A nurse is preparing to administer metoprolol 10 mg IV bolus to a client for heart rate control. Available is metoprolol injection 2.5 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 ["4"]
Determine the desired dose.
The nurse needs to administer 10 mg of metoprolol.
Calculate the available dose per mL.
The available metoprolol is 2.5 mg/mL.
Calculate the volume to be administered.
Volume = Desired dose (mg) / Concentration (mg/mL) = 10 mg / 2.5 mg/mL = 4 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["2.5"]
Explanation
Determine the desired dose.
The doctor orders 250 mg of ampicillin.
Calculate the available dose per mL.
The label says to add 4.5 mL of sterile water to yield 1 g/10 mL. This means that each mL of the reconstituted solution contains 1 g / 10 mL = 0.1 g = 100 mg of ampicillin.
Calculate the volume to be administered.
Volume = Desired dose (mg) / Concentration (mg/mL) = 250 mg / 100 mg/mL = 2.5 mL
Correct Answer is ["3.2"]
Explanation
Convert the infant's weight to kg.
The infant weighs 12 lb.
1 lb is approximately equal to 0.45 kg.
Infant's weight in kg = 12 lb x 0.45 kg/lb = 5.4 kg
Calculate the dose per administration.
The prescribed dose is 15 mg/kg/dose.
Dose per administration = 15 mg/kg/dose x 5.4 kg = 81 mg/dose
Calculate the volume to be administered.
The available concentration is 125 mg/5 mL.
Volume = Dose per administration (mg) / Concentration (mg/mL) = 81 mg / (125 mg/5 mL) = 81 mg x (5 mL/125 mg) = 3.24 mL
Round the volume to the nearest tenth.
Volume = 3.2 mL
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