How to Relieve Constipation From Prednisone

Relieving constipation caused by prednisone usually starts with a combination of increased fluid and fiber intake, regular physical activity, and an over-the-counter osmotic laxative such as polyethylene glycol (MiraLAX). Prednisone slows the movement of food through the intestines and disrupts the gut’s microbial balance, so the fix often requires attacking both problems at once. The good news is that most people can manage this side effect without a prescription, and the constipation typically improves once the steroid course ends or the dose drops.

Why Prednisone Slows Your Gut

Prednisone is a glucocorticoid, a class of steroid that suppresses inflammation and the immune system. These are useful properties for treating conditions like asthma, autoimmune disorders, and organ transplant rejection. But glucocorticoids also affect the muscles and nerves that move food through your digestive tract. In animal studies, prednisone slowed intestinal transit even though it actually sped up how quickly the stomach emptied. In other words, food left the stomach faster but then moved sluggishly through the intestines, exactly the pattern that produces hard, infrequent stools.¹

Prednisone also reshapes the community of bacteria living in your gut. A randomized controlled trial in healthy young men found that oral glucocorticoids shifted the abundance of several bacterial species, boosting some linked to insulin resistance and immunosuppression while reducing others associated with a healthy metabolism.² These microbial changes can alter how quickly waste moves through the colon and how much water gets absorbed from stool, both of which contribute to constipation. So prednisone creates a two-pronged problem: it slows the mechanical transit of material through the intestines and destabilizes the microbial environment that helps regulate digestion.

Fiber, Fluids, and Food Choices

The single easiest adjustment you can make is increasing both fiber and water intake. Prednisone already encourages your intestines to absorb more water from stool, leaving it dry and hard. Drinking more fluids counteracts that directly. Aim for at least eight glasses of water a day, and more if you’re physically active or the weather is hot. Coffee and tea count toward fluid intake and can mildly stimulate the colon, but alcohol and sugary drinks tend to dehydrate you, so they work against you here.

Fiber adds bulk to stool and helps it retain moisture. There are two types worth knowing about. Insoluble fiber, found in whole grains, nuts, and the skins of fruits and vegetables, speeds transit by adding physical bulk. Soluble fiber, found in oats, beans, lentils, and fruits like apples and pears, forms a gel that softens stool. You want both. If your current diet is low in fiber, increase it gradually over a week or two. Adding a large amount all at once can cause bloating and gas, which feels worse on top of existing constipation.

Prunes deserve a special mention. They contain both fiber and sorbitol, a natural sugar alcohol that draws water into the intestine and acts as a gentle osmotic laxative. A handful of prunes or a small glass of prune juice daily is a low-risk starting point that many people find effective before they need to reach for any medication.

How Physical Activity Helps

Exercise gets your intestines moving. A systematic review of cohort studies found that moderate and high levels of physical activity offered more protection against constipation than low activity levels. The proposed mechanisms include stimulating intestinal peristalsis (the rhythmic muscle contractions that push material through the digestive tract) and reducing overall colonic transit time.³

You don’t need an intense workout. Even a walk helps. Research measuring gut motility in healthy adults found that indicators of intestinal movement increased within one to two minutes of walking compared to sitting still. The investigators noted that these short-term boosts in peristalsis, accumulated over repeated bouts of activity, could have meaningful long-term effects on gut motility.⁴ A 20- to 30-minute walk after a meal is a simple habit that helps on two fronts: it stimulates the gastrocolic reflex (the natural urge to have a bowel movement after eating) and it directly promotes intestinal contractions.

If you’re on prednisone for a condition that limits your ability to exercise, like a severe flare of inflammatory bowel disease or joint inflammation, do what you can. Gentle stretching, yoga, or even slow walking around the house is better than immobility. The key is to avoid prolonged sitting or lying down when your body allows movement.

Over-the-Counter Laxatives Worth Trying

When lifestyle changes alone aren’t enough, over-the-counter laxatives are the next step. Not all laxatives work the same way, and the evidence behind them varies.

Osmotic Laxatives

Polyethylene glycol, sold as MiraLAX in the United States and Movicol in many other countries, is the best-studied option for everyday constipation. It works by drawing water into the colon, softening stool and making it easier to pass. An open-label study of long-term use found it safe and effective for up to 12 months, with no evidence that people needed increasing doses over time to get the same effect.⁵ That makes it a reasonable choice for people on longer prednisone courses, since you can use it daily without worrying about dependence or tolerance.

The standard dose is one capful (about 17 grams) dissolved in a glass of water once a day. It usually takes 24 to 72 hours to produce a bowel movement the first time, so patience is needed. After that, daily use tends to keep things moving. Magnesium-based osmotic laxatives like milk of magnesia are another option, but they need more caution in people with kidney problems because the magnesium can accumulate.

Stimulant Laxatives

Bisacodyl (sold as Dulcolax) and senna are stimulant laxatives that work differently from osmotic ones. Bisacodyl has a dual action: it directly stimulates muscle contractions in the large bowel, reducing transit time, and it increases the water content of stool.⁶ Senna works through a similar stimulant mechanism. Both are best used for short-term relief or as a rescue option when osmotic laxatives aren’t enough on their own.

A common and effective approach is to take an osmotic laxative daily for maintenance and keep a stimulant laxative on hand for the days when you still haven’t had a bowel movement after two or three days. Using stimulant laxatives every day for weeks is generally discouraged because the bowel can become dependent on external stimulation, though the old fears about permanent “lazy bowel” are overstated. Still, for prednisone-related constipation, osmotic laxatives should be the backbone of your over-the-counter strategy.

