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Dosage and Calculations Math Practice Fundamentals of Nursing

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Sandra Watson
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Dosage and Calculations Math Practice Fundamentals of Nursing

Common Conversions:
1 Liter = 1000 Milliliters 1L = 1000 mL
1 Gram = 1000 Milligrams 1g = 1000 mg
1 Milligram = 1000 Micrograms 1 mg = 1000mcg
1 Kilogram = 2.2 Pounds 1 kg = 2.2 lbs

Methods of Calculation

Any of the following three methods can be used to perform drug calculations. Pl review all three methods and select the one that works for you. It is important to practice the method that you prefer to become proficient in calculating drug dosages. Remember: Before doing the calculation, convert units of measurement to one system.

I. Basic Formula: Frequently used to calculate drug dosages.

D (Desired dose) H (Dose on hand)
V (Vehicle-tablet or liquid)
D x V = Amount to Give H
D = dose ordered or desired dose
H = dose on container label or dose on hand
V = form and amount in which drug comes (tablet, capsule, liquid) Example: Order-Dilantin 50 mg po
TID
Drug available-Dilantin 125 mg/5ml
D=50 mg H=125 mg V=5 ml

 

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Dosage and Calculations Math Practice Fundamentals of Nursing

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