Ceftazidime 750 mg IV every 12 hours is prescribed for a client with an infection. The directions on the label of the 750 mg vial instruct the nurse to reconstitute with 100 mL sterile water. The reconstituted medication provides how many mg/mL? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
The Correct Answer is ["7.5"]
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["0.9"]
Explanation
Here's how to calculate the total volume the nurse should administer for the combined medication:
1. Calculate the volume of hydromorphone:
Dose: 4 mg
Concentration: 10 mg/mL (from ampule label)
Volume (mL) for hydromorphone = Dose (mg) / Concentration (mg/mL)
Volume (mL) for hydromorphone = 4 mg / 10 mg/mL
Volume (mL) for hydromorphone = 0.4 mL
2. Calculate the volume of hydroxyzine:
Dose: 25 mg
Concentration: 50 mg/mL (from vial label)
Volume (mL) for hydroxyzine = Dose (mg) / Concentration (mg/mL)
Volume (mL) for hydroxyzine = 25 mg / 50 mg/mL
Volume (mL) for hydroxyzine = 0.5 mL
3. Add the volumes for each medication to find the total volume:
Total volume = Volume (mL) for hydromorphone + Volume (mL) for hydroxyzine
Total volume = 0.4 mL + 0.5 mL
Total volume = 0.9 mL (round to nearest tenth as requested)
Therefore, the nurse should administer a total of 0.9 mL.
Correct Answer is ["3"]
Explanation
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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