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Lactulose

This form:

Pronounced

"LACK-tew-lohss"

Common brand names:

Cephulac

Uses

This drug is used by mouth or rectally to treat or prevent complications of liver disease (hepatic encephalopathy). It does not cure the problem, but may help to improve mental status. Lactulose is a colonic acidifier that works by decreasing the amount of ammonia in the blood. It is a man-made sugar solution.

Other Uses

This section contains uses of this drug that are not listed in the approved professional labeling for the drug, but may be prescribed by your health care professional. Use this drug for a condition that is listed in this section only if has been so prescribed by your health care professional.

The form of this drug that is taken by mouth may also be used for constipation.

How to Use This Medication

If you are taking this medication by mouth for liver disease, take it as directed by your doctor, usually 3 to 4 times a day. To improve the taste, you may mix it into fruit juice, water, milk, or a soft dessert. The goal is to have 2 to 3 soft stools each day. The dosage is based on your medical condition and response to treatment (for example, the number of soft stools each day).

If you are taking this medication by mouth for constipation, take it as directed by your doctor, usually once daily.

This medication can also be given rectally as an enema for liver disease. Mix the recommended amount of lactulose with 700 milliliters (24 ounces) of water or normal saline. Give the solution into the rectum and keep the liquid inside for 30 to 60 minutes as directed by your doctor. If you keep the enema inside for less than 30 minutes, repeat the dose unless directed otherwise.

Use this medication regularly in order to get the most benefit from it. Remember to use it at the same time each day.

When this drug is given rectally for liver disease, an improvement in your mental status may occur in as little as 2 hours, but if you are taking this medication by mouth, it may take up to 24 to 48 hours. If you are using this medication for constipation, it may take up to 48 hours to have a bowel movement. Tell your doctor if your condition lasts or gets worse.

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Drug information is selected from data included with permission and copyrighted by First DataBank, Inc. This is a summary and does not contain all possible information about this product. For complete information about this product or your specific health needs, ask your healthcare professional. Always seek the advice of your healthcare professional if you have any questions about this product or your medical condition. This information is not intended as individual medical advice and does not substitute for the knowledge and judgment of your healthcare professional. This information does not contain any assurances that this product is safe, effective or appropriate for you.

This information is intended only for residents of the United States. Products sold under the same brand names in other countries may contain different ingredients.

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Information expires December 2025.