Compare lactulose vs. Fibercon

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

Relieves constipation and gets rid of ammonia in people with liver problems.

Generlac (lactulose) relieves constipation and high ammonia levels, but it can take up to 48 hours to work.

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.

3.0/ 5 average rating with 80 reviewsforFibercon
Upsides
  • Generlac (lactulose) is the first-choice treatment for brain conditions caused by high ammonia levels.
  • Can be used if you have severe chronic constipation leading to blockage.
  • Available in generic.
  • Can be taken orally or rectally.
  • 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
  • Should not be used if you are on a galactose-restricted diet.
  • Does not provide rapid relief of constipation. Talk to your doctor or pharmacist if you need quick relief.
  • Generlac (lactulose) has a very sweet flavor that most people don't like.
  • 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
  • Powder
  • Pill
Price
No pricing information available
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Reviews
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80 reviews so far
45%
saidit'sworth it
28%
saiditworked well
21%
saidit'sa big hassle

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Side effects
The Generlac (lactulose) 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 risk factors
  • Mineral imbalances
    • Taking Generlac (lactulose) for more than 6 months
    • Elderly
    • Taking medications that cause mineral imbalance
    • Not exercising regularly
  • Increased blood sugar
    • Diabetes
  • Problems during colonoscopy
See more detailed risks and warnings
  • Drug interactions
    • Taking with calcium supplements
    • Taking with oral bisphosphonates
  • 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