Roman Numerals in Pharmacy and Dosage Calculations

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15 Terms

1
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I

One

2
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V

Five

3
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X

Ten

4
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L

Fifty

5
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C

One Hundred

6
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D

Five Hundred

7
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M

One Thousand

8
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SS

1/2-half

9
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If one or more letters are placed after another letter of GREATER value what do you do?

Ex: X V I = ?

Add them together

10+5+1=16

10
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If a letter of lower value is place before another letter of greater value?

Ex: I X= ?

The lower value is subtracted from the higher value

10 - 1 = 9

11
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First look for and do all?

Then?

Ex: C L X I V

Subtraction

Add together remaining values

C L X I V = CLX + (I V) = CLX + 4 =

100 + 50 + 10 + 4 = 164

12
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A letter can only repeat?

Three times.

Ex: 9 is IX not VIIII

13
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V L and D are never?

Subtracted or repeated

14
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Clarks Rule

Weight in Lbs never Kg

Adult dose x (Weight / 150) = Child Dose

15
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Youngs Rule

Uses Age

Adult Dose x (age / (age + 12)) = Child Dose