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
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Schedule II drugs are controlled substances with a high potential for abuse. Proper disposal requires a witness, usually another nurse, to verify and cosign the waste to ensure accountability and prevent diversion.
B. Keeping the remaining drug in the patient’s drawer is unsafe and violates controlled substance regulations. Single-use vials should not be stored for later use.
C. While documentation of administered medication is necessary, simply recording the unused amount in the patient’s chart is insufficient. Controlled substances require proper disposal with a witness.
D. Controlled substances cannot be discarded in a general locked collection box without proper witnessing and documentation. The correct procedure is to have another nurse verify and cosign the waste before disposal.
Correct Answer is C
Explanation
A. Capsules generally take longer to dissolve than liquid suspensions and thus do not provide the fastest onset of action.
B. Enteric-coated pills are designed to dissolve in the small intestine rather than the stomach, which can delay the onset of action. They are typically used to protect the drug from stomach acid or to prevent stomach irritation, not for rapid action.
C. Liquid suspensions are absorbed more quickly than solid forms of medication because they do not need to dissolve first, allowing for faster onset of action.
D. Tablets take longer to dissolve than liquid forms and may not provide as rapid an effect as a liquid suspension.
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