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Drug Dosage Calculation Formulas
RatioProportion Method
Step 1
CONVERT
:
All units to the same system, and all units to the same
size.
Step 2
THINK
:
Estimate the reasonable amount.
Step 3
CALCULATE
:
Dosage on hand
= Dosage Desired
Amount on Hand
X Amount Desired
Example:
Order:
Lopid 0.6grams po twice daily
Available:
Lopid 300mg/tablet
How many tablets will be administered?
Step 1:
CONVERT
1 gram
= 0.6grams
(Crossmultiply)
1000mg
Xmg
1X = 0.6 multiply by 1000
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Unformatted text preview: 1X = 600 (divide by the 1 to isolate the X) 1 1 X = 600mg Step 2: THINK : You want to give 600mg and each supplied tablet (what is available) is 300 mg. Therefore you will need to give 2 tablets) “BUT LET’S MAKE SURE” Step 3: CALCULATE : Ratioporportion: 300mg = 600mg (Dosage) 1tablet X tablet (Amount) 300X = 600 X 1 (cross multiply) 300X = 600 (now divide by 300 to isolate the X) 300 300 X = 2 tablets...
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This note was uploaded on 01/13/2011 for the course NURS 130 taught by Professor Zozuk during the Spring '08 term at Grossmont.
 Spring '08
 Zozuk

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