drug calculation

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Many nurses are weak with put ~s into calculations of all sorts. This division will help to review the major concepts related to drug calculations, alleviate walk you through a few exercises, and furnish supplies a few exercises you can achieve on your own to check your skills. There are multitude reference books available to review basic math skills, granting that you find that you have arduousness with even the basic conversion exercises.

Common Conversions:
1 Liter = 1000 Milliliters
1 Gram = 1000 Milligrams
1 Milligram = 1000 Micrograms
1 Kilogram = 2.2 pounds

Methods of Calculation
Any of the following three methods can be used to perform drug calculations. Please pass in ~ all three methods and select the united that works for you. It is material to practice the method that you count more desirable to become proficient in calculating unsalable article dosages.
Remember: Before doing the anticipation, convert units of measurement to united system.
I. Basic Formula: Frequently used to adjust drug dosages.
D (Desired dose)
H (Dose in c~tinuance hand)
V (Vehicle-tablet or liquor)
D
H
x V = Amount to Give
D = prescribed portion ordered or desired dose
H = drench on container label or dose in c~tinuance hand
V = form and amount in what one. drug comes (tablet, capsule, liquid)
Example:
Order-Dilantin 50 mg p.o. TID
Drug to be availed of-Dilantin 125 mg/5ml

D=50 mg
H=125 mg
V=5 ml

50 
125
x 5 =
250
125
= 2 ml
II. Ratio & Proportion: Oldest method used in calculating dosage.
Known
 
Desired
H
:
V
::
D
:
X
 
 
Means
 
 
Extremes
III. Left indirect are known quantities
IV. Right lateral is desired dose and amount to give
V. Multiply the means and the extremities
HX = DV

VI.
X =
DV
H
VII.
Example:
Order-Keflex 1 gm p.o. BID
Drug serviceable-Keflex 250 mg per capsule

VIII. D=1 gm (comment: need to convert to milligrams)
1 gm = 1000 mg
IX. H=250 mg
X. V=1 percussion cap
250
:
1
::
1000
:
X
XI. 250X = 1000
X =
1000
250
XII. X = 4 capsules
XIII. Fractional Equation
H
V
=
D
X
XIV. Cross grow in number and solve for X.
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