Dosage calculations, until they stop being scary
Problems are generated fresh every time, so there is nothing to memorise and no way to run out. Write the units at every step. That single habit prevents most of the errors this section is designed to catch.
Liquid dosage
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An order reads morphine 500 mg PO. The bottle is labelled 250 mg per 5 mL. How many millilitres will the nurse give?
mL
Round to the nearest tenth.
Formula
Volume = (Desired ÷ Available) × Quantity
Where marks get lost
Forgetting that the available strength is per a stated volume, not per millilitre.