Parenteral Medications Dosage Calculations (Part 3: 50 Items)| 21/2022 UPDATE

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: 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. • Answer: (1.1) mL. Incorrect Correct answer: • 1.1 mL. Formula: Rationale: • Use standard formula above. • Divide 0.3 g (desired dose) with 280 mg/ml (drug on hand) to get 0.0011. • Multiply 0.0011 mg to 1,000 mg, then multiply with 1 ml (vehicle) to get 1.1 ml. Computation: 7. 7. Question A health care provider orders tobramycin 1.25 mg/kg IM q 12 hr. Available on hand is tobramycin 0.2 g/mL. How many mL will you administer to a 183 lbs patient for each dose? Fill in the blanks and write your answer using one decimal place. • Answer: (0.5) mL. Incorrect Correct Answer: • 0.5 mL. Formula: Rationale: • Convert 183 lbs to kilograms by dividing it with 2.2 to get 83.2 kg. • Multiply 83.2 kg with 1.25 mg/kg to get 104 mg. • Use the standard formula above. • Divide 104 mg (desired dose) with 0.2 g/ml (drug on hand), then divide by 1,000 to get 0.52 ml. • Finally, round it off to one decimal place to get 0.5 ml. Computation: 183 lb = 83.2 kg 83.2 kg x 1.25 mg/kg = 104 mg 8. 8. Question A health care provider prescribes Heparin 4,390 units subq bid; Available: Heparin 5,000 USP units per ml in 10 ml. How many mL will you administer? Fill in the blanks and record your final answer using two decimal places. • Answer: (0.88) mL. Incorrect Correct answer: • 0.88 mL. Formula: Rationale: • Use the standard formula above. • Divide 4,390 units (desired dose) with 5,000 units (drug on hand), then multiply by 1 ml (vehicle) to get 0.878 ml. • Finally, round it off to two decimal places to get 0.88 ml. Computation: 9. 9. Question A health care provider orders Penicillin G 223,500 units IM q 4 hr; Available: Penicillin G 500,000 units /2.5 mL. How many mL will you administer? Fill in the blanks. Record your answer using one decimal place. • Answer: (1.1) mL. Incorrect Correct answer: • 1.1 mL. Formula: Rationale: • Use the standard formula above. • Divide 223,500 units (desired dose) with 500,000 units (drug on hand) to get 0.447 units. • Then, multiply 0.447 units to 2.5 ml (vehicle) to get 1.1175 ml. • Finally, round it off to one decimal place to get 1.1 ml. Computation: 10. 10. Question A health care provider orders amikacin (Amikin) 5 mg/ lb IM q 12 hr; Available: Amikacin 0.9 gm/ 2 mL. How many mL will you administer to a 72.7 Kg patient? Fill in the blanks. Record your answer using one decimal place. • Answer: (1.8) mL. Incorrect Correct answer: • 1.8 mL. Formula: Rationale: • Convert 72.7 kg to lbs by multiplying it with 2.2 to get 160 lbs. • Multiply 5 mg/lb to 160 lbs to get 800 mg. • Divide 800 mg (desired dose) with 0.9 gm (drug on hand) to get 888.9. • Divide 888.9 mg with 1,000 mg to get 0.89 mg. • Multiply 0.89 mg to 2 ml (vehicle) to get 1.78 ml. • Finally, round it off to one decimal place to get 1.8 ml. Computation: 72.7 x 2.2 = 160 lb 5 mg/lb x 160 lb = 800 mg (per dose) 11. 11. Question A health care provider orders fentanyl (Sublimaze) 0.05 mg IV bolus; Reconstitution instructions: Constitute to Fentanyl 100 micrograms/2.3 mL with 2.4 mL of 5% Dextrose Water for Injection. How many mL will you administer? Fill in the blanks. Record your answer using one decimal place. • Answer: (1.2) mL. Incorrect Correct answer: • 1.2 mL. Formula: Rationale: • Use the standard formula above. • Divide 0.05 mg (desired dose) with 100 mcg (drug on hand) to get 0.0005 mg. • Multiply 0.0005 mg with 1,000 mcg to get 0.5 mg. • Multiply 0.5 mg to 2.3 ml (vehicle) to get 1.15 ml. • Finally, round it off to one decimal place to get 1.2 ml. Computation: 12. 12. Question A health care provider prescribes cefazolin (Ancef) 0.4253 gm IM bid; Reconstitution instructions: For IM solution add 1.25 mL of diluent. Shake to dissolve. Provides an approximate volume of 1.6 mL (240 mg/mL). How many mL will you give? Fill in the blanks. Record your answer using one decimal place. • Answer: (1.8) mL. Incorrect Correct answer: • 1.8 mL. Formula: Rationale: • Use the standard formula above. • Divide 0.4253 gm (desired dose) with 240 mg (drug on hand) to get 0.00177 . • Multiply 0.00177 mg with 1,000 mg to get 1.77 mg. • Multiply 1.77 mg with 1 ml (vehicle), then round off to one decimal place to get 1.8 ml. Computation: 13. 