Dosage Practice Question and Answers PDF

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Practice questions for nursing dosage homework help. With work shown and answers provided to practice....

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Dosage Calculations ANSWERS Basic dosage questions 1. The provider orders furosemide 10mg IVP now. The drug is available as 40mg/5mL. What volume will the nurse administer to deliver the ordered dose? mL= 5mL/40mg X 10mg= 1.3 mL. IV drips by gravity and IV pump 2. Albumin 250 mL is ordered to be infused over 30 minutes. The drop factor is 10 gtt/mL. Calculate the flow rate needed to infuse the total amount of Albumin in 30 minutes. gtt/min= 10gtt/1mL X 250mL/30 min= 83 gtt/min 3. The provider orders levetiracetam 500mg IVPB to be delivered in 15 minutes. The drug is mixed in 100mL of D5W. What rate will you program the pump for this order? mL/hr= 100mL/15min X 60min/1 hr= 400mL/hr. 4. The provider orders acyclovir 44mg/hr IV. The concentration available from the pharmacy is acyclovir 1gm/250mL of NS. What rate will you program the IV pump to deliver the ordered dose? mL/hr= 250mL/1gm X 1gm/1000mg X 44mg/1hr= 11mL/hr. Safe dosage range/weight-based/pediatric safe ranges 5. The NP orders acetaminophen 200 mg oral every 4-6 hours for a child weighing 43 lb. The recommended dose range for acetaminophen is 50-240mg/kg/24 hours, with doses given every 4-6 hours. The acetaminophen is available in a 150 mg/5 mL concentration. a. How many milligrams per kilogram per 24 hours is the patient receiving? 200mg/19.545454 X 4 doses= 41 mg/kg/24 hr – 200mg/19.545454 X 6 doses= 61 mg/kg/24hr b. Is the order safe? No c. If yes, what volume will be administered for each dose? mL=5mL/150mg X 200mg= 6.7 mL 6. The recommended safe dosage of doxycycline for a child is 4 mg/kg/day divided every 12 hours. The daily maximum is 200mg. The child’s weight is 83 lb. The medication is supplied in a 60mL bottle prepared with a concentration of 25 mg/5mL. a. Calculate the safe dose for this child. 151 mg/day, 75 mg/dose. b. What volume will be administered for each dose? 15 mL

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6 types of critical care questions 7. Calculating the IV flow rate of medications ordered in milligrams per minute: Lidocaine 1 g has been added to 500 mL of D5W. The order states to infuse the lidocaine at 4 mg/min. What rate will be programmed into the IV pump? mL/hr= 500mL/1gm X 1gm/1000mg X 4mg/1min X 60min/1 hr= 120mL/hr 8. Calculating the IV flow rate of medications ordered in micrograms per minute: 100 mg of nitroglycerin has been added to 500 mL of 0.9% NS. The order is to infuse the nitroglycerin at 5 mcg/min. What rate will be programmed into the IV pump? mL/hr= 500mL/100mg X 1mg/1000mcg X 5mcg/1min X 60min/1 hr= 1.5mL/hr 9. Calculating the IV flow rate of medications in micrograms per kilogram per minute: 200 mg of dopamine is added to 250 mL of 0.9% NS. The order is to begin the infusion at 3 mcg/kg/min. The patient’s weight is 70 kg. What rate will be programmed into the IV pump? mL/hr= 250mL/200mg X 1mg/1000mcg X 3mcg/ kgmin X 70kg X 60min/1hr= 15.8 mL/hr 10. Calculating the milligrams per minute of medications from the IV flow rate: A patient is receiving lidocaine at 60 mL/h. The concentration of lidocaine is 1 gr in 250 mL of D5W. The nurse needs to calculate the dose in mg per minute the patient is receiving. mg/min= 1000mg/1gm X 1gm/250mL X 60mL/1hr X 1hr/60min= 4 mg/min 11. Calculating the micrograms per minute of medications from the IV flow rate: A patient is receiving nitroglycerin at 5 mL/hr. The concentration of nitroglycerin is 50 mg in 500 mL of 0.9% NS. The nurse needs to calculate the dose in mcg per minute the patient is receiving. mcg/min= 1000mcg/1mg X 50mg/500mL X 5mL/1 hr X 1 hr/60min= 8.3 mcg/min 12. Calculating the micrograms per kilogram per minute of medications from the IV flow rate: A patient is receiving dopamine at 12 mL/h. The concentration of dopamine is 400 mg in 250 mL of 0.9% NS. The patient’s weight is 154 pounds. The nurse needs to calculate the weight-based dose in mcg per minute the patient is receiving. mcg/kg/min= 1000mcg/1mg X 400mg/250mL X 12mL/hr X 1hr/60min X 2.2lb/1kg X 1/154lb= 4.6 mcg/kg/min Additional Practice Questions

