A father brings a prescription for lactulose for a 6-month-old infant at 2.5 mL twice daily. Which option is the correct advice?

A father brings a prescription for lactulose for a 6-month-old infant at 2.5 mL twice daily. Which option is the correct advice?

• A. Advise the dose should be doubled for infants.
• B. It should start within 1 hour of taking feed.
• C. Confirm that the prescribed dose is appropriate and that it may take up to 48 hours to act.
• D. Do not use lactulose in infants.

Answer: (C)

Focus on dosing safety and how the drug works in infants. Lactulose is an osmotic laxative that acts in the colon to soften stool by drawing water into the bowel. It’s not immediate; most infants show improvement in stooling patterns within 24–48 hours of starting, though it can take up to a couple of days. The best advice is to confirm that the prescribed dose is appropriate for the infant’s age and size and to tell the caregiver that it may take up to 48 hours to have an effect. This covers both ensuring safe, suitable dosing and setting realistic expectations for onset of action. Doubling the dose without medical guidance isn’t appropriate, because higher doses raise the risk of diarrhea and dehydration. Starting within 1 hour of feeding isn’t a standard consideration for this medication, and lactulose isn’t contraindicated in infants when constipation is being treated. It’s appropriate to use under supervision, with dose checks and monitoring.

Focus on dosing safety and how the drug works in infants. Lactulose is an osmotic laxative that acts in the colon to soften stool by drawing water into the bowel. It’s not immediate; most infants show improvement in stooling patterns within 24–48 hours of starting, though it can take up to a couple of days.

The best advice is to confirm that the prescribed dose is appropriate for the infant’s age and size and to tell the caregiver that it may take up to 48 hours to have an effect. This covers both ensuring safe, suitable dosing and setting realistic expectations for onset of action.

Doubling the dose without medical guidance isn’t appropriate, because higher doses raise the risk of diarrhea and dehydration. Starting within 1 hour of feeding isn’t a standard consideration for this medication, and lactulose isn’t contraindicated in infants when constipation is being treated. It’s appropriate to use under supervision, with dose checks and monitoring.