Safe Laxatives During Pregnancy (2026)

If you're pregnant and constipated, first: you're in very good company. Up to 40% of pregnant women deal with constipation at some point, thanks to the delightful combination of progesterone slowing your digestive system, prenatal iron supplements backing things up further, and a growing baby pressing on your intestines. The good news is there are safe, effective options — but "safe during pregnancy" narrows the field significantly, and that's exactly what we sorted through for you.

The single most important rule for pregnancy constipation: avoid stimulant laxatives (Dulcolax, Senokot, Ex-Lax, castor oil) unless your OB specifically tells you otherwise. These products force intestinal muscle contractions, and while the risk to pregnancy is theoretical rather than proven, OB-GYNs universally recommend avoiding them when safer alternatives exist.

Why Does Pregnancy Cause Constipation?

Understanding why this is happening helps explain why certain products are recommended:

Progesterone relaxes smooth muscle — including the muscles of your intestines. Your entire digestive tract slows down, meaning stool sits longer and loses more water, becoming harder and more difficult to pass.

Prenatal iron supplements are a major contributor. Iron is constipating even outside of pregnancy. Combined with the progesterone slowdown, iron supplements can turn mild constipation into a significant daily problem.

Physical compression — especially in the second and third trimesters — means the growing uterus physically presses on your intestines, further slowing transit.

Reduced physical activity in later pregnancy contributes as well. Movement stimulates gut motility, and reduced activity means reduced motility.

Dietary changes due to morning sickness, food aversions, and fatigue often reduce fiber and fluid intake — both of which are critical for regularity.

How Did We Choose These Products?

For this guide, we heavily adjusted our standard weights to prioritize safety:

Pregnancy Safety — 40% (the defining criterion — nothing else matters if it's not safe) Effectiveness — 25% (does it actually work for pregnancy-specific constipation?) Tolerability — 20% (will it worsen nausea, bloating, or other pregnancy symptoms?) Ease of Use — 10% (compliance during a time when you have 100 other things to manage) Value — 5%

We consulted OB-GYN guidelines, FDA pregnancy categories, and the American College of Obstetricians and Gynecologists (ACOG) recommendations in making these selections.

What Is the Best Approach During Pregnancy?

Most OBs recommend a layered approach:

Start with diet and water. Aim for 25-30 grams of fiber daily (prunes, pears, beans, whole grains) and at least 8-10 glasses of water. This resolves mild constipation for many women without any medication.

Add Colace if diet alone isn't enough. One capsule twice daily is the standard starting regimen. Give it 3-5 days to take effect.

Add Metamucil (or switch to capsule form) if you need more fiber but food aversions make it hard to eat high-fiber foods. Start with half a dose to minimize gas.

Escalate to MiraLAX with your OB's approval if Colace plus fiber isn't cutting it. Many OBs add MiraLAX for patients in the second and third trimesters who aren't getting relief from softer interventions. The gentlest option versus the best-evidenced one covers that step-up decision, docusate against psyllium covers the softener-plus-fiber pairing most OBs start with, and our MiraLAX pregnancy notes and docusate safety review go deeper on each.

Talk to your OB if none of the above is working after 1-2 weeks. Prescription options exist for severe pregnancy constipation, and hemorrhoid prevention becomes more important as the pregnancy progresses.

Can Changing Iron Supplements Help?

If your prenatal vitamin contains iron and constipation is severe, ask your OB about slow-release iron formulations or taking iron every other day instead of daily. Research shows that every-other-day iron dosing can actually improve absorption while significantly reducing constipation. This one change resolves constipation for some pregnant women entirely, without needing any laxative at all.

Your OB can also check your iron levels — you may not need supplemental iron if your levels are already adequate, in which case switching to an iron-free prenatal eliminates the biggest constipation contributor.