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

1-10

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