# Fractional Equation Method

Fractional Equation Method

• A method similar to ratio and proportion but expressed as fractions.
• Where in:
• D = Desired dose or dose ordered by the primary care provider.
• H = dose on hand or dose on the label of bottle, vial, ampule.
• V = vehicle or the form in which the drug comes (i.e., tablet or liquid).

FRACTIONAL EQUATION METHOD

$\frac{H}{V}= \frac{D}{x}$

Order: Digoxin 0.25 mg
On hand: Digoxin 0.125 mg tablets

Desired (D) = 0.25 mg
On hand (H) = 0.125 mg
Vehicle (V) = 1 tablets

Computation:

$\frac{0.125\ mg}{1\ tablets}= \frac{0.25\ mg}{x}$