Is MiraLAX safe during pregnancy?

What does the evidence say about MiraLAX during pregnancy?

1. MiraLAX (polyethylene glycol) stays mostly in your gut and is not well absorbed into your bloodstream, so very little of it is likely to reach your baby. 1
2. Over-the-counter laxatives like polyethylene glycol have not been linked to a higher chance of birth defects when used at the recommended dose. 1
3. Polyethylene glycol caused less diarrhea, vomiting, and loose stools than lactulose in a randomized trial of pregnant women in their third trimester. 2
4. Polyethylene glycol eased constipation faster than lactulose in another randomized trial of pregnant women, with a clear difference showing up by the second week. 3
5. Magnesium itself has a natural, osmotic laxative-like effect in the gut, which is one reason many people try a magnesium-rich diet or supplement before adding a dedicated laxative like MiraLAX. 4

Is MiraLAX safe in each trimester?

• First trimester. Constipation often shows up early, as rising hormones, new prenatal vitamins, and less fluid from morning sickness all slow digestion down. Most people start with more water, fiber, and short walks before trying any laxative. If you need more help, MiraLAX is a reasonable next step, but check timing and dose with your provider first.
• Second trimester. As your uterus grows and iron needs go up, constipation can get harder to manage with diet changes alone. Since magnesium itself has a gentle, natural laxative effect, some people try magnesium-rich foods or a supplement before moving on to a dedicated product like MiraLAX. Confirm what fits your situation with your provider.
• Third trimester. Extra pressure from the baby's growing weight makes constipation especially common in the third trimester. MiraLAX is often continued through this stretch if it has been working well, and its low absorption is one reason it is generally reached for before a stimulant laxative. Mention any regular laxative use to whoever is managing your delivery.