13. Question A health care provider orders Morphine gr 1/10; Available: Morphine 10 mg/ml. How many ml will the nurse give? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.6) mL. Incorrect Correct answer: • 0.6 mL. Formula: Rationale: • 1/10 g is equal to 6 mg. • Use the standard formula above. • Divide 6 mg (desired dose) with 10 mg (drug on hand), then multiply by 1 ml (vehicle) to get 0.6 ml. Computation: 14. 14. Question A health care provider orders Morphine gr 1/10; Available: Morphine 10 mg/ml. How many ml will the nurse give? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.6) mL. Incorrect Correct answer: • 0.6 mL. Formula: Rationale: • 1/10 g is equal to 6 mg. • Use the standard formula above. • Divide 6 mg (desired dose) with 10 mg (drug on hand), then multiply by 1 ml (vehicle) to get 0.6 ml. Computation: 15. 15. Question A health care provider orders promethazine (Phenergan) for a child whose BSA is 1.2 m2. The usual adult dose is 25 mg. How many milligrams would the nurse administer for the dose? Fill in the blanks. Record your answer using one decimal place. • Answer: (17.6) mg Incorrect Correct answer: • 17.6 mg Formula: BSA Formula: Rationale: • Use the BSA formula above. • Multiply 1.2 m2(child’s BSA) with 25 mg (adult dose) to get 30 mg. • Divide 30 mg by 1.7 m2to get 17.6 mg. Computation: 16. 16. Question A patient with complaints of chest pain is ordered to receive diltiazem (Cardizem) 5 mg IVP. The vial contains 10 mg/2 ml. How many ml will you give? Fill in the blanks. • Answer: (1) mL. Incorrect Correct answer: • 1 mL. Formula: Rationale: • Use the standard formula above. • Divide 5 mg (desired dose) with 10 mg (drug on hand) to get 0.5 mg. • Multiply 0.5 mg to 2 ml (vehicle) to get 1 ml. Computation: 10 mg : 2 ml = 5 mg : x ml 10 x = 10 x = 1 17. 17. Question 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. • Answer: (0.5) mL. Incorrect 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 18. 18. Question 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. • Answer: (1) mL. Incorrect 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 19. 19. Question A patient with bacterial infection is ordered ceftazidime (Fortaz) 250 mg IM. The vial contains 500 mg powder with directions to add 1.5 ml of sterile water for a total volume of 1.8 ml. How many ml will you administer? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.9) mL. Incorrect Formula: Rationale: • Divide 250 mg (desired dose) with 500 mg (drug on hand) to get 0.5 mg. • Multiply 0.5 mg to 1,8 ml to get 0.9 ml. Computation: 500 mg : 1.8 ml = 250 mg : x ml 20. 20. Question You need to administer prochlorperazine (Compazine) 10 mg IM to a nauseated patient. You have on hand Compazine 5 mg/mL. How many ml would you administer per dose? Fill in the blanks. Record your answer to the nearest whole number. • Answer: (2) mL. Incorrect Correct answer: • 2 mL. Formula: Rationale: • Use the standard formula above. • Divide 10 mg (desired dose) with 5 mg (drug on hand), then multiply with 1 ml to get 2 ml. Computation: 21. 21. Question An order reads furosemide (Lasix) 40 mg IV push. You have on hand Lasix 20 mg/2 mL. How many ml would you administer per dose? Fill in the blanks. • Answer: (4) mL. Incorrect Correct answer: • 4 mL. Formula: Rationale: • Use the standard formula above. • Multiply 40 mg (desired dose) to 2 ml (vehicle) to get 80 ml. • Then, divide 80 ml with 20 mg to get 4 ml. Computation: 22. 22. Question You need to administer 15 mg of morphine IM. It is supplied as gr 1/6 per mL. How many ml would you administer per dose? Fill in the blanks. Record your answer using one decimal place. • Answer: (1.5) mL. Incorrect Correct answer: • 1.5 mL. Formula: Rationale: • 1 gr is equal to 60 mg. • Multiply 15 mg (desired dose) to 1 gr and divide by 60 mg to get 0.25. • Multiply 0.25 by 1 ml then divide by ? gr to get 1.5 ml. Computation 23. 