The healthcare provider prescribes penicillin G benzathine 1,800,000 units intramuscular (IM) for a client with a bacterial infection. The prefilled syringe is labeled, "Penicillin G benzathine 1,200,000 units/2 mL." How many mL should the nurse administer to this client? (Enter numerical value only, rounded to the nearest whole number.)
The Correct Answer is ["3"]
Concentration of penicillin G benzathine: 1,200,000 units/2 mL (given on the syringe label)
Prescribed dose: 1,800,000 units
We need to find the volume (in mL) that delivers the prescribed dose (1,800,000 units) considering the available concentration.
Dosage calculation:
To administer the prescribed dose, we need to find the volume that contains at least 1,800,000 units.
Since the available concentration is 1,200,000 units/2 mL, one prefilled syringe provides 1,200,000 units.
We can calculate the number of syringes needed to deliver the prescribed dose:
Number of syringes = Prescribed dose (units) / Concentration per syringe (units)
Number of syringes = 1,800,000 units / 1,200,000 units/syringe
Number of syringes = 1.5 (round up to 2 since a partial dose wouldn't be sufficient)
2 mL per syringe x 2 syringes = 4 mL
However, the prefilled syringes likely come in whole-number doses. Checking the available options:
A single prefilled syringe provides 1,200,000 units (which is not enough).
Two prefilled syringes would provide a total of 2,400,000 units (more than enough).
Therefore, to ensure at least the prescribed dose is administered, the nurse should administer 3 mL.
This is achieved by using one and a half (rounded up to two) prefilled syringes.
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Related Questions
Correct Answer is ["0.8"]
Explanation
Here's how to calculate the volume (mL) of epoetin alfa the nurse should administer:
1. We know the following:
Prescribed dose: 8,200 units epoetin alfa (given)
Vial concentration: 10,000 units/mL (given from the label)
2. We need to find the volume (mL) to administer for the prescribed dose (8,200 units) considering the concentration (10,000 units/mL).
Volume to administer (mL) = Dose (units) / Concentration (units/mL)
Volume to administer (mL) = 8,200 units / 10,000 units/mL
Volume to administer (mL) = 0.82 mL (round to nearest tenth)
Therefore, the nurse should administer 0.8 mL of epoetin alfa subcutaneously.
Correct Answer is ["7.5"]
Explanation
Here's how to calculate the concentration (mg/mL) of the reconstituted ceftazidime medication
Medication: 750 mg ceftazidime
Diluent: 100 mL sterile water (for reconstitution)
We need to find the concentration (mg/mL) after reconstituting the medication with diluent.
Calculation:
Concentration (mg/mL) = Total medication (mg) / Volume of diluent (mL)
Concentration (mg/mL) = 750 mg / 100 mL
Concentration (mg/mL) = 7.5 mg/mL (round to nearest tenth)
Therefore, the reconstituted medication will have a concentration of 7.5 mg/mL.
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