Examples · Oral dose — liquid
Worked example
Oral dose — liquid — practice problem 8
The prescriber orders 400 mg of ranitidine oral suspension. The bottle is labeled 200 mg per 1 mL.
Ordered dose400 mg
Concentration200 mg per 1 mL
How many milliliters should the nurse give?
Answer: 2 mL
Step-by-step solution
1. Identify what you have and what you want
Have: 200 mg per 1 mL · Want: 400 mg
2. Set up dimensional analysis so mg cancels
400 mg × ( 1 mL ÷ 200 mg )
3. Cancel mg and solve
= ( 400 × 1 ) ÷ 200 mL
= 2 mL
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