Can You Use Glycerin Suppositories While Pregnant?

Glycerin suppositories are generally considered safe to use during pregnancy because they act locally in the rectum and are absorbed very little into the bloodstream. That said, no clinical trials have specifically tested glycerin suppositories in pregnant women, so the safety profile is inferred rather than proven. Most clinical guidelines place them in the same category as other laxatives with minimal systemic absorption, meaning they are unlikely to pose a risk to a developing baby but should still be used occasionally and ideally after a conversation with your healthcare provider.

Why Constipation Is So Common During Pregnancy

If you are dealing with constipation while pregnant, you have plenty of company. Estimates suggest that somewhere between a quarter and nearly half of pregnant women experience constipation at some point during their pregnancy. The reasons are partly hormonal and partly mechanical. Rising hormone levels during pregnancy slow the movement of food through the digestive tract, giving the intestines more time to absorb water from stool, which makes it harder and more difficult to pass. An animal study found that estrogen, rather than progesterone, decreased gastrointestinal movement in mice, though this remains a subject of ongoing debate in human research.¹

Beyond hormones, there are other contributors. Iron supplements, which many pregnant women take, are a well-known cause of constipation. As the uterus grows, it presses against the intestines and can physically slow things down. Reduced physical activity during pregnancy, changes in diet, and even the stress and disrupted routines of pregnancy can compound the issue. For many women, the problem gets worse in the second and third trimesters as the baby grows larger.

How Glycerin Suppositories Work

Glycerin suppositories are a rectal laxative. You insert a small, solid, bullet-shaped dose into the rectum, where it melts at body temperature and does two things: it draws water into the lower bowel through osmotic action, and it mildly irritates the lining of the rectum, which triggers the muscles there to contract. The result is usually a bowel movement within 15 to 60 minutes.

The key detail that matters during pregnancy is that glycerin acts almost entirely at the site where it is placed. It does very little traveling through your bloodstream. This “minimal systemic absorption” is the main reason healthcare providers generally feel comfortable with its occasional use during pregnancy. A review in Canadian Family Physician noted that although few types of laxatives have been formally assessed for safety in pregnancy, those with minimal systemic absorption are not expected to be associated with an increased risk of congenital anomalies.²

The Evidence Gap

Here is where the honest picture gets a bit uncomfortable. When researchers conducted a Cochrane systematic review looking at interventions for constipation in pregnancy, they found no data at all for suppositories and enemas. The review explicitly noted the absence of evidence for this category of treatment.³ That does not mean glycerin suppositories are dangerous. It means nobody has run a randomized controlled trial enrolling pregnant women and testing glycerin suppositories against a placebo to measure outcomes. This is a common situation in obstetric medicine: ethical concerns about enrolling pregnant women in drug trials create gaps in the data, and clinicians end up relying on a combination of the drug’s known pharmacology, its decades of widespread use, and the general principle that locally-acting agents with negligible bloodstream absorption carry very low risk.

So when your doctor or midwife says glycerin suppositories are “probably fine,” they are making a reasonable clinical judgment, not citing a definitive pregnancy safety trial. That distinction matters because it means you should treat suppositories as an occasional tool rather than a daily habit, and you should loop in your provider before making them a regular part of your routine.

What to Try Before Reaching for a Suppository

Clinical guidelines consistently recommend starting with non-drug approaches. The standard first-line advice is to increase dietary fiber, drink more fluids, and get regular physical activity.² In practice, that means aiming for around 25 to 30 grams of fiber a day through whole grains, fruits, vegetables, and legumes, along with plenty of water. Walking, swimming, and prenatal yoga can all help keep things moving.

The catch is that these lifestyle measures do not always work. The same clinical guidance acknowledges that fiber, fluids, and exercise are sometimes ineffective, at which point laxatives become a reasonable next step.² If you have been eating well, staying hydrated, and staying active and you are still struggling, that is a perfectly valid reason to consider something more.

