Which statement about anticholinergic drugs and older adults is true?

• A. They have no adverse effects in older adults
• B. They are rapidly eliminated with no brain penetration
• C. They are more sensitive to central nervous system effects due to aging
• D. They affect only peripheral targets

Answer: (C)

Older adults are more sensitive to central nervous system effects from anticholinergic drugs because aging reduces brain cholinergic reserve and alters how these drugs are handled by the body. Anticholinergic agents block acetylcholine, which plays a key role in attention, memory, and arousal. In the aging brain, this blockade is more likely to produce confusion, delirium, agitation, and cognitive decline. Plus, aging can change pharmacokinetics and pharmacodynamics—the blood–brain barrier may be more permeable and drug clearance can be slower—so the central effects linger longer and are more pronounced. This heightened CNS vulnerability is why even standard doses can lead to adverse effects in older adults, especially with multiple medications that contribute to anticholinergic burden.

These statements do not fit: anticholinergic drugs do have adverse effects in older adults; many are not rapidly eliminated with no brain penetration, and they do not affect only peripheral targets but also central nervous system receptors. In practice, this means clinicians should minimize anticholinergic exposure in the elderly and monitor for cognitive changes when such meds are used.