Examples · Oral dose - liquid
Worked example
Oral dose - liquid - practice problem 3
The prescriber orders 400 mg of ibuprofen oral suspension. The bottle is labeled 200 mg per 10 mL.
Ordered dose400 mg
Concentration200 mg per 10 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: 200 mg per 10 mL · Want: 400 mg
2. Set up dimensional analysis so mg cancels
400 mg × ( 10 mL ÷ 200 mg )
3. Cancel mg and solve
= ( 400 × 10 ) ÷ 200 mL
= 20 mL
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