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Casper, WY
A 22-year-old female asked:

How long does it take for milk of magnesia (magnesium hydroxide) to work? i haven't gone in 4 days...

2 doctor answers4 doctors weighed in
Dr. Phillip Goebel
Emergency Medicine 18 years experience
A couple of hours: If it has not worked in a couple of hours you should either take another doe or switch to something like miralax (polyethylene glycol) in combination with enemas.
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Dr. Deborah Ungerleider
Pediatrics 38 years experience
Less than 24 hrs: Usually milk of magnesia (magnesium hydroxide) takes 30 minutes to 6 hours to work, but can be a little longer. It should not take 4 days. I would recommend that you discuss this with your doctor. You may not be drinking enough fluids or you may be too constipated for an oral laxative to work. You can try increasing your fluids and fiber, but also speak to your doctor.
Created for people with ongoing healthcare needs but benefits everyone.

Similar questions

A 39-year-old member asked:

Is milk of magnesia (magnesium hydroxide) safe every 4 days?

1 doctor answer1 doctor weighed in
Dr. Yash Khanna
Family Medicine 59 years experience
Yes is safe: Yes it is safe to take every 4 days.
Created for people with ongoing healthcare needs but benefits everyone.
A 43-year-old member asked:

How much time does it take for milk of magnesia (magnesium hydroxide) to work?

1 doctor answer3 doctors weighed in
Dr. Heidi Fowler
Psychiatry 27 years experience
Milk of magnesia (magnesium hydroxide): Milk of Magnesia (magnesium hydroxide) usually takes effect (leads to a bowel movement ) in half an hour to six hours – but this is variable.
Created for people with ongoing healthcare needs but benefits everyone.
A 35-year-old member asked:

How long should I give milk of magnesia (magnesium hydroxide) to work?

2 doctor answers5 doctors weighed in
Dr. Heidi Fowler
Psychiatry 27 years experience
Milk of magnesia (magnesium hydroxide): Milk of Magnesia (magnesium hydroxide) usually takes effect (leads to a bowel movement ) in half an hour to six hours – but this is variable.
Created for people with ongoing healthcare needs but benefits everyone.
MA
A 19-year-old female asked:

How long does milk of magnesia (magnesium hydroxide) stay in your system ?

1 doctor answer1 doctor weighed in
Dr. Gurmukh Singh
Pathology 51 years experience
Depends: The elimination of this laxative depends on the rate of movement of bowel contents. Under usual circumstances most of it should be out of the GI tract in a couple of days, a week at the most. Unrelated to your question: Practice safe sex. Get HPV vaccine.
Created for people with ongoing healthcare needs but benefits everyone.

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Will milk of magnesia (magnesium hydroxide) still work even if expired?
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Could i take milk of magnesia (magnesium hydroxide) 1 hour after overindulging in food?
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Can someone tell me if milk of magnesia (magnesium hydroxide) is bad to take for constipation?
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Last updated Sep 20, 2019

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