# Drug Dosage Calculations NCLEX Exam 2

- October 24, 2020/

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## Text Mode

Text Mode – Text version of the exam

1. Doctor’s order: Amoxicillin 0.25 g p.o. every 8 hours; Available: Amoxicillin 125 mg tablets. How many tablets will the nurse give per dose?

- 0.5 tab
- 1 tab
- 1.5 tabs
- 2 tabs

2. Doctor’s order: Zofran 8 mg p.o. t.i.d.; Available: Zofran in a 100 ml bottle labeled 4 mg/tsp.; How many ml will the nurse administer for each dose?

- 1.25 ml
- 6.25 ml
- 8 ml
- 10 ml

3. Doctor’s order: Morphine gr 1/10; Available: Morphine 10 mg/ml. How many ml will the nurse give?

- 0.6 ml
- 1 ml
- 6 ml
- 10 ml

4. Give Fortaz mg/kg/day p.o. 50 mg/kg p.o. t.i.d. to a child who weighs 25.5 kg. Fortaz is available in an oral suspension labeled 100 mg/ml. How many ml would the nurse administer per dose?

- 0.5 ml
- 0. 8 ml
- 10.8 ml
- 12.8 ml

5. Give Ceclor 45 mg/kg/day p.o. in 3 divided doses for a patient who weighs 66 pounds. A 75 ml stock medication is labeled Ceclor 125 mg/ml. How many ml would the nurse administer per dose?

- 0.5 ml
- 0.8 ml
- 3.6 ml
- 9 ml

6. Give Biaxin for a child whose BSA is 0.55 m2. The usual adult dose is 500 mg. Biaxin is available in an oral suspension. The 100ml bottle is labeled 50 mg/ml. How many ml would the nurse give per dose?

- 3.2 ml
- 1.6 ml
- 1.2 ml
- 5 ml

7. Give 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?

- 12 mg
- 17.6 mg
- 20.8 mg
- 25 mg

8. LR 125 ml/hr via gravity flow using tubing calibrated at 15 gtt/ml. Calculate the flow rate.

- 8 gtt/min
- 15 gtt/min
- 25 gtt/min
- 31 gtt/min

9. One liter NS to infuse over 24 hours using a micro drip (gravity flow). Calculate the flow rate.

- 42 gtt/min
- 28 gtt/min
- 12 gtt/min
- 10 gtt/min

10. At the change of shift you notice 200 ml left to count in the I.V. bag. The I.V. is infusing at 80 ml/hr. How much longer will the I.V. run?

- 1 hr
- 1 hr and 30 mins
- 2 hrs
- 2 hrs and 30 mins

11. Keflin 2 g in 100 ml D5W IVPB over 20 minutes. The I.V. tubing is 15 gtt/ml. Calculate the flow rate.

- 150 gtt/min
- 100 gtt/min
- 75 gtt/min
- 76 gtt/min

12. The physician writes an order for Heparin 900 units/hour. The label on the I.V. bag reads: Heparin 10,000 units in 500 ml D5W. How many ml/hr will deliver the correct dose?

- 11 ml/hr
- 45 ml/hr
- 50 ml/hr
- 55 ml/hr

13. Administer Heparin 1,000 units/hr from an I.V. bag mixed 40,000 units in 1 L D5W. How many ml/hr will deliver the correct amount of Heparin?

- 40 ml/hr
- 30 ml/hr
- 25 ml/hr
- 15 ml/hr

14. The patient’s Heparin is infusing at 28 ml/hr on an infusion pump. The bag of fluid is mixed 20,000 units of Heparin in 500 ml D5W. What hourly dose of heparin is the patient receiving?

- 1,120 units/hr
- 1,210 units/hr
- 2,120 units/hr
- 2,210 units/hr

15. The patient’s heparin drip is infusing at 11 ml/hr on an infusion pump. The bag of fluid is mixed 25,000 units of Heparin in 250 ml D5W. What hourly dose of Heparin is the patient receiving?

