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
... [Show More] 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: Rationale:
• 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: Rationale:
• 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: Rationale:
• 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: Rationale:
• 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: Rationale:
• 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.
Computation: 1 mg = 1,000 mcg l
6. 6. Question
A health care provider orders ceftazidime (Tazidime) 0.3 g IM tid; Reconstitution instructions: For IM solution add 1.5 mL of diluent. Shake to dissolve. Provides an approximate volume of 1.8 mL (280 mg/mL). How many mL will you give? Fill in the blanks. Record your answer using one decimal place. [Show Less]