxatives more than a couple of times a month, that’s worth investigating rather than continuing to treat on your own.