how fast does miralax powder work

MiraLAX powder usually starts working in 1 to 3 days for constipation, though some people may notice a bowel movement sooner or a bit later. It does not usually work right away like a stimulant laxative.

What to expect

• It works by drawing water into the stool, which makes it softer and easier to pass.

• You may not feel immediate relief after the first dose.

• If it’s being used for colonoscopy prep with other medicines, it can work much faster.

Simple usage note

The usual over-the-counter dose is 17 grams once daily mixed into a drink, and taking more than recommended does not make it work faster. Drinking enough fluids can help it work better.

When to get help

If constipation lasts more than a few days, or MiraLAX isn’t helping after several doses, it’s a good idea to check with a clinician.