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Lactulose counselling — GPhC CRA MCQ

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EasyGastro-intestinal TherapeuticsLactulose counsellingGPhC CRA

A 63-year-old woman is prescribed lactulose 15mL twice daily for constipation after starting amitriptyline. She asks when it will work because she expected a result within an hour. She has no abdominal pain or vomiting. What would you advise the patient?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: E — It may take up to 48 hours and should be taken regularly with fluids

Lactulose is an osmotic laxative and may take 1 to 2 days to work. Regular use and adequate fluid intake improve effectiveness and tolerability. It is not intended for immediate relief within minutes. Red-flag symptoms such as vomiting or severe pain would change the advice.

Reference: BNF Lactulose; NICE CKS Constipation