A nurse is administering a medication with a half-life of 6 hours. If the initial dose is 800 mg, how much of the medication will remain in the patient's system after 18 hours?

300 mg

400 mg

200 mg

100 mg

Answer and Explanation

The Correct Answer is D

A. 300mg is incorrect.
B. 400mg is incorrect
C. 200mg is incorrect
D. The half-life of a drug is the time it takes for the plasma concentration of a drug to decrease by 50%. If the half-life is 6 hours, the amount of drug in the body will halve every 6 hours.

Initial dose: 800 mg
After 6 hours (1st half-life): 800 mg ÷ 2 = 400 mg
After 12 hours (2nd half-life): 400 mg ÷ 2 = 200 mg
After 18 hours (3rd half-life): 200 mg ÷ 2 = 100 mg

After 18 hours (three half-lives), 100 mg of the medication will remain in the patient's system.

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Correct Answer is C

Explanation

A. Montelukast: This leukotriene receptor antagonist is used for long-term asthma control and prevention of exercise-induced bronchospasm. It is not effective for treating acute asthma attacks due to its delayed onset of action.
B. Salmeterol: This is a long-acting beta-2 agonist (LABA) used for maintenance therapy in asthma. It has a slower onset and should never be used for rapid symptom relief during an acute attack, as doing so can delay appropriate treatment.
C. Albuterol: Albuterol is a short-acting beta-2 agonist (SABA) that provides rapid bronchodilation and is the first-line rescue medication for aborting an acute asthma attack. It works within minutes to relieve bronchospasm and improve airflow.
D. Beclomethasone: This inhaled corticosteroid is used for long-term asthma management by reducing airway inflammation. It is not effective in acute situations because it does not provide immediate bronchodilation.

Correct Answer is ["2"]

Explanation

Desired dose = 160 mg

The medication label for Bevyxxa (betrixaban) Capsules states: 80 mg per capsule.

Determine the number of capsules needed:

Number of capsules = Desired dose / Dose per capsule

= 160 mg / 80 mg/capsule

= 2 capsules

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A nurse is administering a medication with a half-life of 6 hours. If the initial dose is 800 mg, how much of the medication will remain in the patient's system after 18 hours?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is teaching a client who has a new diagnosis of asthma. Which of the following medications should the nurse instruct the client to use to abort an acute asthma attack?

Correct Answer is C

Explanation

Order: Betrixaban 160 mg PO STAT Available: Refer to the med label below How many capsules will you administer? (Insert the numerical value only)

Correct Answer is ["2"]

Explanation

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