What is Lactulose: Uses, Warnings & Interactions

Updated Jan 13, 2021  •  Published Dec 30, 2020

Lactulose overview

BRAND NAMES:

  • Constulose, Enulose, Generlac, Kristalose

Generic Names:

  • Lactulose

Uses:

  • Treats constipation. Also treats problems caused by liver disease.

Therapeutic Classes:

  • Gastrointestinal Agent, Laxative, Hyperosmotic

Forms:

  • Liquid

How it’s taken:

  • By mouth

What is Lactulose used for?

Lactulose is a prescription-only synthetic sugar medication that is used to relieve constipation. When taken, Lactulose is broken down within the colon to soften the stool. This medication is available as an oral solution and oral syrup.

What form(s) does Lactulose come in

  • Liquid

What are common Lactulose doses?

  • Bottle 237ML of 10GM/15ML

  • Bottle 473ML of 10GM/15ML

  • Bottle 946ML of 10GM/15ML

  • Cup 15ML of 10GM/15ML

  • Cup 30ML of 10GM/15ML

  • Cup 30ML of 20GM/30ML

  • Packet 10GM

Common Lactulose prescriptions

  • Lactulose
    1892ml of 10gm/15ml bottle

  • Lactulose
    236ml of 10gm/15ml bottle

  • Lactulose
    237ml of 10gm/15ml bottle

  • Lactulose
    473ml of 10gm/15ml bottle

  • Lactulose
    500ml of 10gm/15ml bottle

  • Lactulose
    946ml of 10gm/15ml bottle

  • Lactulose
    10gm packet

How to take Lactulose

  • Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.

  • To make this medicine taste better, you may mix it with water, milk, or fruit juice.

  • Your doctor will tell you how much medicine to use. Do not use more than directed.

  • Missed dose: Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

  • To make this medicine taste better, you may mix it with water, milk, or fruit juice.

  • Missed dose: Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

  • Your doctor will tell you how much medicine to use. Do not use more than directed.

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

  • Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.

Lactulose contraindications

  • This medicine is not right for everyone. Do not use it if you are following a diet low in lactose or galactose.

Lactulose warnings

  • Tell your doctor that you are taking lactulose before you have any medical tests or surgery on your colon or rectum.

  • Tell your doctor if you are pregnant or breastfeeding, or if you have diabetes.

  • When you first take lactulose, it may take 24 to 48 hours before you have a normal bowel movement.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Lactulose interactions

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

  • Tell your doctor that you are taking lactulose before you have any medical tests or surgery on your colon or rectum.

  • When you first take lactulose, it may take 24 to 48 hours before you have a normal bowel movement.

  • Some medicines can affect how lactulose works. Tell your doctor if you are using antacids or antibiotics, such as neomycin.

Lactulose side effects

Serious Side Effects

  • Stomach pain or cramps

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

  • Severe diarrhea

Less Serious Side Effects

  • Gas or burping

  • Nausea, vomiting, mild diarrhea

  • Stomach pain or cramps