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Fractional Equation
Another method of medication dosage calculation is the "fractional equation" method. You can choose which method you prefer to use.
Formula: (H / V) = (D / X)
Order : Morphine Sulfate 8 mg, IV, q 3h prn pain
H: the dosage written on the medication label or in other words, what is "on hand."
V: the "vehicle" or the form in which the medication is prepared (e.g. tablet, capsule, liquid)
D: the medication dose ordered by the physician or nurse practitioner
X: the "unknown" amount to be administered
