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.

Answer and Explanation

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 C

Explanation

Choice A reason: Pseudoparkinsonism causes symptoms such as tremors, rigidity, bradykinesia, and shuffling gait. It is not associated with fever, blood pressure changes, or diaphoresis.

Choice B reason: Tardive dyskinesia develops gradually after prolonged antipsychotic use and presents with involuntary movements like lip smacking, tongue protrusion, or grimacing. It does not cause acute systemic symptoms such as hyperpyrexia or autonomic instability.

Choice C reason: Neuroleptic malignant syndrome (NMS) is a life-threatening emergency associated with antipsychotics. It manifests with hyperpyrexia, autonomic instability (blood pressure changes, diaphoresis), severe muscle rigidity, and altered mental status. The client’s presentation matches NMS.

Choice D reason: Acute dystonia involves sudden muscle contractions affecting the face, neck, or back (e.g., torticollis, oculogyric crisis). It does not present with systemic symptoms like fever or blood pressure fluctuations.

A. 3 tablets B. 2 tablets C. 1 tablet D. 4 tablets

Correct Answer is B

Explanation

Choice A reason: Three tablets would equal 750 mg, which exceeds the prescribed 500 mg dose and could lead to overdose.

Choice B reason: Two tablets of 250 mg each equal the prescribed 500 mg dose, making this the correct answer.

Choice C reason: One tablet would equal 250 mg, which is only half the prescribed daily dose and would be ineffective.

Choice D reason: Four tablets would equal 1,000 mg, which is double the prescribed dose and could be toxic.

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A patient is prescribed 150 mg/day of Lithium, divided into two equal doses. How much Lithium should be given per dose?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is C

Explanation

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Correct Answer is B

Explanation

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