The directions for reconstitution of mezlocillin IV injection read: "For IV use, reconstitute with 30 mL sterile water for injection. Each 30 mL of reconstituted solution will contain 3 grams of mezlocillin." The patient/client is to receive 1.5 g of mezlocillin IV every 6 hours. How many milliliters would the nurse administer?
15 mL/dose
3 mL/dose
30 mL/dose
1.5 mL/dose
The Correct Answer is A
The reconstituted concentration is 3 grams in 30 mL.
- Convert to grams per mL: 3 g ÷ 30 mL = 0.1 g/mL.
- Ordered dose is 1.5 g.
- Volume needed = 1.5 g ÷ 0.1 g/mL = 15 mL.
- Therefore, the nurse should administer 15 mL per dose.
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Related Questions
Correct Answer is A
Explanation
Step 1: Convert the available concentration to mg/mL
- The pharmacy has 0.5 g in 1.5 mL.
- 0.5 g = 500 mg.
- So the concentration is 500 mg per 1.5 mL, which equals about 333 mg per 1 mL.
Step 2: Calculate the volume needed for the ordered dose
- Ordered dose = 750 mg.
- Volume = 750 ÷ 333 ≈ 2.25 mL.
Step 3: Match to the closest option
- 2.25 mL rounds to 2.3 mL.
Correct Answer: 2.3 mL/dose
Correct Answer is B
Explanation
Step 1: Interpret the concentration
- The label says: after reconstitution, each 1 mL contains 250 mg of ampicillin sodium.
Step 2: Calculate the ordered dose
- Ordered dose = 500 mg.
- Concentration = 250 mg per 1 mL.
Volume needed = 500 ÷ 250 = 2 mL.
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