If you’re struggling to have a bowel movement, your options range from a glass of water and a cup of coffee to over-the-counter laxatives that work in different ways depending on how quickly you need relief. The best choice depends on whether you need something gentle for occasional sluggishness or faster-acting help for more stubborn constipation.
Start With What You Already Have
Before reaching for a product at the pharmacy, a few simple things can get your digestive system moving. Coffee is one of the most effective. It contains acids that boost levels of gastrin, a hormone that triggers the muscle contractions in your gut responsible for pushing things along. Coffee also increases release of cholecystokinin, another digestive hormone. For many people, a single cup is enough to produce a bowel movement within 20 to 30 minutes.
Water alone makes a difference, especially if you’re even mildly dehydrated. Hard, dry stool is the most common mechanical reason for constipation, and drinking 16 to 24 ounces of water (particularly first thing in the morning) can soften things enough to get them moving. Warm water or warm lemon water tends to work faster than cold.
Prunes are the classic home remedy, and they genuinely work through two separate mechanisms. Their soluble fiber softens stool by absorbing water, while their insoluble fiber adds bulk that helps push everything through. On top of that, prunes contain sorbitol, a naturally occurring sugar alcohol that draws extra water into the intestines. Eating five to six prunes (or drinking a small glass of prune juice) can produce results within a few hours.
Fiber Supplements for Everyday Regularity
If constipation is a recurring problem rather than a one-time event, a bulk-forming fiber supplement is the gentlest long-term fix. These products (psyllium husk is the most common) work by absorbing water and expanding inside your colon. The larger, softer stool triggers your colon’s natural contractions, and things move along on their own. Current dietary guidelines recommend about 14 grams of fiber for every 1,000 calories you eat each day, and most people fall well short of that.
The critical detail with fiber supplements is water. Research published in the Journal of the Academy of Nutrition and Dietetics found that psyllium works best at higher doses taken with at least 500 milliliters (about 17 ounces) of water. Taking fiber without enough fluid can actually make constipation worse by creating a dense, hard mass in your intestines. Aim for a full tall glass of water with every dose, and another glass within the hour.
Fiber supplements aren’t fast-acting. You may not notice a difference for one to three days, and they work best when taken consistently rather than as a one-time rescue. Think of them as a daily maintenance strategy rather than an emergency solution.
Osmotic Laxatives for Moderate Constipation
Osmotic laxatives pull water from surrounding tissues into your colon, softening the stool so it’s easier to pass. Polyethylene glycol 3350 (sold as MiraLAX and store-brand equivalents) is the most widely recommended option in this category. The standard adult dose is 17 grams of powder mixed into a drink, taken once a day. It typically takes one to three days to produce a bowel movement, so this isn’t an instant fix either.
Magnesium citrate is a faster osmotic option. Sold as a liquid in most pharmacies, it generally produces a bowel movement within 30 minutes to 6 hours. The adult dose is 6.5 to 10 fluid ounces, with a maximum of 10 ounces in 24 hours. It works well for short-term relief but pulls enough water into the intestines that you should drink plenty of fluids afterward to avoid dehydration. Many people use magnesium citrate as a one-time reset when they’ve been backed up for several days.
Stimulant Laxatives for Faster Relief
When you need results within hours, stimulant laxatives are the most direct option. These products activate the nerves controlling the muscles in your colon, forcing contractions that push stool through. Bisacodyl (Dulcolax) tablets typically work within 6 to 12 hours. Senna, often sold as Senokot, takes about 8 hours. Both work best if taken at bedtime so you have a bowel movement the next morning.
Bisacodyl also comes in suppository form, which works much faster: 10 to 45 minutes. If you go that route, stay close to a bathroom.
Stimulant laxatives are effective, but they’re more likely to cause cramping and urgency than gentler options. They’re best reserved for occasional use when other methods haven’t worked, not as a daily habit. If you’ve recently had abdominal surgery, an osmotic laxative is a better choice because it’s gentler on the muscles around the surgical site.
Why Stool Softeners May Not Be Enough
Stool softeners containing docusate sodium (Colace is the most familiar brand) are widely purchased, but the evidence behind them is surprisingly weak. They work by helping stool absorb more water and fat, which softens it. In theory that sounds helpful, but a review in The American Journal of Medicine found that the clinical evidence for docusate is poor quality, insufficient to recommend for or against its use. Osmotic laxatives, stimulant laxatives, and other options have much stronger evidence.
The real risk of relying on a stool softener is that it delays more effective treatment. If you’ve been taking one for a few days without results, switching to an osmotic or stimulant laxative is a reasonable next step.
Choosing Based on Your Timeline
- Within 30 minutes to 6 hours: Magnesium citrate liquid or a bisacodyl suppository.
- By tomorrow morning: A stimulant laxative (bisacodyl or senna tablet) taken at bedtime.
- Within 1 to 3 days: An osmotic laxative like polyethylene glycol, taken daily until things move.
- Ongoing prevention: A daily fiber supplement with plenty of water, prunes, regular coffee, and adequate hydration.
You can also combine approaches safely. A fiber supplement for daily maintenance plus an osmotic laxative during a rough stretch is a common and effective pairing. Adding a stimulant laxative on top of that for a single dose is fine when you really need it.
Signs Something More Serious Is Happening
Occasional constipation is normal, but certain symptoms alongside it signal a problem that needs medical attention. Blood in your stool, severe abdominal pain with major bloating, vomiting, or unexplained weight loss all warrant a call to your doctor rather than another trip to the laxative aisle. The same goes for constipation that doesn’t respond to any of the options above after a week or two, as that pattern sometimes points to an underlying condition worth investigating.