Is Miralax Laxative Powder Safe During Pregnancy? (Updated 2026 Guide)
Updated February 25, 2026
Miralax Laxative Powder
Miralax
Yes, Miralax is safe during pregnancy. It receives an A grade because its active ingredient, polyethylene glycol 3350, is minimally absorbed by the body and works locally in the intestines to relieve constipation without affecting your baby.
Go ahead and use it. Nothing to worry about here.
Pregnancy Safe is 100% independent and research driven. No companies pay to promote or sponsor products.
What Ingredients Are in Miralax Laxative Powder?
Miralax Laxative Powder has 1 ingredients. All 1 ingredients are considered safe for pregnancy.
polyethylene glycol 3350
SAFE
Polyethylene glycol 3350 is a laxative used to treat occasional constipation by increasing water in the intestines to promote bowel movements. Polyethylene glycol 3350 is minimally absorbed systemically and is considered safe during pregnancy for short term relief of constipation.
Answering Your Questions
How much Miralax Laxative Powder is safe during pregnancy?
The standard dose is 17 grams (about one capful) mixed into 4-8 ounces of any beverage. Do not exceed the recommended dose unless directed by your healthcare provider.
Can you use Miralax Laxative Powder daily while pregnant?
Miralax can be taken once daily for up to 7 days. If constipation persists beyond a week, consult your doctor before continuing use during pregnancy.
Is Miralax safe while breastfeeding?
Yes, Miralax is considered safe while breastfeeding. Polyethylene glycol 3350 is not absorbed into the bloodstream in significant amounts, so it does not pass into breast Milk.
What are pregnancy safe alternatives to Miralax?
Other pregnancy safe options include stool softeners like Colace (docusate sodium), fiber supplements like Metamucil, and natural remedies such as increasing water intake, eating high fiber foods, and regular physical activity.
Why does Miralax get an A grade?
Miralax receives an A grade because its only active ingredient, polyethylene glycol 3350, is an osmotic laxative that works locally in the intestines and is minimally absorbed by the body, making it one of the safest laxative options during pregnancy.
How long does it take for Miralax to work?
Miralax typically produces a bowel movement within 1 to 3 days. It works gradually by drawing water into the colon to soften stool, so don't expect immediate results like with stimulant laxatives.
What are the side effects of Miralax?
Common side effects include bloating, gas, cramping, and nausea. These are usually mild and temporary. If you experience severe diarrhea or allergic reactions, stop use and contact your healthcare provider.
Can you take Miralax every day during pregnancy?
Miralax is approved for daily use up to 7 days without a doctor's supervision. For longer term use during pregnancy, consult your healthcare provider to ensure it's appropriate for your situation.
What gentle laxatives are safe during pregnancy?
Osmotic laxatives like Miralax and stool softeners like Colace are considered the safest options during pregnancy. Stimulant laxatives should generally be avoided unless recommended by your doctor.
What Are Pregnancy Safe Alternatives to Miralax Laxative Powder?
Here are some solid alternatives. Everything below has an A or B grade, meaning no flagged ingredients in our database.
| Grade | Product | Brand | Type |
|---|---|---|---|
| A | Miralax | — | laxative |
| A | Ex-lax Regular Strength Stimulant Laxative Chocolated Pc - 48ct | Ex-lax | laxative |
| A | Laxative Gummies | Senokot | laxative |
| A | Dulcolax Gentle And Predictable Fast Relief Laxative Suppositories - 28ct | Dulcolax | laxative |
Are Other Miralax Products Safe During Pregnancy?
We looked at 6 other Miralax products. 4 are pregnancy safe (A or B grade), while 2 need a closer look.
| Grade | Product | Type |
|---|---|---|
| A | Miralax 14 Dose Unflavored Powder | — |
| A | Miralax Gentle Constipation Relief 7 Doses | — |
| A | Miralax Gentle Constipation Relief Laxative Powder | — |
| A | Miralax Gentle Constipation Relief Polyethylene Glycol 3350 Laxative Powder Unflavored | — |
How Does Miralax Laxative Powder Compare to Other Laxatives?
We graded 20 Laxatives for pregnancy safety. Here's how they stack up:
Miralax Laxative Powder earns a A grade, placing it among the top of Laxatives. Only 25% of products in this category get an A grade, so it pays to choose carefully.
How Do We Score Products for Pregnancy Safety?
We analyze each product's ingredients and category to flag known risks and provide cautionary notices for general category safety concerns.
A - Safe
Excellent choice! All ingredients are considered safe during pregnancy.
What to do: Use with confidence.
B - Likely Safe
Pretty much safe with very minimal risk. Some ingredients may have limited pregnancy studies, but no significant safety concerns have been identified.
What to do: Use with confidence.
C - Limit
Contains ingredients with some pregnancy considerations. Research shows these ingredients may have limited safety data, potential for minor hormonal effects, or require caution based on animal studies.
What to do: Use sparingly and consider safer alternatives when available.
D - Caution
Similar to C grade but contains multiple cautionary ingredients. The combination increases overall concern.
What to do: Try to avoid if that makes you feel better. If you've already used it, no need to panic.
F - Avoid
Contains ingredients with established risks during pregnancy. Research shows these can cause birth defects, developmental harm, or serious maternal complications.
What to do: Do not use during pregnancy. If you've already used it, don't worry - contact your OBGYN if concerned.
