The nurse gives 800 mg of a drug that has a half-life of 8 hours. How much drug will be left in the body in 24 hours if no additional drug is given?

None

50 mg

100 mg

200 mg

Answer and Explanation

The Correct Answer is C

A. The statement that no drug remains is incorrect. A drug with a half-life of 8 hours will not be completely eliminated in 24 hours, as it follows a predictable pattern of reduction.

B. A reduction to 50 mg would require additional half-life intervals beyond 24 hours. The drug concentration decreases by half every 8 hours, meaning it would take more than 24 hours to reach this level.

C. The correct calculation follows the half-life principle:

- At 8 hours: 800 mg → 400 mg

- At 16 hours: 400 mg → 200 mg

- At 24 hours: 200 mg → 100 mg

Therefore, 100 mg of the drug remains after 24 hours.

D. While 200 mg is a step in the process, it represents the amount remaining after only 16 hours, not the full 24-hour period.

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Correct Answer is D

Explanation

a) While knowing if the patient takes generic medications is useful, it is not the priority. Generic and brand-name drugs generally have the same active ingredients and effects.

b) Orphan drugs are used to treat rare diseases, but this is not a primary concern for most patients and does not directly impact medication safety in routine assessments.

c) Asking about medication safety during pregnancy is important if the patient is pregnant or could become pregnant, but it is not the primary concern for all patients.

d) Over-the-counter (OTC) medications can interact with prescribed medications, potentially leading to adverse effects or reduced efficacy. It is crucial to assess OTC use to ensure there are no dangerous drug interactions.

A. Safe administration of medications B. Informed consent for drug administration C. Adequate information is given D. Cost-effective use of medication

Correct Answer is A

Explanation

a) The six rights of medication administration—right patient, right medication, right dose, right route, right time, and right documentation—help ensure patient safety by reducing medication errors. This is a fundamental nursing practice to prevent adverse drug reactions, overdoses, or omissions.

b) Informed consent is important but is not directly related to the six rights of medication administration. It is typically obtained before administering high-risk medications or treatments.

c) While proper medication administration includes patient education, the six rights primarily focus on safety rather than the adequacy of information given.

d) The six rights do not focus on cost-effectiveness but rather on the accurate and safe administration of drugs.

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The nurse gives 800 mg of a drug that has a half-life of 8 hours. How much drug will be left in the body in 24 hours if no additional drug is given?

Nursing Test Bank

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