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 C

Explanation

a) Encouraging increased fluid intake is not always appropriate for a patient on a thiazide diuretic, as these drugs promote fluid loss. Excess fluid intake may not be beneficial unless there are signs of dehydration.

b) Increasing activity and exercise can be beneficial for overall health, but the priority is ensuring safety due to the risk of orthostatic hypotension and falls.

c) Initiating a fall risk protocol is crucial because thiazide diuretics can cause hypotension, dizziness, and electrolyte imbalances, all of which increase the risk of falls, particularly in older adults.

d) Providing a low potassium diet is inappropriate, as thiazide diuretics can lead to hypokalemia (low potassium levels), so monitoring and possibly increasing potassium intake may be necessary.

A. To ensure a drug is tested for harmful effects. B. To ensure a drug has accurate labeling. C. To ensure a drug is free from adverse reactions. D. To ensure a drug is affordable. E. To ensure a drug is effective.

Correct Answer is ["A","B","E"]

Explanation

a) The FDA is responsible for overseeing the testing of drugs for harmful effects, including preclinical trials and clinical trials, to ensure that drugs do not cause unsafe side effects.

b) The FDA ensures that drugs have accurate labeling, including correct dosage, potential side effects, contraindications, and proper use.

c) The FDA does not guarantee that a drug will be free from adverse reactions. While they regulate and monitor drugs, adverse reactions can still occur after approval, and it is the responsibility of healthcare professionals and the manufacturer to monitor for these post-marketing.

d) The FDA does not ensure drug affordability; the pricing of drugs is influenced by many factors, including market forces, healthcare policies, and manufacturer decisions.

e) The FDA ensures that drugs are effective by overseeing clinical trials to demonstrate that the drug has the intended therapeutic effects for its indicated use.

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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

Naxlex Comprehensive Predictor Exams

The nurse is caring for an 80-year-old patient who has just begun taking a thiazide diuretic to treat hypertension. What is an important aspect of care for this patient?

Correct Answer is C

Explanation

Which are responsibilities of the FDA? (Select all that apply.)

Correct Answer is ["A","B","E"]

Explanation

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