The nurse is preparing to administer a prescription for cefazolin 600 mg IM every six hours. The available vial is labeled, *Cefazolin 1 gram," and the instructions for reconstitution state, "For IM use add 2 mL sterile water for injection. Total volume reconstitution equals 2.5 mL." When reconstituted, how many milligrams are in each mL of solution? (Enter numeric value only)
The Correct Answer is ["400"]
Given:
Vial strength: Cefazolin 1 gram (1000 mg)
Volume of diluent: 2 mL sterile water
Total volume after reconstitution: 2.5 mL
Step 1: Calculate the concentration of Cefazolin in the reconstituted solution:
Concentration (mg/mL) = Total amount of Cefazolin (mg) / Total volume of solution (mL)
Concentration (mg/mL) = 1000 mg / 2.5 mL
Concentration (mg/mL) = 400 mg/mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["4"]
Explanation
Ordered dose of tetracycline: 500 mg every 12 hours
Available tetracycline capsules: 250 mg/capsule
Step 1: Determine the total daily dose of tetracycline:
Since the medication is given every 12 hours, there are 2 administrations per day.
Total daily dose (mg) = Dose per administration (mg) x Number of administrations per day
Total daily dose (mg) = 500 mg/dose x 2 doses/day
Total daily dose (mg) = 1000 mg/day
Step 2: Calculate the number of capsules required per day:
Number of capsules/day = Total daily dose (mg) / Strength of each capsule (mg/capsule)
Number of capsules/day = 1000 mg/day / 250 mg/capsule
Number of capsules/day = 4 capsules/day
Correct Answer is ["30"]
Explanation
Given:
Ordered dose of lamivudine: 150 mg twice daily
Concentration of lamivudine solution: 10 mg/mL
Step 1: Calculate the total daily dose of lamivudine:
Total daily dose (mg) = Dose per administration (mg) x Number of administrations per day
Total daily dose (mg) = 150 mg/dose x 2 doses/day
Total daily dose (mg) = 300 mg/day
Step 2: Calculate the volume to be administered per dose:
Volume (mL) = Dose per administration (mg) / Concentration (mg/mL)
Volume (mL) = 150 mg / 10 mg/mL
Volume (mL) = 15 mL/dose
Step 3: Calculate the total volume to be administered in 24 hours:
Total volume (mL) = Volume per dose (mL) x Number of doses per day
Total volume (mL) = 15 mL/dose x 2 doses/day
Total volume (mL) = 30 mL/day
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