Which of the following laxatives is used in the form of a suppository?

Appeared in: BTSC 3 August 2025

Explanation

Bisacodyl is classified as a stimulant laxative.
It is available in both oral tablet and rectal suppository formulations.
The suppository form provides rapid relief from constipation, typically inducing a bowel movement within 15 to 60 minutes by directly stimulating the colonic nerves.
This makes it a common choice when a quick evacuation is needed.

Option B: Docusate sodium is a stool softener, not a stimulant. Its primary rectal formulation is an enema, not a solid suppository.
Option C: Lactulose is an osmotic laxative available as an oral syrup. While it can be given rectally as a liquid enema for hepatic encephalopathy, it is not formulated as a solid suppository for constipation.
Option D: Psyllium is a bulk-forming laxative that must be taken orally with plenty of water. It is a powder or wafer and is never administered rectally.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Formulations and Routes of Administration for Common Laxatives as background academic context rather than a clinical decision trigger.
Nurses must educate patients on the correct administration of suppositories, including proper positioning (Sims' position) and insertion technique to ensure effectiveness and patient comfort.
Choosing the right laxative is crucial. Stimulant suppositories like bisacodyl are for acute, rapid relief, whereas bulk-forming agents like psyllium are better for long-term management of chronic constipation.
Overuse of stimulant laxatives can lead to electrolyte imbalances and dependency. Nurses should assess bowel habits and advise non-pharmacological measures like diet, fluids, and exercise first.

How to Approach the Question

First, identify the key terms in the question: 'laxative' and 'suppository'. The question asks to identify which of the listed drugs is available in a suppository form.
Review each option and recall its classification and common formulations.
Consider Bisacodyl. Recall that it is a stimulant laxative known for its fast-acting suppository form.
Consider Docusate sodium. Recall it's a stool softener, usually given orally or as an enema.
Consider Lactulose. Recall it's an osmotic laxative, administered as an oral syrup.
Consider Psyllium. Recall it's a bulk-forming agent, taken orally as a powder mixed with liquid.

Concept Tested & Keywords

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E6 Pharmacology Nursing Lilley 11e Part 3 p. 179-181

E6 Pharmacology Katzung 16e p. 1707-1709

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