A patient is prescribed 150 mg/day of Lithium, divided into two equal doses. How much Lithium should be given per dose?
150 mg.
75 mg.
50 mg.
100 mg.
The Correct Answer is B
Choice A reason: Giving 150 mg in one dose would mean the full daily dose is administered at once, not divided as ordered.
Choice B reason: The total daily dose is 150 mg. Dividing this into two equal doses means 150 ÷ 2 = 75 mg per dose.
Choice C reason: Fifty mg per dose would only total 100 mg per day, which is below the prescribed dose.
Choice D reason: One hundred mg per dose would total 200 mg daily, which exceeds the prescribed 150 mg/day.
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Correct Answer is D
Explanation
Choice A reason: Zero tablets would result in the patient not receiving the required medication.
Choice B reason: Three tablets equal 15 mg, which is above the prescribed dose and could cause adverse effects.
Choice C reason: Half a tablet equals 2.5 mg, which is insufficient to meet the 10 mg prescribed dose.
Choice D reason: Two tablets equal the prescribed 10 mg, which is correct.
Correct Answer is C
Explanation
Choice A reason: Pseudoparkinsonism involves tremors, shuffling gait, rigidity, and bradykinesia, but it does not cause high fever, blood pressure instability, or diaphoresis.
Choice B reason: Tardive dyskinesia involves involuntary movements such as lip smacking, tongue protrusion, or grimacing, and it develops gradually after long-term medication use. It does not cause acute systemic symptoms.
Choice C reason: Neuroleptic malignant syndrome (NMS) is a rare but life-threatening reaction to antipsychotics. It presents with hyperpyrexia, autonomic instability (blood pressure changes, diaphoresis), muscle rigidity, and altered mental status. This fits the scenario.
Choice D reason: Acute dystonia is characterized by sudden, severe muscle contractions (often of the neck, eyes, or jaw) but does not include fever or autonomic instability.
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