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).


\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


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

Answer: 2 tablets

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