Compare Moviprep vs. Miralax

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

Cleans your colon in preparation for a colonoscopy.

Cleans your colon and requires less volume intake than other bowel prep regimens.

Helps get things moving.

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

4.0/ 5 average rating with 226 reviewsforMiralax
  • In studies, Moviprep (polyethylene glycol-electrolyte solution) was as effective as other laxatives for cleansing the colon.
  • Unlike other colonoscopy preps that taste salty, Moviprep (polyethylene glycol-electrolyte solution) is lemon flavored.
  • You drink less fluid with Moviprep (polyethylene glycol-electrolyte solution) compared with other bowel preparations.
  • 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.
  • You may experience common side effects such as abdominal bloating, diarrhea, thirst, dizziness, anal discomfort, and hunger.
  • Has a higher chance of causing sleep problems and serious chills than other colonscopy preparations.
  • 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.
Used for
Dosage forms
  • Powder for reconstitution
  • Liquid
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226 reviews so far
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Side effects
12possible side effects
  • Abdominal bloating
  • Anal discomfort
  • Thirst
  • Nausea
  • Abdominal pain
  • Sleep problems
  • Shaking chills
  • Hunger
  • Flu-like symptoms
  • Vomiting
  • Dizziness
  • Headache
See more detailed side effects
The Miralax (Polyethylene Glycol) FDA package insert doesn’t have numbers about how common side effects are.
Risks and risk factors
  • Electrolyte imbalance
  • Choking or vomiting
    • Swallowing prblems
    • Gastric reflux
  • Red blood cell problems
    • G6PD deficiency
  • Abnormal heartbeats
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