Stool Softeners

Docusate sodium (Colace) is one of the most commonly recommended stool softeners, but the evidence behind it is underwhelming. A medication use evaluation at a VA healthcare center found that patients receiving docusate sodium still needed rescue laxatives at roughly the same rate as patients not receiving it. About 58% of patients on docusate required a rescue medication compared to 52% of patients without it.⁷ That study focused on opioid-induced constipation rather than steroid-induced, but the results reflect a broader trend in the literature: docusate alone doesn’t do much. If you’re going to spend money on a laxative, polyethylene glycol or bisacodyl will give you more reliable results.

Probiotics and Gut Microbiome Support

Because prednisone disrupts the gut microbiome, restoring microbial balance may help. A study of patients with Crohn’s disease found that combining glucocorticoid treatment with probiotics reduced the incidence of side effects including abdominal distension.⁸ That study dealt with a patient population already experiencing gut inflammation, so the benefits may not translate directly to everyone on prednisone. But the underlying logic holds: if prednisone shifts your bacterial populations away from species that support healthy digestion, introducing beneficial bacteria through probiotics or fermented foods may partially offset the disruption.

The probiotic strains with the best evidence for constipation in general include certain Bifidobacterium and Lactobacillus species. Yogurt, kefir, sauerkraut, kimchi, and other fermented foods provide a natural supply. Over-the-counter probiotic supplements are another option, though the landscape of products is messy. Quality and strain composition vary enormously between brands, and most haven’t been tested specifically for steroid-induced constipation. If you try a probiotic supplement, look for one containing multiple strains and at least several billion colony-forming units per dose. Give it at least two to three weeks before deciding whether it’s helping.

Prebiotics, the types of dietary fiber that feed beneficial gut bacteria, are also worth considering. Foods high in prebiotics include garlic, onions, leeks, asparagus, bananas, and whole grains. Eating more of these while on prednisone supports both fiber intake and microbiome recovery, addressing two contributors to constipation at once.

Prescription Options for Stubborn Cases

If you’ve tried fiber, fluids, exercise, and over-the-counter laxatives and you’re still backed up, a prescription medication may be appropriate. Lubiprostone (Amitiza) is one option your doctor might consider. It works by activating chloride channels in the cells lining the intestine, which pulls fluid into the bowel and softens stool. In a trial of patients whose constipation hadn’t responded to other therapies, lubiprostone produced a full response in roughly 53% to 67% of patients over four weeks, compared to about 32% to 47% on placebo.⁹

Linaclotide (Linzess) and plecanatide (Trulance) are newer drugs in the same general category of prescription secretagogues. They work by a slightly different mechanism but achieve the same goal: more fluid in the intestine, softer stools, faster transit. These medications are typically reserved for chronic idiopathic constipation or irritable bowel syndrome with constipation, but a doctor managing severe prednisone side effects might prescribe one if simpler measures have failed.

If you’re on a long-term prednisone regimen and the constipation is persistent, it’s worth asking your prescribing doctor whether the dose can be lowered or the drug switched to a different corticosteroid with fewer gastrointestinal effects. Methylprednisolone and budesonide, for instance, have different pharmacokinetic profiles and may affect gut transit differently. The priority is controlling whatever condition warranted the steroid in the first place, but adjusting the regimen is sometimes possible.

Timing and Daily Routine Tips

Beyond specific remedies, the way you structure your day matters. Your colon is most active in the morning, particularly after your first meal. Take advantage of this by drinking a warm beverage when you wake up, eating breakfast within an hour, and then giving yourself unhurried time in the bathroom. Many people skip this window because of a rushed morning schedule, and that missed opportunity can reinforce a cycle of holding and straining.

If you’re taking prednisone first thing in the morning (as most people do, to match the body’s natural cortisol rhythm), take your osmotic laxative at the same time so it becomes automatic. Consistency matters more than perfection. A daily routine that includes a glass of water with your polyethylene glycol, a fiber-rich breakfast, and a walk afterward is a surprisingly effective three-step approach that addresses the mechanical, hydration, and motility aspects of the problem simultaneously.

One practical point about prednisone itself: the drug increases appetite and can lead people to eat more processed, low-fiber comfort foods. That shift in diet makes constipation worse independently of anything the drug does to the gut. Being mindful of food quality during a prednisone course does double duty, counteracting both the appetite-driven dietary shift and the drug’s direct effects on gut transit.

When to Call Your Doctor

Most prednisone-related constipation is uncomfortable but not dangerous. There are situations, however, where you should seek medical attention rather than trying to manage things on your own. Contact your doctor if you haven’t had a bowel movement in more than a week, if you develop severe abdominal pain or bloating, if you notice blood in your stool, or if you’re vomiting along with the constipation. These could signal a bowel obstruction or another complication that requires more than a laxative.

Prednisone, especially at higher doses and for longer durations, can cause other gastrointestinal problems besides constipation, including gastric ulcers and pancreatitis. If your abdominal symptoms feel different from typical constipation, such as sharp upper-abdominal pain, pain that radiates to your back, or a rigid abdomen, don’t assume it’s “just constipation” and self-treat. That warrants a same-day medical evaluation.

People with pre-existing conditions like hypothyroidism, diabetes, or neurological disorders are already predisposed to slow gut transit. Prednisone layered on top of an existing motility problem can create more severe constipation that lifestyle measures alone won’t fix. If that describes your situation, talk to your doctor early in the prednisone course about a preemptive bowel regimen rather than waiting until you’re already uncomfortable.