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: One tablet (37.5 mg) underdoses the prescribed 75 mg. Venlafaxine, an SNRI, modulates serotonin and norepinephrine. Scientifically, insufficient dosing fails to stabilize neural activity, risking persistent depression or anxiety symptoms, as subtherapeutic levels don’t adequately enhance neurotransmitter function, compromising treatment efficacy. Choice B reason: Three tablets (112.5 mg) exceed the prescribed dose, risking toxicity. Venlafaxine overdosing can cause serotonin syndrome or hypertension. Scientifically, excessive SNRI dosing disrupts neurotransmitter balance, leading to adverse effects like agitation or cardiovascular issues, while precise dosing ensures safe and effective mood stabilization. Choice C reason: Four tablets (150 mg) significantly overdose the patient, increasing toxicity risks. Venlafaxine’s effects on serotonin and norepinephrine can cause severe side effects, like seizures, if overdosed. Scientifically, maintaining therapeutic levels prevents neurological and cardiovascular complications, ensuring safe treatment for depression or anxiety. Choice D reason: Two tablets (75 mg) match the prescribed dose, ensuring therapeutic SNRI effects. Scientifically, accurate Venlafaxine dosing optimizes serotonin and norepinephrine modulation, stabilizing mood in depression or anxiety. This prevents symptom persistence or toxicity, supporting effective neural regulation and mental health recovery without adverse effects.