A few other practical tips before turning to medication:

Timing: Try to use the bathroom at consistent times, especially after meals, when the body’s natural gastrocolic reflex is strongest.
Iron supplements: If your prenatal vitamin contains iron and you suspect it is worsening your constipation, ask your provider about switching to a different formulation or taking a lower dose more frequently.
Prune juice: This is a time-tested, gentle osmotic laxative that many providers suggest before moving to over-the-counter medications.

Where Glycerin Suppositories Fit Among Other Laxative Options

When lifestyle changes are not enough, several categories of laxatives are available, and it helps to understand where glycerin suppositories sit in the lineup. Clinical reviews generally list the following options for pregnant women: bulk-forming agents, stool softeners, osmotic laxatives, lubricant laxatives, stimulant laxatives, and suppositories or enemas.²

Bulk-forming agents: Products like psyllium husk work by absorbing water in the gut and expanding, which makes stool softer and easier to pass. They are usually the first pharmacological step because they are gentle and have a long track record. The downside is they take a day or two to work, and they can cause bloating.
Stool softeners: Docusate sodium is widely recommended during pregnancy. It helps water mix into stool so it is not as hard. Evidence for its effectiveness is actually fairly thin, but it is considered low-risk.
Osmotic laxatives: These draw water into the intestines. Polyethylene glycol (sold as MiraLAX in the US) and lactulose are the two most common. A clinical study comparing the two in pregnant women found both were effective, with polyethylene glycol working somewhat faster.⁴
Stimulant laxatives: Products like bisacodyl and senna directly stimulate the bowel wall to contract. They work, but they carry a higher risk of cramping and are generally reserved for occasional use.
Glycerin suppositories: They act locally, work quickly, and have minimal absorption. They are most useful when you need relief relatively fast and do not want to wait for an oral laxative to take effect.

The practical advantage of a glycerin suppository is speed. Oral laxatives can take hours or even days. A suppository usually produces results within an hour, sometimes much sooner. That makes it a useful option when constipation has become acutely uncomfortable and you need relief now rather than tomorrow morning.

Trimester Considerations

You might wonder whether glycerin suppositories are safer at certain points in pregnancy than others. The first trimester is when the baby’s organs are forming, so there is a general principle of being more cautious with any medication during those early weeks. Because glycerin suppositories act locally and are barely absorbed, the theoretical risk during any trimester is very low, but the complete absence of trimester-specific clinical trial data means this reassurance comes from pharmacological reasoning rather than direct study.³

In the third trimester, constipation tends to be at its worst due to the baby’s size and the mechanical pressure on the bowel, and many women find they need more intervention than diet alone can provide. Providers are generally more relaxed about occasional suppository use at this stage, partly because organogenesis is complete and partly because the discomfort of severe constipation (and the straining that comes with it) carries its own risks, including worsening hemorrhoids.

Risks of Overuse

The main concern with glycerin suppositories is not a single use here and there but repeated, frequent use. Using any rectal laxative too often can lead to the bowel becoming dependent on external stimulation, meaning it gets “lazy” about producing its own contractions. Clinical guidance recommends that osmotic and stimulant laxatives be used only short-term or occasionally during pregnancy to avoid dehydration or electrolyte imbalances.² While glycerin suppositories are milder than stimulant laxatives, the same general caution applies: they should be a fallback rather than a fixture.

Rectal irritation is another possibility. The mild irritant effect that triggers a bowel movement can become uncomfortable if you use suppositories several days in a row. If you notice rectal soreness, bleeding, or increasing discomfort, stop using them and talk to your provider. Hemorrhoids, which are already more common during pregnancy, can be aggravated by frequent suppository insertion.

There is also a practical distinction between glycerin suppositories and other rectal products you might see on the pharmacy shelf. Bisacodyl suppositories (like Dulcolax) are stimulant laxatives and are a different beast. They are more aggressive, more likely to cause cramping, and carry the electrolyte and dehydration warnings more seriously. If you are reaching for a suppository during pregnancy, make sure the active ingredient is glycerin, not bisacodyl, unless your provider specifically says otherwise.