23. Question You have on hand diazepam (Valium) 5 mg/mL. You need to administer 8 mg IV push stat. to a patient having a seizure. How many ml should you draw into the syringe? Fill in the blanks. Record your answer using one decimal place. • Answer: (1.6) mL. Incorrect Correct answer: • 1.6 mL. Formula: Rationale: • Use the standard formula above. • Multiply 8 mg (desired dose) by 1 ml (vehicle), then divide by 5 mg (drug on hand) to get 1.6 ml. Computation: 24. 24. Question A safe maintenance dose of aminophylline is 0.36 mg/kg/hour. It is supplied as 100 mg/100 mL. Your patient is 130 pounds and is receiving 20 mL/hour. Is the dose safe? • A. patient is receiving 20 mg/hour; yes, dose is safe • B. patient is receiving 20 mg/hour; yes, dose is not safe • C. patient is receiving 40 mg/hour; yes, dose is safe • D. patient is receiving 40 mg/hour; yes, dose is not safe Incorrect Correct answer: • A. patient is receiving 20 mg/hour; yes, dose is safe Formula: Rationale: • Convert 130 lbs to kg by dividing it by 2.2 to get 59 kg. • Multiply 0.36 mg/kg to 59 kg to get 21.24 mghr. • Use the standard formula above. • Multiply 20 ml by 100 mg to get 2,000 mg. • Divide 2,000 mg by 100 ml to get 20 mg/hr. Because you have to compare a safe dose to the patient’s dose, you have to do two separate calculations: 25. 25. Question You have an order for 500 mg vancomycin (Vancocin) IVPB every 6 hours for a patient who weighs 120 lbs. You know that you can safely administer up to 40 mg/kg/day. Is the order safe? • A. patient is receiving 36.7 mg/kg/day • B. patient is receiving 9.2 mg/kg/day • C. patient is receiving 40.0 mg/kg/day • D. patient is receiving 18.4 mg/kg/day Incorrect Correct answer: • A. patient is receiving 36.7 mg/kg/day Formula: Rationale: • Convert 120 lbs to kg by dividing it by 2.2 to get 54.5 kg. • Divide 500 mg with 54.5 kg to get 9.17 mg. • Multiply 9.17 mg to 4 doses per day to get 36.7 mg/kg/day. Computation: *36.7 mg/kg is less than the safe dose of 40 mg/kg, so it is safe. 26. 26. Question Your order reads penicillin 1.2 million units IM daily. You have penicillin 500,000 units/mL. How many ml should you prepare the correct dose? Fill in the blanks. Record your answer using one decimal place. • Answer: (2.4) mL. Incorrect Correct answer: • 2.4 mL. Formula: Rationale: • Use the standard formula above. • Multiply 1.2 million units (desired dose) to 1 ml (vehicle), then divide by 500,000 units (drug on hand) to get 2.4 ml. Computation: 27. 27. Question Your order reads labetalol 40 mg IV push every 10 minutes until blood pressure is lower than 140/90 mm Hg. You have labetalol 5 mg/mL available. How many ml should you prepare the correct dose? Fill in the blanks. Record your answer to the nearest whole number. • Answer: (8) mL. Incorrect Correct answer: • 8 mL. Formula: Rationale: • Use the standard formula above. • Multiply 40 mg (desired dose) to 1 ml (vehicle), then divide with 5 mg to get 8 ml. Computation: 28. 28. Question You have on hand enoxaparin (Lovenox) 30 mg/0.3 mL. You need to administer 1 mg/kg SC. Your patient weighs 200 pounds. How many ml will you draw into a syringe? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.9) mL. Incorrect Correct answer: • 0.9 mL. Formula: Rationale: • Convert 200 lbs to kg by dividing it with 2.2 to get 90.9 kg. • Multiply 1 mg/kg to 90.9 kg to get 90.9 mg/kg. • Use the standard formula above. • Divide 90.9 mg (desired dose) with 30 mg (drug on hand) to get 3.03 mg. • Multiply 3.03 mg with 0.3 ml (vehicle) to get 0.9 ml. Computation: 29. 29. Question Atropine 0.6 mg IM is ordered preoperatively. It is supplied as 0.4 mg/mL. How many milliliters should you administer? Fill in the blanks. Record your answer using one decimal place. • Answer: (1.5) mL. Incorrect Correct answer: • 1.5 mL. Formula: Rationale: • Use the standard formula above: • Multiply 0.6 mg (desired dose) to 1 ml ( vehicle), then divide by 0.4 mg to get 1.5 ml. Computation: 30. 30. Question A health care provider orders morphine sulfate (Roxanol) 2 mg IV push to a patient experiencing shortness of breath due to chronic lung disease. It is supplied as gr 1/6 /mL. How many milliliters should you administer? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.2) mL. Incorrect Correct answer: • 0.2 mL. Formula: Rationale: • ? gr is equal to 10 mg. • Use the standard formula above. • Multiply 2 mg (desired dose) to 1 ml (vehicle), then divide by 10 mg (drug on hand) to get 0.2 ml. Computation: 31. 