- 2,500 units/hr
- 2,000 units/hr
- 1,000 units/hr
- 1,100 units/hr

16. Give Regular insulin by continuous I.V. infusion at 20 units/hr. The solution is 250 ml NS with 100 units of Regular insulin. What rate on the infusion pump will deliver the correct dose?

- 5 ml/hr
- 8 ml/hr
- 50 ml/hr
- 100 ml/hr

17. Administer a Theophylline drip at 40 mg/hr The solution is 250 ml D5W + Theophylline 500 mg. What rate on the infusion pump will deliver the correct dose?

- 20 ml/hr
- 40 ml/hr
- 80 ml/hr
- 100 ml/hr

18. Give Tridil 15 mcg/min. Tridil is mixed 50 mg in 500 ml D5W. What rate on the infusion pump will deliver the correct dose?

- 150 ml/hr
- 15 ml/hr
- 90 ml/hr
- 9 ml/hr

19. Give propofol 10 mcg/kg/minute. The infusion is mixed propofol 250 mg in 250 ml D5W. The patient weighs 168 pounds. What rate on the infusion pump will deliver the correct dose?

- 10 ml/hr
- 26 ml/hr
- 46 ml/hr
- 50 ml/hr

20. Give Nitroprusside 5 mcg/kg/minute via continuous infusion for a patient weighing 205 lbs. Nitroprusside is available in a solution of 200 mg in 250 ml D5W. What rate on the infusion pump will deliver the correct dose?

- 25 ml/hr
- 35 ml/hr
- 45 ml/hr
- 50 ml/hr

21. Tridil is infusing at 15 ml/hr on an infusion pump. The drug is mixed 50 mg in 500 ml D5W. How many mcg/minute is the patient receiving?

- 25 mcg/min
- 35 mcg/min
- 45 mcg/min
- 50 mcg/min

22. A lidocaine drip is infusing at 30 ml/hr on an infusion device. The drug is mixed 2 g in 500 ml D5W. How many mg/minute is the patient receiving?

- 5 mg/min
- 4 mg/min
- 3 mg/min
- 2 mg/min

23. Aminophylline is infusing at 30 ml/hr. The drug is mixed 250 mg in 500 ml D5W. How many mg/hr is the patient receiving?

- 30 mg/hr
- 25 mg/hr
- 20 mg/hr
- 15 mg/hr

24. The cardiac patient is to receive Cardizem 5 mg IVP. The vial contains 10 mg/2 ml. How many ml will you give?

- 10 ml
- 5 ml
- 2 ml
- 1 ml

25. The patient is to take Aspirin gr. X. The bottle contains Aspirin 300 mg tablets. How many tablets should he take?

- 0.5 tablet
- 1 tablet
- 1.5 tablets
- 2 tablets

26. Digoxin 125 mcg is ordered IVP every a.m. The vial contains 0.5 mg in 2 ml. How many ml will you give?

- 0.2 ml
- 0.5 ml
- 1.5 ml
- 2 ml

27. The pre-op patient is ordered Atropine gr. 1/150 IM. The vial contains Atropine 0.4 mg in 1 ml. How much will you give?

- 1 ml
- 1.5 ml
- 2 ml
- 2.5 ml

28. The patient is to receive Heparin 1500 units/hr by IV infusion. The IV contains 25,000 units of Heparin in 250 ml of D5W. At what rate should you set the IV pump (ml/hr)?

- 15 ml/hr
- 16 ml/hr
- 17 ml/hr
- 20 ml/hr

29. The IV with Nitroglycerin is infusing at 6 ml/hr. The concentration of the IV is 50 mg in 250 ml of D5W. How many mg/hr is the patient receiving?

- 1.2 mg/hr
- 5.2 mg/hr
- 25 mg/hr
- 30 mg/hr

Situation: The patient is ordered an IV of 1000 ml of Normal Saline over 8 hours.

