Compare Dulcolax vs. lactulose

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



Treats constipation. Dulcolax (Bisacodyl) works fast and the suppositories work even faster to relieve your constipation, as long as you're okay with it "cramping" your style a bit.Coming soon.
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Reviews & ratings
Filter group. All currently selected
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Reviews for Dulcolax (Bisacodyl)
of people say Dulcolax (Bisacodyl) is worth it
say it works well
say it's a big hassle
156 reviews

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Side effects

We haven’t found good data for Dulcolax side effects.

FDA side effect reports for Dulcolax »

We haven’t found good data for lactulose side effects.

FDA side effect reports for lactulose »
How it works
Dulcolax (Bisacodyl) is a stimulant laxative that you can take by mouth or in a suppository. It causes waves of contractions (peristalsis) in your intestine muscles to push stool through. It also makes stool more watery.Coming soon.
Type of medication
Coming soon.
Available as
  • Pill
  • Suppository
  • Liquid
Used for (click to learn more)
  • Constipation Hepatic encephalopathy; Treatment and Prophylaxis
Risk factors for serious side effects
  • Age 60 or older
  • Malignancy
  • Other condition that causes blockage or narrowing of bowel
  • Taking medications that cause constipation
  • Age 60 or greater
  • Taking medications that cause constipation
  • People who can't walk or move well (immobility)
  • Women of childbearing age
Detailed Dulcolax (Bisacodyl) risks & warnings »
Coming soon.
Pregnancy category
CFDA pregnancy category (Weigh risks vs. benefits)

Research studies with animals found harmful effects on unborn babies. It hasn’t been properly studied in humans. The benefits might outweigh the risks even if you’re pregnant. Talk with your doctor.

See the FDA package insert
BFDA pregnancy category (Probably safe)

Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

See the FDA package insert
No specific alcohol-related info.No specific alcohol-related info.
  • Talk to you doctor about eating certain foods and getting more exercise to help prevent your constipation.
No specific food-related info.
Kidneys and liver
No specific kidneys and liver-related info.No specific kidneys and liver-related info.
No specific sex-related info.No specific sex-related info.
No specific sleep-related info.No specific sleep-related info.
No specific weight-related info.No specific weight-related info.
Upsides and benefits
  • Most people said it was worth taking and it wasn't too much of a hassle.
  • Tablets give overnight relief of your constipation.
  • Dulcolax can also be used to treat constipation caused by spinal cord injury.
  • Suppositories give you quick relief without having to drink a large amount of liquid medicine.
Coming soon.
Downsides and risks
  • Dulcolax can cause cramping, stomach upset, feeling faint, and the feeling that you "have to go right now".
  • You have to be comfortable with putting the medicine in your rectum.
  • Suppositories can cause slight rectal burning.
Coming soon.
Tips from our pharmacists for people taking the medication
  • Swallow tablets whole (don't chew or crush) at bedtime, but not for more than one week.
  • Tablet works in 6 to 12 hours. Suppository works in 15 minutes to an hour, so make sure you're near a bathroom.
  • Don't take tablets within 1 hour of taking antacids, milk or dairy products.
  • Be sure to remove the wrapper from the suppository before inserting it into your rectum.
  • Ask your doctor about giving Dulcolax to anyone younger than 6 years.
  • Don't take if you have stomach pain, nausea, vomiting, or had sudden changes in your stool for more than 2 weeks.
  • Check with your baby doctor before using or if you're breast-feeding.
  • Talk to you doctor about eating certain foods and getting more exercise to help prevent your constipation.
Coming soon.
Learn more
More about DulcolaxSide effectsReviews & ratingsAlternativesFDA package insert
More about lactuloseSide effectsReviews & ratingsFDA package insert