A patient is prescribed 20 mg of Paroxetine daily. The available tablet strength is 10 mg. How many tablets should be administered?

Choice A reason: Three tablets (30 mg) exceed the prescribed 20 mg, risking Paroxetine overdose. This SSRI increases serotonin levels, and excessive dosing may cause serotonin syndrome, with symptoms like agitation or seizures. Scientifically, precise dosing is critical to avoid disrupting neurotransmitter balance, ensuring safe treatment for depression or anxiety. Choice B reason: Four tablets (40 mg) significantly exceed the prescribed dose, increasing toxicity risk. Paroxetine’s serotonin-enhancing effects can lead to severe side effects, like serotonin syndrome or cardiovascular issues, if overdosed. Scientifically, maintaining therapeutic levels prevents adverse neurological effects, ensuring safe and effective management of mental health conditions. Choice C reason: One tablet (10 mg) underdoses the patient, providing half the required 20 mg. Subtherapeutic Paroxetine levels fail to adequately increase serotonin, reducing efficacy for depression or anxiety. Scientifically, insufficient dosing may leave neural imbalances unaddressed, risking persistent symptoms and poor mental health outcomes. Choice D reason: Two tablets (20 mg) match the prescribed dose, ensuring therapeutic serotonin levels for depression or anxiety management. Scientifically, accurate SSRI dosing optimizes neurotransmitter balance, stabilizing mood without risking toxicity. This supports effective treatment, reducing symptoms like low mood or anxiety through targeted neurochemical modulation.