A patient is prescribed 75 mg of Venlafaxine once daily. The available tablet strength is 37.5 mg. How many tablets should be administered?

Choice A reason: Lithium 300 mg twice daily totals 600 mg daily. With 150 mg tablets, 600 ÷ 150 = 4 tablets daily. This ensures therapeutic serum levels for mood stabilization in bipolar disorder. Scientifically, accurate dosing maintains lithium’s effect on neurotransmitter balance, preventing manic or depressive episodes without risking toxicity.

Choice B reason: Two tablets (300 mg) provide only half the daily dose (600 mg), leading to subtherapeutic levels. Lithium stabilizes mood by modulating serotonin and norepinephrine. Underdosing risks breakthrough manic or depressive episodes, as insufficient levels fail to regulate neural excitability, compromising bipolar disorder management and patient stability.

Choice C reason: Six tablets (900 mg) exceed the prescribed 600 mg, risking lithium toxicity. High doses can disrupt electrolyte balance, causing neurological or renal complications. Scientifically, lithium’s narrow therapeutic index requires precise dosing to avoid adverse effects like tremors or confusion, ensuring safe mood stabilization in bipolar disorder.

Choice D reason: Eight tablets (1200 mg) far exceed the prescribed dose, significantly increasing toxicity risk. Lithium toxicity affects renal and neurological function, potentially causing seizures or coma. Scientifically, excessive dosing disrupts electrolyte homeostasis, overwhelming the body’s ability to metabolize lithium, leading to severe adverse effects in bipolar disorder treatment.

Choice A reason: Immediate psychiatric referral without engagement skips assessment, risking inappropriate care. PTSD involves amygdala-driven hyperarousal, requiring initial stabilization. Scientifically, bypassing patient interaction may delay addressing specific trauma triggers, leaving neurobiological stress responses, like cortisol spikes, unmanaged, hindering effective PTSD recovery.

Choice B reason: Discussing triggers extensively risks re-traumatization, intensifying flashbacks. Scientifically, premature focus on triggers heightens amygdala activity and cortisol, worsening PTSD symptoms. Stabilization through a calm environment is needed first to regulate emotional responses, ensuring readiness for trigger-focused therapy later in treatment.

Choice C reason: A calm environment and reassurance reduce hypervigilance and flashbacks by lowering amygdala activity. Scientifically, this stabilizes cortisol levels, promoting emotional regulation in PTSD. Creating safety mitigates trauma’s neurobiological impact, fostering trust and supporting initial recovery by preventing escalation of stress-related symptoms.

Choice D reason: Encouraging exposure to similar scenarios is premature, risking severe distress. Scientifically, uncontrolled exposure heightens amygdala-driven fear responses, exacerbating PTSD symptoms like flashbacks. Structured exposure therapy requires stabilization first, as premature desensitization can overwhelm coping mechanisms, delaying psychological recovery.