Which GI antispasmodic is inappropriate for older adults due to strong anticholinergic activity?

• A. Atropine
• B. Dicyclomine
• C. Scopolamine
• D. Hyoscyamine

Answer: (B)

The key idea is that older adults are especially sensitive to anticholinergic effects, and medications with strong antimuscarinic activity can trigger delirium, confusion, and other anticholinergic side effects.

Dicyclomine has relatively strong anticholinergic (antimuscarinic) activity among GI antispasmodics. Because it blocks acetylcholine at muscarinic receptors, it can cause cognitive impairment, confusion, dry mouth, constipation, urinary retention, and other anticholinergic adverse effects. In older patients, these risks are magnified due to age-related changes, polypharmacy, and reduced homeostatic reserve, making dicyclomine particularly inappropriate in this population.

The other agents listed also have anticholinergic properties, but the concern is typically greatest with dicyclomine in the GI antispasmodic class for older adults, thus aligning with the choice that emphasizes strong anticholinergic burden.