Examples · Oral dose — tablets
Worked example
Oral dose — tablets — practice problem 4
The prescriber orders 1000 mg of warfarin PO. The pharmacy stocks warfarin in 500 mg tablets.
Ordered dose1000 mg
On hand500 mg per tablet
How many tablets should the nurse give?
Answer: 2 tablets
Step-by-step solution
1. Identify what you have and what you want
Have: 500 mg per tablet · Want: 1000 mg
2. Set up dimensional analysis so mg cancels
1000 mg × ( 1 tablet ÷ 500 mg )
3. Cancel mg and solve
= ( 1000 × 1 ) ÷ 500 tablet
= 2 tablets
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