Which statement about the common OTC stool softener docusate sodium is correct?

• A. Docusate sodium; avoid if bowel obstruction or prolonged use without medical advice.
• B. Lactulose; generally safe for constipation in adults.
• C. Magnesium citrate; can accumulate in CKD.
• D. Psyllium husk; may interact with other medications.

Answer: (A)

Stool softeners like docusate sodium are emollients that soften stool by letting water mix with fats in the stool, making it easier to pass without increasing bowel movements. The important safety point is to avoid using docusate if a bowel obstruction is suspected, because softening stool won’t relieve a blockage and could delay diagnosis or treatment. Also, prolonged use without medical advice isn’t recommended because needing a laxative for an extended period can signal an underlying issue and may lead to complications or dependence.

The other options describe different laxatives: lactulose is an osmotic laxative, not the stool softener in question; magnesium citrate is a saline laxative that can accumulate in chronic kidney disease; psyllium husk is a bulk-forming laxative that can interact with certain medications.