Remember that the size (total # of mls) of the bottle of medication has no

influence on the Expression of Strength of the medication.

medication is stocked in a 100 ml bottle that contains 250 mg of

the medication per 5 ml.

a. Set up the proportion. *LABEL ALL UNITS*.

250 mg = 125 mg

5 ml

X ml

b. Convert the strength of the medication ordered and the strength of the

medication stocked to the same unit of measurement.

(not applicable here)

c. Cross-multiply.

250X = 725

d. Solve for "X." Label the answer.

X = 2.5 ml

Administer ampicillin 125 mg P.O. to a pediatric patient. On

hand is a 100 ml bottle of ampicillin suspension labeled 0.2 gm

per 4 ml. How many ml will you give?

a. Set up the proportion. *LABEL ALL UNITS*.

0.2 gm = 125 mg

4 ml

X ml

MD0904

2-27

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