Examples · Oral dose - liquid
Worked example
Oral dose - liquid - practice problem 9
The prescriber orders 400 mg of ibuprofen oral suspension. The bottle is labeled 100 mg per 5 mL.
Ordered dose400 mg
Concentration100 mg per 5 mL
How many milliliters should the nurse give?
Answer: 20 mL
Step-by-step solution
1. Identify what you have and what you want
Have: 100 mg per 5 mL · Want: 400 mg
2. Set up dimensional analysis so mg cancels
400 mg × ( 5 mL ÷ 100 mg )
3. Cancel mg and solve
= ( 400 × 5 ) ÷ 100 mL
= 20 mL
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