Examples · Oral dose - liquid
Worked example
Oral dose - liquid - practice problem 5
The prescriber orders 375 mg of cephalexin oral suspension. The bottle is labeled 125 mg per 5 mL.
Ordered dose375 mg
Concentration125 mg per 5 mL
How many milliliters should the nurse give?
Answer: 15 mL
Step-by-step solution
1. Identify what you have and what you want
Have: 125 mg per 5 mL · Want: 375 mg
2. Set up dimensional analysis so mg cancels
375 mg × ( 5 mL ÷ 125 mg )
3. Cancel mg and solve
= ( 375 × 5 ) ÷ 125 mL
= 15 mL
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