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13. The provider orders dopamine 5mcg/kg/min IV. The pharmacy has closed for the evening requiring you to mix this IV drip. Available is a vial containing 400mg of dopamine with a concentration of 40mg/mL. The drug reference instructs you to dilute 400mg of dopamine in 250 mL of NS. Your patient weighs 110 pounds. a. What volume will you draw up from the vial to make this IV? mL= 1mL/40mg X 400mg= 10 mL b. What rate will you set the IV pump to deliver the ordered dose? mL/hr= 250mL/400mg X 1mg/1000mcg X 5mcg/kg/min X 1kg/2.2lb X 110lb X 60min/1hr= 9.4 mL/hr 14. A patient is receiving dobutamine at 16 mL/h. The concentration of dobutamine is 400 mg/250 mL of D5W. The patient weighs 190 pounds. What dose will the patient receive in mcg/kg/min? mcg/kg/min= 1000mcg/1mg X 400mg/250mL X 16mL/1hr X 1hr/60min X 2.2lb/1kg X 1/190lb= 4.9mcg/kg/min 15. The provider has written orders to initiate a diltiazem drip on your patient. The order reads: “Give diltiazem bolus of 0.25mg/kg IVP over 2 minutes. Continuous infusion to start immediately following the bolus dose at an initial rate of 10mg/hr.” Your patient weighs 220 pounds. The pharmacy sends a vial for the IV push bolus and an IV drip for the continuous infusion. This is the label on the vial for the IV push bolus dose:

a. What volume will you draw up to administer the bolus dose? mL= 10mL/50mg X 0.25mg/1kg X 1kg/2.2lb X 220lb=5mL This is the IV available for the continuous infusion.

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b. What rate will you program the IV pump for to start the continuous infusion? mL/hr= 125mL/125mg X 10mg/1hr= 10mL/hr 16. A patient is ordered a norepinephrine infusion to be initiated at 8 mcg/min. The concentration is norepinephrine 2 mg in 250 mL of 0.9% NS. At what rate will the IV pump be programmed? mL/hr= 250mL/2mg X 1mg/1000mcg X 8mcg/min X 60 min/1hr =60mL/hr 17. The recommended safe dose of rifampin for a child is 5 mg/kg/dose. The child’s weight is 30 lb. The medication is supplied in 10 mg/mL. a. Calculate the safe dose for this child. 5mg X 13.6363kg= 68 mg b. What volume will be administered for each dose? mL= 1mL/10mg X 68 mg = 6.8 mL 18. The physician orders cephalexin 250 mg oral every 6 hours for a child weighing 50 lb. Cephalexin is available in a 250 mg/5 mL concentration. The recommended dose is 50 to 100 mg/kg/24 h divided in four doses. a. How many milligrams per kilogram per 24 hours is the patient receiving? mg/kg/day= 250mg/6hr X 24hr/1day X 2.2lb/1kg X 1/50lb= 44 mg/kg/24 hours b. Is the order within the recommended dose range? No – too small 19. The PA orders a continuous infusion of regular insulin at at 10 units/hour. The available medication is 500 units in 500mL of 0.9% normal saline. What rate will the IV pump be program for? mL/hr= 500mL/500u X 10u/hr= 10 mL/hr 20. A patient with a PE has a heparin infusion currently infusing at 12mL/hr. At the beginning of your shift you need to check that this is the correct dose. The concentration of heparin is 25,000 units in 250 mL of D5W. What dose of heparin is this patient currently receiving? u/hr= 25,000u/250mL X 12mL/1hr= 1200 units/hr

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21. The NP orders nitroprusside for your patient to begin at 4 mcg/kg/min. This patient weighs 140 pounds. Pharmacy sends you an IV bag containing 50 mg of nitroprusside in 250 mL of D5W. What will you program the IV pump for to deliver the ordered dose? mL/hr= 250mL/50mg X 1mg/1000mcg X 4mcg/kg/min X 1kg/2.2lb X 140lb X 60min/1hr= 76.4 mL/hr 22. Your patient in the ICU is intubated and on the ventilator. Propofol is infusing at 18 mL/hr and your patient weighs 75kg. The concentration of propofol is 15mg/mL. What dose of propofol, in mcg/kg/min, is your patient receiving? mcg/kg/min= 1000mcg/1mg X 15mg/1mL X 18mL/1hr X 1hr/2.2kg X 1/75kg= 60mcg/kg/min 23. A patient with septic shock is receiving norepinephrine at 10 mcg/min. The concentration of norepinephrine is 4 mg in 250 mL of NS. What rate should the IV pump be program for to deliver this dose? mL/hr= 250mL/4mg X 1mg/1000mcg X 10mcg/1min X 60min/1hr= 37.5mL/hr 24. Pharmacy delivers a new bag of norepinephrine for the patient in question 23. The concentration of this new IV bag of norepinephrine is 8 mg in 250 mL of NS. What rate do you need to program the IV pump for to continue giving 10 mcg/min? mL/hr= 250mL/8mg X 1mg/1000mcg X 10mcg/1min X 60min/1hr= 18.8mL/hr 25. A patient with cardiac arrhythmia is ordered to receive procainamide at 4mg/min. The concentration is 4gm in 250 mL of D5W. What rate should the IV pump be programed for to deliver this dose? mL/hr= 250mL/4gm X 1gm/1000mg X 4mg/1min X 60min/1hr= 15mL/hr...