Parenteral Medications Dosage Calculations (Part 3: 50 Items)-UPDATED

Parenteral Medications Dosage Calculations
(Part 3: 50 Items)

1. 1. Question
A health care provider prescribes kanamycin (Kantrex) 7.5 mg/kg IM q
12 hr; Available: kanamycin 0.35 Gm/mL. How many mL will you
administer for each dose to a 157 lb patient? Fill in the blanks.
Record your answer using one decimal place.


o Answer: (1.5) mL.
Incorrect
Correct answer:
 1.5 mL.


Formula: Rational
e:
 1 kg is equal to 2.2 lbs.
 Convert lbs to kg first by dividing 157 lbs by 2.2 lbs to get 71 kg.
 Multiply 7.5 mg/kg to 71 kg to get 532.5 mg.
 1 g is equal to 1,000 mg.
 Convert grams to mg by multiplying 0.35 g to 1,000 mg to get
350 mg.
 Use the standard formula above.
 Divide 532.5 mg (desired dose) with 350 mg (drug on hand), then
multiply by 1 ml (vehicle) to get 1.52 ml.
 Finally, round it off to one decimal place to get 1.5 ml.
Computation: 157 lbs = 71.36 kg or 71 kg 7.5 mg/kg x 71 kg = 532.5


mg
2. 2. Question
A health care provider orders Heparin 7,855 units subq bid; Available:
Heparin 10,000 units per ml. How many mL will you administer? Fill in
the blanks. Record your answer using two decimal places.


 Answer: (0.79) mL.
Incorrect

, Correct answer:
 0.79 mL.


Formula: Rational
e:
 Use the standard formula above.
 Divide 7,855 units (desired dose) with 10,000 units (drug on
hand), then multiply with 1 ml (vehicle) to get 0.7855 ml.
 Round it of to two decimal places to get 0.79 ml.



Computation:
3. 3. Question
A health care provider prescribes meperidine (Demerol) 50 mg IVP q 6
hr prn pain. Available on hand is meperidine 75 mg/1.3 mL. How many
mL will you administer? Fill in the blanks and record your answer
using two decimal places.


 Answer: (0.87) mL.
Incorrect
Correct answer:
 0.87 mL.


Formula: Rational
e:
 Use the standard formula above.
 Divide 50 mg (desired dose) by 75 mg (drug on hand) to get 0.67
mg.
 Multiply 0.67 mg with 1.3 ml (vehicle) to get 0.871 ml.
 Finally, round it off to two decimal places to get 0.87 ml.



Computation:
4. 4. Question
A health care provider orders Streptomycin 1.75 mg/ lb IM q 12 hr;
Available: Streptomycin 0.35 g / 2.3 mL. How many mL will you
administer a day to a 59 Kg patient? Fill in the blanks.


 Answer: (3) mL.

, Incorrect
Correct answer:
 3 mL.


Formula: Rational
e:
 Convert kg to lbs first by multiplying 59 kgs to 2.2 lbs to get 130
lbs.
 Multiply 1.75 mg/lbs to 130 lbs to get 227.5 mg.
 Use the standard formula above.
 Divide 227.5 mg (desired dose) with 0.35 g (drug on hand) to get
650 mg.
 Divide 650 mg with 1000 mg to get 0.65 g.
 Multiply 0.65 g to 2.3 ml (vehicle) to get 1.5 ml.
 Multiply 1.5 ml to 2 doses per day to get 3 ml.
Computation: 59 kg = 130 lbs 1.75 mg/lbs x 130 lbs = 227.5


mg 1.5 ml x
2 = 3 ml
5. 5. Question
A health care provider prescribes bumetanide (Bumex) 0.8 mg IV bolus
bid; Reconstitution instructions: Constitute to 1000 micrograms/3.1 mL
with 4.8mL of 5% Dextrose Water for Injection. How many mL will
you administer? Fill in the blanks. Record your answer using
one decimal place.


 Answer: (2.5) mL.
Incorrect
Correct answer:
 2.5 mL.


Formula: Rational
e:
 1 mg is equal to 1,000 mcg.
 Convert first by dividing 0.8 mg with 1000 mcg to get 0.0008
mcg.
 Multiply 0.0008 mcg (desired dose) to 1,000 mcg (drug on hand)
to get 0.8 mcg.
 Then, multiply 0.8 mcg to 3.1 ml (vehicle) to get 2.48 ml.
 Finally, round it off to one decimal place to get 2.5 ml.