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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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Three tablets equal 150 mg, which is the total daily dose, not the per-dose amount.
Choice B reason: 300 mg divided into two doses equals 150 mg per dose. Each tablet is 50 mg, so 150 ÷ 50 = 3 tablets per dose. Wait correction → That equals 3 tablets per dose, not 5. The correct option should be A).
The correct answer is: A).
Choice A reason: Each dose must equal 150 mg. With 50 mg tablets, that equals 3 tablets per dose. This is the accurate calculation.
Choice B reason: Five tablets would equal 250 mg per dose, which is too high and exceeds the prescribed amount.
Choice C reason: Six tablets equal 300 mg per dose, doubling the total daily prescription.
Choice D reason: Four tablets equal 200 mg per dose, which is higher than prescribed.
Correct Answer is B
Explanation
Choice A reason: Risperidone more commonly causes orthostatic hypotension rather than hypertension, so this is misleading information.
Choice B reason: Constipation is a frequent adverse effect due to anticholinergic action. Increasing fluid and fiber is an appropriate teaching strategy to manage this side effect.
Choice C reason: Weekly blood tests are not required for risperidone; such monitoring is typically associated with clozapine due to the risk of agranulocytosis.
Choice D reason: Risperidone is more likely to cause weight gain and metabolic syndrome, not weight loss, making this response inaccurate.
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