A nurse is managing a client on SSRIs for depression and first-generation antipsychotics for acute psychosis. What potential complication should the nurse prioritize?

Choice A reason: When the amygdala perceives a threat, it signals the hypothalamus to release corticotropin-releasing hormone, which prompts the pituitary gland to secrete adrenocorticotropic hormone. This ultimately triggers the adrenal cortex to release cortisol, a primary stress hormone that increases blood glucose and modulates immune responses to prepare the body for a fight-or-flight reaction.

Choice B reason: Acute stress typically results in a transient decrease or dysregulation of serotonin rather than a therapeutic elevation. Serotonin is primarily involved in mood stabilization and impulse control; the HPA axis activation is specifically geared toward the endocrine stress response involving glucocorticoids and catecholamines, not the immediate elevation of inhibitory neurotransmitters.

Choice C reason: The HPA axis and the sympathetic nervous system work in tandem to mobilize energy during stress. In contrast, the parasympathetic nervous system is responsible for "rest and digest" functions and is suppressed during acute stress to allow for maximal physiological arousal and survival behaviors mediated by the sympathetic branch.

Choice D reason: While the motor cortex may be involved in executing physical responses to stress, its activation is not the direct primary endocrine output of the HPA axis. The HPA axis is a neuroendocrine feedback loop specifically designed for chemical signaling and hormonal regulation throughout the systemic circulation rather than localized neuromuscular motor control.

Choice A reason: Administering 1 tablet would only provide 10 mg of the medication, which is an underdose of 5 mg based on the 15 mg prescription. Subtherapeutic dosing in selective serotonin reuptake inhibitors can lead to inadequate management of depressive symptoms and may prevent the patient from reaching a clinical remission.

Choice B reason: A 0.5 tablet dose provides only 5 mg of fluoxetine, which is one-third of the required 15 mg daily dose. Such a significant underdose is clinically inappropriate and fails to meet the pharmacological requirements for treating major depressive disorder or other labeled indications for this specific antidepressant medication.

Choice C reason: To calculate the dosage, the formula is Dose Ordered / Dose on Hand = Amount to Administer. In this case, 15 mg / 10 mg = 1.5. Therefore, the nurse must administer 1.5 tablets to accurately deliver the 15 mg prescribed by the provider for the patient's daily pharmacological regimen.

Choice D reason: Administering 2 tablets would result in a total dose of 20 mg, which is an overdose compared to the 15 mg prescription. While 20 mg is a common therapeutic dose, the nurse must strictly adhere to the specific 15 mg order to ensure patient safety and dose accuracy.