A nurse is preparing to administer ampicillin 500 mg IM every 6 hr. The available ampicillin is in a 500 mg vial.
The package insert instructs to add 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"]
Step 1: The available ampicillin is in a 500 mg vial. The package insert instructs to add 1.8 mL of sterile water to yield ampicillin 250 mg/mL.
Step 2: We need to administer 500 mg of ampicillin. Step 3: The concentration of the solution is 250 mg/mL.
Step 4: To find out how many mL should the nurse administer per dose, we divide the required dose by the concentration.
Step 5: So, 500 mg ÷ 250 mg/mL = 2 mL. The nurse should administer 2 mL per dose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["48"]
Explanation
Step 1: Convert the patient’s weight from lbs to kg. 1 kg = 2.2 lbs. So, 210 lbs ÷ 2.2 = 95.45 kg.
Step 2: Calculate the total dosage of gentamicin. The doctor ordered 5 mg/kg. So, 5 mg/kg ×
95.45 kg = 477.27 mg.
Step 3: Calculate the volume to administer. The available gentamicin is 10 mg/mL. So, 477.27 mg ÷ 10 mg/mL = 47.73 mL. The nurse should administer 48 mL of gentamicin.
Correct Answer is ["0.71"]
Explanation
Step 1: Calculate the concentration of the reconstituted medication. We are told that each vial is reconstituted with 2.1mL of sterile water to yield 350mg/mL of ceftriaxone. So, the concentration of the reconstituted medication is 350mg/mL.
Step 2: Calculate the volume of the reconstituted medication to administer. We are told to administer 250mg of ceftriaxone. So, the volume to administer is 250mg ÷ 350mg/mL.
Step 3: Round the answer to the nearest hundredth. The calculated volume to administer is 0.714285714 mL. When rounded to the nearest hundredth, the volume to administer is 0.71 mL.
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