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1. A patient is receiving 160 mg of methylprednisolone (Medrol) IM every 12 hours. You have on hand two vials that each contains 125 mg/2 mL. How much will you draw into a syringe? Fill in the blanks. Correct answer: 2.6 mL. Formula: Rationale: • Use the standard formula above. • Multiply 160 mg (desired dose) to 2 ml (vehicle) to get 320 ml. • Divide 320 ml with 125 mg to get 2.56 ml. • Finally, round it off to one decimal place to get 2.6 ml. Computation: 2. You have an order for furosemide (Lasix) 80 mg IV every morning. You have on hand Lasix 20 mg in 2 mL sterile water. How many milliliters should you prepare? Fill in the blanks and record your answer using a whole number. 8 mL. Formula: Rationale: • Use the standard formula above. • Multiply 80 mg (desired dose) to 2 ml (vehicle) to get 160 ml. • Then, divide 160 ml with 20 mg (drug on hand) to get 8 ml. Computation: 3. A pre-op patient is ordered Atropine gr. 1/150 IM. The vial contains Atropine 0.4 mg in 1 ml. How much in ml will you give? Fill in the blanks. Correct answer: 1 mL. Formula: Rationale: • 1/150 gr is equal to 0.4 mg. • Divide 0.4 mg (desired dose) with 0.4 mg (drug on hand), then multiply by 1 ml (vehicle) to get 1 ml. Computation: 1gr = 60 mg 1/150 gr – .4 mg 0.4 mg : 1 ml = 0.4 mg : x ml 4. Lanoxin (digoxin) 125 mcg is ordered IVP every a.m. The vial contains 0.5 mg in 2 ml. How many ml will you give? Fill in the blanks. Record your answer using one decimal place. Correct answer: 0.5 mL. Formula: Rationale: • Use the standard formula above. • Convert mcg to mg by dividing 125 mcg with 1,000 mcg to get 0.125 mg. • Divide 0.125 mg (desired dose) with 0.5 mg (drug on hand) to get 0.25 mg. • Multiply 0.25 mg to 2 ml to get 0.5 ml. Computation: 1 mg = 1000 mcg 0.5 mg : 2 ml = .125 mg : x ml 5. The recommended IV dose of gentamicin (Garamycin) is 1 to 5 mg/kg. What is a safe range to administer to an adult man weighing 190 pounds? A. 66 to 411 mg B. 86 to 431 mg C. 106 to 451 mg D. 126 to 471 mg Correct answer: • B. 86 to 431 mg Rationale: • Convert 190 lbs to kg by dividing it by 2.2 to get 86.36 kg. • Multiply 1 to 5 mg/kg to 86.36 kg to get 86 to 431 mg/kg
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