c. Example 1. You have a 10-ml vial of aminophylline labeled "25 mg per ml".
How many milliliters must be injected to administer a dose of 125 mg?
(1) Step 1. If there are 25 mg of drug per 1 ml, then there are 125 mg of
drug per X ml.
(2) Step 2. IF
25 mg THEN 125 mg
1 ml
=
X ml
(3) Step 3. 25 X = 125 1
(4) Step 4. 25 X = 125
(5) Solve for X.
25X = 125
25
25
X
= 5 ml (answer) [125 divided by 25 is 5]
d. Example 2. How many milliliters must be injected from an ampule of
Prochlorperazine labeled "10 mg/2 ml" in order to administer a dose of 7.5 mg?
(1) Step 1. If there are 10 mg of drug per 2 ml, then there are 7.5 mg of drug
per X ml.
(2) Step 2. IF 10 mg
THEN
7.5 mg
2 ml
=
X ml
(3) Step 3. 10 X = 2 7.5
(4) Step 4. 10X = 15
(5) Solve for X.
10X = 15
10
10
X = 1.5 ml (answer) [15 divided by 10 is 1.5]
MD0913
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