Examples · Oral dose - liquid
Worked example
Oral dose - liquid - practice problem 8
The prescriber orders 50 mg of diphenhydramine oral solution. The bottle is labeled 12.5 mg per 5 mL.
Ordered dose50 mg
Concentration12.5 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: 12.5 mg per 5 mL · Want: 50 mg
2. Set up dimensional analysis so mg cancels
50 mg × ( 5 mL ÷ 12.5 mg )
3. Cancel mg and solve
= ( 50 × 5 ) ÷ 12.5 mL
= 20 mL
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