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A 36-year-old member asked:

how long does it take for miralax (polyethylene glycol) to work?

1 doctor answer1 doctor weighed in
Dr. Ryan Phasouk
Family Medicine 18 years experience
1-3 days: The onset of MiraLAX (polyethylene glycol) is usually 1-3 days. Remember, it is an osmotic agent that draws water into the stool and hence makes it easier to have a bowel movement.

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Similar questions

A 31-year-old member asked:

Can you explain how miralax (polyethylene glycol) works?

2 doctor answers2 doctors weighed in
Dr. Andrew Gentry
Gastroenterology 20 years experience
Osmotic laxative: If you remember from science class putting sugar or other dry compound in small amount of water and placing it in lager container of tap water the tap water would cross the plastic bag and dilute the sugar water......Miralax (polyethylene glycol) is an osmotic laxative it prevents water from being absorbed in the gastrointestinal tract thereby getting more water to the anus vice a dry poop.
A 32-year-old member asked:

How long will it take for miralax (polyethylene glycol) to work usually?

3 doctor answers7 doctors weighed in
Dr. Peter Kurzweil
Internal Medicine 50 years experience
Hours to days.: Miralax (polyethylene glycol) works by absorbing water from the colon allowing it to move easier through the bowel and pass the stool. It probably needs to be taken daily to be effective . It is not like milk of magnesia or citrate of mnagnesia, which should only take few hours to be effective.
A 41-year-old member asked:

How long does miralax (polyethylene glycol) take to work?

1 doctor answer1 doctor weighed in
Dr. Ryan Phasouk
Family Medicine 18 years experience
1-3 days: Miralax (polyethylene glycol) can take 1 to 3 days to work before effective. Remember that this is not a stimulant laxative.
A 35-year-old member asked:

How long will it take for miralax (polyethylene glycol) to work?

1 doctor answer1 doctor weighed in
Dr. Philip Gasseling
Pediatrics 48 years experience
Few days: not really laxative to induce bowel contractions but a nonabsorbable material that cause the stools to become softer, and lubricates the bowel to cause easier passage of stool
Abingdon, VA
A 38-year-old female asked:

How long does it take miralax (polyethylene glycol) to work? I've been taking it since thursday, march 6, with no results.

1 doctor answer4 doctors weighed in
Dr. Charles Cattano
Gastroenterology 39 years experience
Dose-dependent: The more MiraLAX (polyethylene glycol) you take the faster it works. As a once over-the-counter dosed laxative you may not see results for 3-4 days, but as a multi-dosed colonoscopy preparation (when used under doctor's advice) expect laxation within hours. As with any laxative however understand its mechanism of action, its risks, ; treatment goals ; make sure you are not missing obstruction, dysmotility, inflammation.

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Last updated Jul 15, 2020
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