A nurse is preparing to administer ampicillin 500 mg IM every 6 hr. Available is ampicillin 500 mg vial. The package insert instructs adding 1.8 mL of sterile water to yield ampicillin 250 mg/mL. How many mL should the nurse administer per dose?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["2"]
To calculate the amount of ampicillin the nurse should administer per dose in milliliters (mL) for a 500 mg IM dose, we can use the following steps:
Given:
Ampicillin dose: 500 mg
Available concentration after reconstitution: 250 mg/mL
Volume of sterile water to be added: 1.8 mL
Step 1: Calculate the amount of ampicillin to be administered per dose in mL
First, we need to reconstitute the ampicillin vial to yield the desired concentration of 250 mg/mL.
The concentration after reconstitution is 250 mg/mL, and the total dose required is 500 mg. Therefore, the nurse needs to administer:
Volume = Ampicillin dose / Concentration
Volume = 500 mg / 250 mg/mL
Volume = 2 mL
Rounding to the nearest whole number:
Volume = 2 mL
Therefore, the nurse should administer 2 mL of the reconstituted ampicillin solution per dose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: This is incorrect because spironolactone does not affect the heart rate. Checking the heart rate before each dose is not necessary.
Choice B reason: This is incorrect because spironolactone does not interact with acetaminophen. Taking acetaminophen with spironolactone will not cause bleeding.
Choice C reason: This is incorrect because spironolactone does not cause dry cough or increase blood sugar. These are not signs of adverse effects of spironolactone.
Choice D reason: This is correct because spironolactone can cause hyperkalemia, which is a high level of potassium in the blood. Bananas, cantaloupe, and spinach are high-potassium foods that should be avoided by clients taking spironolactone.
Correct Answer is ["1"]
Explanation
To determine the number of tablets the nurse should administer for each dose, we can use the following calculation:
75 mg/day ÷ 2 doses = 37.5 mg/dose
Since 37.5 mg tablets are available, the nurse should administer 1 tablet with each dose.
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