31. Question You have an order for diphenhydramine hydrochloride (Benadryl) 40 mg IM now. You have on hand Benadryl 25 mg/mL. How many milliliter(s) do you prepare? Fill in the blanks and record your answer using one decimal place. • Answer: (1.6) mL. Incorrect Correct answer: • 1.6 mL. Formula: Rationale: • Use the standard formula above. • Multiply 40 mg (desired dose) to 1 ml (vehicle), then divide by 25 mg (drug on hand) to get 1.6 ml. Computation: 32. 32. Question A health care provider prescribes phenobarbital (Luminal) supplied as 60 mg/mL. You need to administer 160 mg IV stat. How many milliliters should you administer? Fill in the blanks. Record your answer using one decimal place. • Answer: (2.7) mL. Incorrect Correct answer: • 2.7 mL. Formula: Rationale: • Use the standard formula above. • Multiply 160 mg (desired dose) to 1 ml (vehicle), then divide by 60 mg (drug on hand) to get 2.66 ml. • Round it off to one decimal place to get 2.7 ml. Computation: 33. 33. Question You have an order for morphine 4 mg IV push every 2 hours prn dyspnea. You have morphine gr 1/6 per mL on hand. How many milliliters should you prepare? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.4) mL. Incorrect Correct answer: • 0.4 mL. Formula: Rationale: • 1/6 gr is equal to 10 mg. • Use the standard formula above. • Multiply 4 mg (desired dose) to 1 ml (vehicle), then divide by 10 mg (drug on hand) to get 0.4 ml. Computation: 34. 34. Question You need to administer amphotericin B (Fungizone) 0.5 mg/kg IV daily to a patient with histoplasmosis who weighs 236 pounds. How many milligrams should you expect to administer each day? Fill in the blanks. Record your answer using one decimal place. • Answer: (53.6) mg Incorrect Correct answer: • 53.6 mg Rationale: • Convert 236 lbs to kg by dividing it by 2.2 to get 107.2 kg. • Multiply 0.5 mg/kg to 107.2 kg to get 53.6 mg. Computation: 35. 35. Question 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 Incorrect 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. Computation: *The safe range is between 86 and 431 mg. 36. 36. Question 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. • Answer: (8) mL. Incorrect Correct answer: • 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: 37. 37. Question You have an order for heparin 3000 units SC every 12 hours. You have available 5000 units/mL. How many milliliters will you give? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.6) mL. Incorrect Correct answer: • 0.6 mL. Formula: Rationale: • Use the standard formula above. • Multiply 3,000 units (desired dose) to 1 ml (vehicle), then divide with 5,000 units to get 0.6 ml. Computation: 38. 38. Question You need to administer 15 mg of morphine IM. You have on hand gr 1/4 per mL. How should you prepare the correct dose? Fill in the blanks. • Answer: (1) mL. Incorrect Correct answer: • 1 mL. Formula: Rationale: • ¼ gr is equal to 16 mg. • Use the standard formula above. • Multiply 15 mg (desired dose) to 1 ml (vehicle), then divide by 16 mg (drug on hand) to get 0.9 ml or 1 ml. Computation: 39. 39. Question Your patient has an order for heparin SC 2500 units bid. You have on hand heparin 5000 units/mL. How many milliliters will you administer in a day? Fill in the blanks. Record your answer to the nearest whole number. • Answer: (1) mL. Incorrect Correct Answer: • 1 mL. Formula: Rationale: • Use the standard formula above. • Multiply 2,500 units (desired dose) to 1 ml (vehicle), then divide by 5,000 units to get 0.5 ml. • Then, multiply 0.5 ml to 2 doses per day to get 1 ml. Computation: 40. 40. Question The physician orders codeine gr ¼ IM every 4 hours prn for a patient with pain. You have on hand codeine gr 1/2 per mL. What is the correct dose? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.5) mL. Incorrect Correct answer: • 0.5 mL. Formula: Rationale: • ¼ gr is equal to 16 mg. • ½ gr is equal to 32 mg. • Use the standard formula above. • Multiply 16 mg (desired dose) to 1 ml (vehicle), then divide by 32 mg (drug on hand) to get 0.5 ml. Computation: *1 gr = 60 mg 41. 