A nurse is reviewing the medical record of a client who is experiencing delirium. Which of the following medications should the nurse identify as a cause of this disorder?

Choice A rationale Sertraline is a selective serotonin reuptake inhibitor (SSRI) commonly used to treat depression and anxiety disorders. While all medications have potential side effects, sertraline is not typically identified as a common precipitating factor for delirium. Delirium is more often associated with anticholinergic effects, which are not primary mechanisms of SSRIs. Choice B rationale Antihistamines, particularly first-generation antihistamines like diphenhydramine, possess significant anticholinergic properties. These anticholinergic effects can lead to central nervous system impairment, causing confusion, disorientation, and cognitive dysfunction, which are hallmarks of delirium, especially in vulnerable populations such as the elderly. Choice C rationale Amphetamines are central nervous system stimulants. While they can cause agitation, psychosis, and exacerbate existing psychiatric conditions, they primarily increase dopamine and norepinephrine activity, leading to heightened arousal and attention. While severe intoxication could resemble delirium, they are not typically categorized as a direct or common cause of delirium in the same way anticholinergics are. Choice D rationale Benzodiazepines, while sometimes used to manage acute agitation in delirium, can paradoxically cause or worsen delirium, particularly in susceptible individuals or with prolonged use. They exert their effects by enhancing GABAergic neurotransmission, leading to sedation and cognitive impairment. Their withdrawal can also precipitate delirium, making their role complex.