Compare Benefiber vs. Miralax

Head-to-head comparisons of medication uses, side effects, ratings, and more.

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Benefiber

Over-the-counter
Supplements fiber and relieves constipation.

Benefiber is an excellent fiber supplement. It's easy to use and doesn't clump up like other supplements.

Helps get things moving.

Miralax (Polyethylene Glycol) provides effective relief of constipation without "cramping" your style.

4.0/ 5 average rating with 226 reviewsforMiralax
Upsides
  • Research shows soluble fibers like Benefiber are useful for people who don’t meet daily fiber recommendations.
  • Benefiber completely dissolves in liquids and doesn’t have a gritty texture like other similar fiber supplements.
  • Comes in multiple forms, including chewables, powders, and caplets.
  • Should cause less gas and bloating than other fiber supplements.
  • Has multiple health benefits including lower blood sugar and cholesterol levels.
  • Miralax is the most recommended laxative by pharmacists and doctors.
  • Most people felt it was worth the hassle.
  • It's gluten and sugar free.
  • It causes little to no cramping, bloating, gas, or feelings like you "have to go right now" compared to some other medicines to treat constipation.
  • Works differently than other over-the-counter laxatives so it's a great alternative if other medicines haven't worked.
Downsides
  • If you have a gluten intolerance, celiac disease, are pregnant, or are nursing, check with your doctor before taking Benefiber.
  • Taking too much Benefiber can cause constipation, gas, and bloating.
  • Benefiber doesn’t bulk up stool as much as insoluble fiber supplements.
  • Some people's bodies can become dependent on fiber supplements.
  • You have to dissolve Miralax in a beverage and drink it versus taking a pill.
  • It's not for children 16 years or younger.
  • Miralax doesn't work overnight. It can take up to 2-4 days to have a bowel movement.
  • It's not recommended that you take it for more than a week, so it you haven't had any success, you'll need to call your doctor for other laxative options.
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Used for
Dosage forms
  • Liquid
  • Pill
  • Chewable tablet
  • Liquid
Price
No pricing information available
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Reviews
Not enough review data.Leave a review
226 reviews so far
75%
saidit'sworth it
54%
saiditworked well
10%
saidit'sa big hassle

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Side effects
The Benefiber FDA package insert doesn’t have numbers about how common side effects are.
The Miralax (Polyethylene Glycol) FDA package insert doesn’t have numbers about how common side effects are.
Risks and risk factors
  • Warnings
    • Pregnant
    • Nursing
    • Kidney stones
  • Fiber intake
  • Medication interactions
See more detailed risks and warnings
  • Electrolyte imbalance
    • Taking with medications that cause electrolyte imbalance
    • Age 60 or older
  • Risk to fetus
    • Women of childbearing age
  • Bowel blockage
    • Age 60 or older
    • Malignancy
    • Other condition that causes blockage or narrowing of bowel
    • Taking medications that cause constipation
See more detailed risks and warnings