Examples · Reconstitution
Worked example
Reconstitution — practice problem 8
The prescriber orders 150 mg of cefazolin IV. The vial directs: add 10 mL of diluent to yield 50 mg/mL.
Ordered dose150 mg
After reconstitution50 mg/mL
Diluent10 mL
How many milliliters should the nurse draw up?
Answer: 3 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 10 mL diluent → 50 mg per 1 mL
2. Set up dimensional analysis so mg cancels
150 mg × ( 1 mL ÷ 50 mg )
3. Cancel mg and solve
= 150 ÷ 50 mL
= 3 mL
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