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Lactulose Syrup

Lactulose Syrup
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Lactulose Syrup (667mg/ml) is a hyperosmotic laxative used to treat constipation, and may also be used to treat encephalopathy by reducing blood ammonia levels. No prescription is required for this product in Canada!


Before taking lactulose:

  • tell your doctor and pharmacist if you are allergic to lactulose or any other drugs.
  • tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially antacids, antibiotics including neomycin (Mycifradin), and other laxatives.
  • tell your doctor if you have diabetes or require a low-lactose diet.
  • tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking lactulose, call your doctor.
  • if you are having surgery or tests on your colon or rectum, tell the doctor that you are taking lactulose.



Usual adult dose for chronic constipation: 15 mL orally once a day.

Usual Adult Dose for acute constipation: 15 mL orally once a day. Therapy should be continued until normal bowel function resumes.

Usual Adult Dose for Hepatic Encephalopathy: initial dose: 30 mL orally 3 times a day or 300 mL in 700 mL water or normal saline as an enema retained for 30 to 60 minutes every 4 to 6 hours. Maintenance dose: 30 to 45 mL orally 3 times a day.

If you have any questions, Kindly complete the provided contact form, and a member of our clinical team will contact you within one business day.

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