41. Question A patient is receiving 250,000 units of penicillin G (Pfizerpen) IM every 6 hours. You have on hand 300,000 units/mL. How much will you draw into the syringe? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.8) mL. Incorrect Correct answer: • 0.8 mL. Formula: Rationale: • Use the standard formula above. • Multiply 250,000 units (desired dose) to 1 ml (vehicle), then divide by 300,000 units (drug on hand) to get 0.8 ml. Computation: 42. 42. Question You need to administer lorazepam (Ativan) 3 mg IM to an agitated patient. You have on hand 4 mg/mL. How much do you prepare in ml? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.8) mL. Incorrect Correct answer: • 0.8 mL. Formula: Rationale: • Use the standard formula above. • Multiply 3 mg (desired dose) to 1 ml (vehicle), then divide by 4 mg (drug on hand) to get 0.75 ml. • Finally, round it off to one decimal place to get 0.8 ml. Computation: 43. 43. Question You need to administer 125 mg of methylprednisolone sodium succinate (Solu-Medrol) IV push bid to a patient with acute exacerbation of chronic obstructive pulmonary disease. You have on hand 40 mg/mL. How much do you prepare in ml? Fill in the blanks. Record your answer using one decimal place. • Answer: (3.1) mL. Incorrect Correct answer: • 3.1 mL. Formula: Rationale: • Use the standard formula above. • Multiply 125 mg (desired dose) to 1 ml (vehicle), then divide by 40 mg (drug on hand) to get 3.1 ml. Computation: 44. 44. Question You have on hand penicillin 300,000 units/mL. Your order reads penicillin 1,000,000 units IM. How will you fill the syringe in ml? Fill in the blanks. Record your answer using one decimal place. • Answer: (3.3) mL. Incorrect Correct answer: • 3.3 mL. Formula: Rationale: • Use the standard formula above. • Multiply 1,000,000 units (desired dose) to 1 ml (vehicle), then divide by 300,000 units to get 3.3 ml. Computation: 45. 45. Question Your patient needs 12,000 units of heparin SC. You have on hand 5000 units/mL. How much will you inject? Fill in the blanks. Record your answer using one decimal place. • Answer: (2.4) mL. Incorrect Correct answer: • 2.4 mL. Formula: Rationale: • Use the standard formula above. • Multiply 12,000 units (desired dose) to 1 ml (vehicle), then divide by 5,000 units (drug on hand) to get 2.4 ml. Computation: 46. 46. Question You have on hand atropine 0.4 mg/mL. You need to administer atropine gr 1/150 IM. How many milliliters will you prepare? Fill in the blanks. • Answer: (1) mL. Incorrect Correct answer: • 1 mL. Formula: Rationale: • 1/150 gr is equal to 0.4 mg. • Multiply 0.4 mg (desired dose) to 1 ml (vehicle), then divide by 0.4 mg (drug on hand) to get 1 ml. Computation: 47. 47. Question The physician orders meperidine (Demerol) 75 mg IM every 4 to 6 hours prn for a patient admitted with acute cholecystitis. You have on hand meperidine 50 mg/mL. How much will you give? Fill in the blanks. Record your answer using one decimal place. • Answer: (1.5) mL. Incorrect Correct answer: • 1.5 mL. Formula: Rationale: • Use the standard formula above. • Multiply 75 mg (desired dose) to 1 ml (vehicle), then divide by 50 mg (drug on hand) to get 1.5 ml. Computation: 48. 48. Question A patient is receiving 60 mg of methylprednisolone (Medrol) IM every 8 hours. You have on hand 75 mg/mL. How much will you draw up? Fill in the blanks. Record your answer using one decimal place. • Answer: (0.8) mL. Incorrect Correct answer: • 0.8 mL. Formula: Rationale: • Use the standard formula above. • Multiply 60 mg (desired dose) to 1 ml (vehicle), then divide by 75 mg (drug on hand) to get 0.8 ml. Computation: 49. 49. Question A patient is admitted to the emergency room with a fractured leg. The physician orders morphine 15 mg IM stat. You have on hand morphine 10 mg/mL. How many milliliters will you administer? Fill in the blanks. • Answer: (1.5) mL. Incorrect Correct answer: • 1.5 mL. Formula: Rationale: • Use the standard formula above. • Multiply 15 mg (desired dose) to 1 ml (vehicle), then divide by 10 mg (drug on hand) to get 1.5 ml. Computation: 50. 50. Question 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. • Answer: (2.6) mL. Incorrect 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: