How to Calculate Lactulose 667 mg/mL Dose

This calculator determines the Lactulose dose for treating constipation, using a concentration of Lactulose 667 mg/mL, based on the patient’s weight and dosage regimen:

Dose in mL (based on Lactulose):

Where:

• Weight: Enter the patient’s weight in kilograms (kg) or pounds (lb) and select the unit from the dropdown (automatically converted to kg).
• Dosage Regimen: Select between 1–3 mL/kg/day po once daily or 1–3 mL/kg/day po BID.
• Concentration: Lactulose 667 mg/mL.

Administer as prescribed for constipation. ⚠️ Always consult a healthcare provider.

Using the Lactulose 667 mg/mL Dosage Calculator

Enter the patient’s weight in kilograms or pounds, select the unit, choose the dosage regimen (once daily or BID), and click "Calculate." The calculator provides the dose in mL for pediatric (≥1 year) and adults.

Example: Weight 12.65 kg, 1–3 mL/kg/day po once daily:

Pediatric ≥ 1 year:
12.7 mL to 38 mL PO once daily

Adults:
Usual dose is 15 to 30 mL PO once daily to BID (Maximum 60 mL/day)

Calculations must be re-checked and should not be used alone...
            

Consult a healthcare provider before administering.

Frequently Asked Questions (FAQ)

1. What is Lactulose used for?

Lactulose (Cholac; Generlac; Constulose; Duphalac) is used to treat constipation and hepatic encephalopathy.

2. How often is this given?

Pediatric ≥ 1 year: 1–3 mL/kg/day po once daily or BID (Maximum 60 mL/day). Adults: 15 to 30 mL PO once daily to BID (Maximum 60 mL/day).

3. Can this be used for infants under 1 year?

Consult a doctor, as Lactulose is not typically recommended for infants under 1 year without medical supervision.

4. What if weight is in pounds?

Enter the weight in pounds, and the calculator will automatically convert it to kilograms for calculation (1 lb = 0.4536 kg approximately).

5. What’s the maximum daily dose?

The maximum daily dose is 60 mL/day for both pediatric (≥1 year) and adults.