Constipation is one of the most common — and most uncomfortable — complaints during pregnancy, and it’s completely understandable to wonder which remedies are actually safe to use while pregnant. Miralax and other stool softeners often come up as options, but not every laxative carries the same safety profile during pregnancy. Here’s a clear breakdown of what’s considered safe, what lifestyle changes can help, and when constipation warrants a call to your healthcare team.
Why Is Constipation So Common During Pregnancy?
Pregnancy triggers a mix of hormonal and physical changes that can slow down digestion. Rising progesterone levels relax smooth muscle throughout the body, including in the intestines, which can slow the movement of stool through the digestive tract. As the pregnancy progresses, the growing uterus can also put physical pressure on the intestines. Iron supplements, which many pregnant women take to support healthy blood levels, are another common contributor to constipation.
Is It Safe to Take Miralax During Pregnancy?
Miralax’s active ingredient, polyethylene glycol 3350, works as an osmotic laxative that draws water into the stool to soften it and make it easier to pass. While many stool softeners and certain laxative categories are generally considered safe during pregnancy, it’s essential to check with a member of your healthcare team before starting Miralax or any other over-the-counter product, since individual health circumstances can affect which option is most appropriate for you.
Stool softeners more broadly — including docusate sodium (Colace) and docusate calcium (Surfak) — are generally considered safe during pregnancy. These products moisten the stool rather than stimulating the intestines, and their active ingredient is only minimally absorbed into the bloodstream, which is why they’re unlikely to affect a developing baby.
What Other Laxatives Are Considered Safe During Pregnancy?
Beyond stool softeners, several other categories of laxatives are typically considered safe options for pregnancy constipation, always with a healthcare professional’s guidance:
| Laxative Type | Examples | How It Works |
| Bulk-forming laxatives | Psyllium (Metamucil, Konsyl), polycarbophil (FiberCon, Equalactin) | Adds bulk to stool; not absorbed by the body |
| Saline laxatives | Magnesium hydroxide (Phillips’ Milk of Magnesia, Dulcolax), magnesium citrate | Draws water into the intestines |
| Stimulant laxatives | Bisacodyl (Ducodyl) | Stimulates intestinal contractions |
| Osmotic laxatives | Lactulose (Cholac, Constilac) | Draws water into the colon to soften stool |
| Stool softeners | Docusate sodium (Colace), docusate calcium (Surfak) | Moistens stool for easier passage |
Many of these products are available without a prescription, but that doesn’t mean they should be started without medical input. Even non-prescription options can interact with other conditions or medications, so it’s worth a quick conversation with your obstetric provider before adding one to your routine.
How Does Iron Contribute to Pregnancy Constipation?
Iron is an important nutrient during pregnancy, supporting the increased blood volume needed to nourish both parent and baby. However, iron supplements are also a well-known cause of constipation. If you’re taking an iron supplement and notice worsening constipation, mention it to your healthcare team — they may recommend adjusting the supplement or adding a stool softener to your routine to offset the effect.
What Lifestyle Changes Can Help Prevent Pregnancy Constipation?
In many cases, pregnancy constipation can be eased or even prevented without medication, through a few consistent habits:
- Drink plenty of fluids. Water is generally the best choice, and prune juice is often specifically helpful for constipation.
- Stay physically active. Regular movement, as approved by your healthcare provider, helps keep digestion moving.
- Increase dietary fiber. Fruits, vegetables, beans, and whole grains all support regular bowel movements. A fiber supplement, such as Metamucil or Citrucel, may also help — check with your healthcare professional first.
These lifestyle steps are often recommended as the first line of defense before adding any medication, since they address some of the root causes of pregnancy-related constipation rather than just managing the symptom.
How Common Is Constipation During Pregnancy?
Constipation is one of the most frequently reported digestive complaints throughout pregnancy, and it can occur at any stage — though many people notice it becoming more pronounced as the pregnancy progresses and the growing uterus puts more pressure on the intestines. It’s considered a normal, manageable part of pregnancy for most people, rather than a sign of a serious problem.
When Should You Contact Your Healthcare Provider About Constipation?
While occasional constipation is common and usually manageable at home, it’s worth reaching out to your healthcare team if you notice:
- Constipation that doesn’t improve with fluids, fiber, and activity
- Severe abdominal pain
- Blood in your stool
- Constipation alternating with diarrhea
- Symptoms that interfere significantly with daily life
Your healthcare provider can help determine whether an underlying issue needs to be addressed and can recommend the most appropriate treatment for your specific situation.
What Should You Ask Your Healthcare Provider Before Starting Any Laxative?
Before starting Miralax or any other laxative during pregnancy, it can help to ask your provider:
- Is this specific product appropriate for my stage of pregnancy?
- Could it interact with my prenatal vitamins or other medications?
- How long can I safely use it before checking back in?
- Are there lifestyle changes I should try first or alongside it?
Frequently Asked Questions
Is Miralax the same as a stool softener?
Not exactly. Miralax is an osmotic laxative that draws water into the stool, while stool softeners like docusate sodium work by moistening the stool directly. Both are generally discussed as pregnancy-safe categories, but you should confirm with your healthcare provider before use.
Can prune juice really help with pregnancy constipation?
Yes, prune juice is often recommended alongside water as a natural way to help relieve constipation during pregnancy.
Why does iron make pregnancy constipation worse?
Iron supplements are a well-documented cause of constipation. Since iron is important during pregnancy, your provider may suggest pairing it with a stool softener rather than stopping the supplement.
How many bowel movements a week is considered normal during pregnancy?
Pregnancy constipation is generally defined as having fewer than three bowel movements per week, though normal frequency varies from person to person.
Are stimulant laxatives safe throughout all of pregnancy?
Stimulant laxatives like bisacodyl are generally considered a safe option during pregnancy, but they’re typically used under a healthcare provider’s guidance rather than as a first-line, everyday solution.
This article is for general educational purposes and is not a substitute for professional medical advice. Always consult your healthcare provider before starting any new medication during pregnancy.
