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Applied Math in nursing
Nizar Muhammad(PharmD, RPh)
CALCULATING DRUG DOSES
Injections
nizarmuhammad432@gmail.com 1
Unit - 5
7/24/2020
Calculating for administration by injection
• The WIG equation is an essential tool for calculating
the volume of a drug to be injected.
7/24/2020 nizarmuhammad432@gmail.com 2
The equation
There are several versions of the equation that can be
used, but one of the most commonly applied ones is
known as the ‘WIG’ equation.
• ‘WIG’ stands for ‘Want, In, Got’.
• What you ‘Want’ is the amount of drug prescribed.
• What it is ‘In’ is the volume that the drug is contained
in.
• What you have ‘Got’ is the strength of the solution.
• The WIG equation is written as:
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