Most constipation resolves with a combination of dietary changes, more water, and physical activity. If those don’t work within a few days, over-the-counter laxatives are safe for short-term use and typically produce results within hours to a few days depending on the type. Here’s a practical breakdown of what works, starting with the simplest fixes.
Eat More Fiber (but the Right Kind)
Fiber is the single most effective dietary tool for constipation, and most people don’t get enough. The National Academy of Medicine recommends 25 grams per day for women 50 or younger, 21 grams for women over 50, 38 grams for men 50 or younger, and 30 grams for men over 50. The average American eats about 15 grams, roughly half of what they need.
Not all fiber works the same way. Insoluble fiber, found in whole wheat, vegetables, and nuts, adds bulk to your stool and physically pushes material through your digestive system. This is the type that most directly relieves constipation. Soluble fiber, found in oats, beans, apples, and citrus fruits, dissolves in water and forms a gel-like material that softens stool. You want both, but if constipation is your main problem, focus on getting more insoluble fiber from whole grains, leafy greens, and the skins of fruits and vegetables.
One important caveat: increase fiber gradually over a week or two. Adding too much at once causes bloating and gas, which can make you feel worse before you feel better. Pair every increase in fiber with extra water, because fiber needs fluid to do its job. Without enough water, extra fiber can actually make constipation worse.
Prunes Work, and Here’s Why
Prunes aren’t just an old folk remedy. They contain sorbitol, a sugar alcohol that pulls water into the intestines the same way some medical laxatives do. Prunes pack about 14.7 grams of sorbitol per 100 grams, which is a potent dose. Eating four or five prunes (roughly 40 to 50 grams) gives you enough sorbitol to soften stool without overdoing it. Go easy: 20 grams or more of sorbitol can cause severe cramping, and too many prunes can swing you from constipation to diarrhea. Prune juice works too, especially for children, though whole prunes deliver more fiber alongside the sorbitol.
Drink More Water
Dehydration is one of the most common and most overlooked causes of constipation. Your colon absorbs water from the food passing through it. When you’re not drinking enough, your body pulls extra water from stool, leaving it hard and difficult to pass. There’s no magic number, but aiming for six to eight glasses a day is a reasonable baseline. Coffee and tea count toward your fluid intake, and coffee in particular can stimulate the colon to contract, which is why many people find a morning cup gets things moving.
Move Your Body
Physical activity stimulates the muscles in your intestines that push stool along. Even a 20-minute walk can make a noticeable difference, especially if you’ve been sedentary. You don’t need intense exercise. Regular, moderate movement like walking, swimming, or cycling is enough to keep your digestive system on schedule. People who sit for long periods, whether at a desk or during recovery from illness, are significantly more likely to become constipated.
Fix Your Toilet Posture
The position you sit in on the toilet matters more than most people realize. A muscle called the puborectalis wraps around your rectum like a sling. When you’re sitting upright on a standard toilet, this muscle stays tight and partially pinches the rectal passageway closed. When you move into a squatting position, the muscle relaxes and lengthens, opening the passage so stool can move through more easily.
You don’t need a squat toilet to get this benefit. Place a small footstool (six to nine inches tall) under your feet while sitting on the toilet, lean forward slightly, and let your knees rise above your hips. This mimics a squat and straightens the anorectal angle. Many people find this alone makes a surprising difference, especially if they’ve been straining.
Over-the-Counter Laxatives
If lifestyle changes haven’t worked after a few days, laxatives are the next step. They come in several types, and choosing the right one depends on how quickly you need relief and what’s causing the problem.
Bulk-forming laxatives (psyllium, methylcellulose) are the gentlest option. They work like a concentrated fiber supplement, drawing water into stool to make it larger and softer. Your colon then contracts naturally to push it out. They take 12 hours to three days to work and are safe for regular use.
Osmotic laxatives (polyethylene glycol, magnesium hydroxide) pull water from surrounding tissues into your colon, softening everything inside. Most take one to three days, but saline-based versions like milk of magnesia can work in as little as 30 minutes to six hours. These are a good choice for moderate constipation that hasn’t responded to fiber alone.
Stool softeners (docusate) increase the water and fat your stool absorbs, making it softer. They take 12 hours to three days and are often recommended after surgery or when straining could be harmful. They’re mild but tend to be less effective than osmotic laxatives for stubborn constipation.
Stimulant laxatives (bisacodyl, senna) activate the nerves controlling your colon muscles, forcing contractions that push stool through. They work within 6 to 12 hours and are effective for short-term relief. These are not ideal for daily use because your colon can become dependent on them over time, making it harder to go without them.
Lubricant laxatives (mineral oil) coat the lining of your colon so it can’t absorb water from stool, keeping things soft and slippery. They typically work in six to eight hours.
For most people, starting with a bulk-forming or osmotic laxative is the safest approach. Reserve stimulant laxatives for when gentler options haven’t worked.
Build a Routine
Your colon is most active in the morning and after meals, when a natural reflex triggers contractions. Taking advantage of this can train your body into a predictable pattern. Try sitting on the toilet for five to ten minutes after breakfast each day, even if you don’t feel an immediate urge. Over time, this consistency helps reset your body’s internal schedule. Don’t ignore the urge when it comes at other times, either. Repeatedly holding it in allows more water to be absorbed from stool, making it harder and more difficult to pass later.
Warning Signs That Need Attention
Occasional constipation is common and rarely signals anything serious. But certain symptoms alongside constipation warrant a medical evaluation. These include blood in your stool, unintentional weight loss of 10 pounds or more, a sudden change in stool shape or size, and constipation that appears abruptly in someone over 50 who has never had bowel issues. Iron deficiency anemia found on routine blood work, combined with constipation, is another red flag. These symptoms don’t necessarily mean something dangerous is happening, but they sometimes prompt doctors to check for structural problems or other conditions that wouldn’t respond to the strategies above.