Examples · Oral dose - liquid
Worked example
Oral dose - liquid - practice problem 2
The prescriber orders 250 mg of cephalexin oral suspension. The bottle is labeled 125 mg per 5 mL.
Ordered dose250 mg
Concentration125 mg per 5 mL
How many milliliters should the nurse give?
Answer: 10 mL
Step-by-step solution
1. Identify what you have and what you want
Have: 125 mg per 5 mL · Want: 250 mg
2. Set up dimensional analysis so mg cancels
250 mg × ( 5 mL ÷ 125 mg )
3. Cancel mg and solve
= ( 250 × 5 ) ÷ 125 mL
= 10 mL
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