Compare Miralax vs. Fibercon

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

Miralax (Polyethylene Glycol)

Over-the-counter
Helps get things moving.

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

5.5/ 7 average rating with 226 reviewsforMiralax
Helps get things moving.

Fibercon (Calcium Polycarbophil) is a natural fiber laxative that's safe enough to take during pregnancy. Just make sure you take it with plenty of liquid.

4.0/ 7 average rating with 80 reviewsforFibercon
Upsides
  • 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.
  • Some people felt Fibercon was a hassle but still worth it.
  • It's safe to use short-term during pregnancy and breast-feeding as long as you take it with plenty of liquid, but you should still check with your baby doctor first.
  • Less gas and bloating compared to psyllium laxative products.
Downsides
  • 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.
  • You may have to take Fibercon daily for 1-3 days to see full effects.
  • If you don't take it with enough liquid, it could swell and block your throat and cause choking.
  • Not the best choice for people who have swallowing problems or aren't able to drink lots of liquids.
  • Can cause heartburn, gas, and belly cramps.
Used for
Dosage forms
  • Liquid
  • Pill
No pricing information available
No pricing information available
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Reviews
226 
75%
think this treatment is worth it
54%
think this treatment works well
10%
think this treatment is a hassle

Have you used Miralax (Polyethylene Glycol)?

Leave a review
80 
45%
think this treatment is worth it
28%
think this treatment works well
21%
think this treatment is a hassle

Have you used Fibercon (Calcium Polycarbophil)?

Leave a review
Side effects
The Miralax (Polyethylene Glycol) FDA package insert doesn’t have numbers about how common side effects are.
The Fibercon (Calcium Polycarbophil) FDA package insert doesn’t have numbers about how common side effects are.
Risks and warnings
  • Electrolyte imbalance

    Taking with medications that cause electrolyte imbalance

    ...and 1 more risk factors

  • Risk to fetus

    Women of childbearing age

  • Bowel blockage

    Age 60 or older

    ...and 3 more risk factors

See more detailed risks and warnings
  • Drug interactions

    Taking with calcium supplements

    ...and 1 more risk factors

  • Bowel blockage

    Age 60 or older

    ...and 3 more risk factors

See more detailed risks and warnings