When to Call Your Provider

Occasional constipation during pregnancy is normal and can usually be managed at home. But certain situations warrant a call to your doctor or midwife rather than self-treating:

No bowel movement for several days: If you have gone three or more days without a bowel movement and home remedies are not working, get guidance before escalating to stronger laxatives.
Severe abdominal pain or cramping: Constipation can cause mild discomfort, but sharp or persistent pain could indicate something else that needs medical evaluation.
Blood in your stool: This is often from hemorrhoids, which are common in pregnancy, but it should be confirmed by a professional rather than assumed.
Constipation alternating with diarrhea: This pattern can point to an underlying condition that needs attention.
Frequent need for laxatives: If you find yourself using glycerin suppositories or any other laxative more than a few times a week, your provider may want to investigate the cause or suggest a different long-term strategy.

Do not be embarrassed to bring up constipation at a prenatal visit. Providers hear about it constantly, and they would much rather help you find a safe and effective plan than have you experiment on your own or suffer in silence.

Hemorrhoids, Straining, and the Bigger Discomfort Picture

Constipation during pregnancy does not exist in isolation. It is deeply connected to hemorrhoids, which affect a significant percentage of pregnant women, especially in the third trimester. Straining to pass hard stool increases pressure on the veins around the rectum and anus, causing them to swell. Pregnancy itself already increases pressure in the pelvic area due to the growing uterus and increased blood volume, so adding straining on top of that is a recipe for hemorrhoids getting worse.

This is actually one of the practical arguments in favor of using a glycerin suppository when you genuinely need one. A quick, gentle bowel movement with minimal straining is kinder to already-stressed pelvic tissues than ten minutes of pushing against a hard stool. In this light, occasional suppository use is not just about comfort; it can help avoid a secondary problem that causes its own significant discomfort.

If you already have hemorrhoids, inserting a suppository can be uncomfortable, and you should be gentle. Lubricating the tip of the suppository with a small amount of water or a water-based lubricant can help. If hemorrhoids are so swollen or painful that insertion feels impossible, your provider may have alternative suggestions, such as switching to an oral osmotic laxative instead.

What About Other Rectal Products Like Enemas

Fleet enemas and similar saline enema products are another option you might encounter on the pharmacy shelf. These are different from glycerin suppositories in both mechanism and risk profile. A saline enema introduces a larger volume of fluid into the rectum to flush out stool, and the sodium phosphate in some formulas can, in rare cases, cause dangerous electrolyte shifts. While this risk is low with a single standard dose in a healthy adult, pregnant women are already managing a more delicate fluid and electrolyte balance, which is why most providers prefer glycerin suppositories or oral laxatives over enemas during pregnancy.

Mineral oil enemas are yet another category. Mineral oil is a lubricant laxative that coats the stool and makes it slippery. When used rectally in small amounts, absorption is minimal, but mineral oil taken orally during pregnancy has raised some theoretical concerns about interfering with fat-soluble vitamin absorption. For this reason, mineral oil is generally not a first choice during pregnancy in any form, though occasional rectal use is considered low-risk by most providers.

The Cochrane review that found no clinical trial data for suppositories also found no trial data for enemas in pregnancy, so the same evidence gap exists across all rectal therapies.³ In practice, glycerin suppositories remain the most commonly recommended rectal option during pregnancy because they are simple, act locally, and their active ingredient is one of the mildest available.

1
PubMed Central. Estrogen rather than progesterone cause constipation in both female and male mice
2
PubMed Central. Treating constipation during pregnancy
3
PubMed Central. Interventions for treating constipation in pregnancy
4
Annals of Palliative Medicine. A comparison of the safety and efficacy of polyethylene glycol 4000 and lactulose for the treatment of constipation in pregnant women