Examples · Reconstitution
Worked example
Reconstitution - practice problem 7
The prescriber orders 3375 mg of piperacillin-tazobactam IV. The vial directs: add 20 mL of diluent to yield 200 mg/mL.
Ordered dose3375 mg
After reconstitution200 mg/mL
Diluent20 mL
How many milliliters should the nurse draw up?
Answer: 16.88 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 20 mL diluent → 200 mg per 1 mL
2. Set up dimensional analysis so mg cancels
3375 mg × ( 1 mL ÷ 200 mg )
3. Cancel mg and solve
= 3375 ÷ 200 mL
= 16.88 mL
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