A nurse is caring for a client with post-traumatic stress disorder (PTSD) who reports frequent nightmares. Which medication is most likely to be prescribed to address this symptom?

Choice A reason: Lorazepam, a benzodiazepine, reduces anxiety via GABA enhancement but is not specifically indicated for PTSD-related nightmares. It carries a risk of dependence and may worsen sleep architecture, making it less effective for this symptom compared to targeted medications. Choice B reason: Prazosin, an alpha-1 adrenergic blocker, reduces norepinephrine-driven hyperarousal in PTSD, significantly decreasing nightmare frequency and intensity. It targets the sympathetic nervous system’s role in PTSD sleep disturbances, making it the most effective choice for this symptom. Choice C reason: Fluoxetine, an SSRI, treats PTSD symptoms like depression and anxiety by increasing serotonin levels. While effective for overall PTSD management, it is less specific for nightmares compared to prazosin, which directly targets sleep-related hyperarousal. Choice D reason: Lithium is used for bipolar disorder to stabilize mood via neurotransmitter modulation. It does not specifically address PTSD nightmares, which are driven by hyperarousal, making it an ineffective choice compared to prazosin’s targeted action on nightmares.