The prescriber orders 2250 mg of piperacillin-tazobactam IV. The vial directs: add 20 mL of diluent to yield 200 mg/mL.
Ordered dose2250 mg
After reconstitution200 mg/mL
Diluent20 mL
How many milliliters should the nurse draw up?
Answer: 11.25 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
2250 mg × ( 1 mL ÷ 200 mg )
3. Cancel mg and solve
= 2250 ÷ 200 mL
= 11.25 mL
The prescriber orders 80 mg of methylprednisolone IV. The vial directs: add 1 mL of diluent to yield 40 mg/mL.
Ordered dose80 mg
After reconstitution40 mg/mL
Diluent1 mL
How many milliliters should the nurse draw up?
Answer: 2 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 1 mL diluent → 40 mg per 1 mL
2. Set up dimensional analysis so mg cancels
80 mg × ( 1 mL ÷ 40 mg )
3. Cancel mg and solve
= 80 ÷ 40 mL
= 2 mL
The prescriber orders 2000 mg of ceftriaxone IV. The vial directs: add 10 mL of diluent to yield 100 mg/mL.
Ordered dose2000 mg
After reconstitution100 mg/mL
Diluent10 mL
How many milliliters should the nurse draw up?
Answer: 20 mL
Step-by-step solution
1. Read the concentration after reconstitution
Add 10 mL diluent → 100 mg per 1 mL
2. Set up dimensional analysis so mg cancels
2000 mg × ( 1 mL ÷ 100 mg )
3. Cancel mg and solve
= 2000 ÷ 100 mL
= 20 mL