30. At what rate would you set the IV pump (ml/hr)?

- 125 ml/hr
- 250 ml/hr
- 100 ml/hr
- 2 ml/hr

31. How many drops per minute would you set the gravity IV tubing with a drip factor of 15 drops/ml?

- 35 gtts/min
- 19 gtts/min
- 31 gtts/min
- 15 gtts/min

32. If the current IV bag was started at 1:00, what time would you hang the next bag?

- 5:00
- 7:00
- 9:00
- 11:00

33. The patient with an infection is to receive an IVPB of Ampicillin 500 mg in 50 ml over 30 minutes. At what rate would you set the pump?

- 300 ml/hr
- 200 ml/hr
- 100 ml/hr
- 50 ml/hr

34. An IVPB of Vancomycin 1 gram in 250 ml is to infuse over 90 minutes. At what rate should the pump be set?

- 28 ml/hr
- 90 ml/hr
- 167 ml/hr
- 270 ml/hr

35. The patient is ordered 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?

- 5 ml
- 3.6 ml
- 2 ml
- 0.9 ml

36. The physician ordered an IV of Dobutamine at 5 mcg/Kg/min. The patient weighs 198 lbs. The IV solution is 500 mg Dobutamine in 250 ml D5W. How many ml/hr should the pump be set?

- 2.5 ml/hr
- 5 ml/hr
- 10 ml/hr
- 14 ml/hr

###### Answers and Rationales

1. Answer: D. 2 tabs

Formula:

Solution:

2. Answer: D. 10 ml

Formula:

Solution:

3. Answer: A. 0.6 ml

Formula:

Solution:

4. Answer: D. 12.8 ml

Formula:

Solution:

5. Answer: C. 3.6 ml

Formula:

Solution: 45 mg/kg/day x 30 kg = 1.350 mg/day ÷ 3 doses = 450 mg per dose

6. Answer: A. 3.2 ml

Formula:

BSA Formula:

Solution:

7. Answer: B. 17.6 mg

BSA Formula:

Solution:

8. Answer: D. 31 gtt/min

IV Flow Formula:

Solution:

9. Answer: A. 42 gtt/min

IV Flow Formula:

Solution:

10. Answer: D. 2 hrs and 30 mins

Solution: 200 ÷ 80 = 2.5 = 2 hrs and 30 mins

11. Answer: C. 75 gtt/min

IV Flow Formula:

Solution:

12. Answer: B. 45 ml/hr

Formula:

Solution:

13. Answer: C. 25 ml/hr

Formula:

Solution:

14. Answer: A. 1,120 units/hr

Solution:

15. Answer: D. 1,100 units/hr

Solution:

16. Answer: C. 50 ml/hr

Formula:

Solution:

17. Answer: A. 20 ml/hr

Formula:

Solution:

18. Answer: D. 9 ml/hr

1. Infusion device is set at hourly rate, so convert mcg/min to mcg/hr

15 mcg/min = 900 mcg/hr (15 x 60)

2. Drug is expressed in mg, so covert mcg to mg

900 mcg/hr = 0.9 mg/hr

3. Formula:

Solution:

19. Answer: C. 46 ml/hr

1. Convert lbs to kg

168 ÷ 2.2 = 76.36 = 76.4 kg

2. Calculate the minute rate

76.4 kg x 10 mcg/kg/min = 764 mcg/min

3. Calculate hourly rate

764 mcg/min x 60 mins/hr = 45,840 mcg/hr

4. Drug is expressed in mg, so convert mcg to mg

45,840 mcg = 45.84 mg

5. Formula:

Solution:

20. Answer: B. 35 ml/hr

1. Convert lbs to kg

205 ÷ 2.2 = 93.18 = 93.2 kg

2. Calculate the minute rate

93.2 kg x 5 mcg/kg/min = 466 mcg/min

3. Calculate hourly rate

466 mcg/min x 60 mins/hr = 27,960 mcg/hr

4. Drug is expressed in mg, so convert mcg to mg

27,960 mcg = 27.96 mg

5. Formula:

Solution:

21. Answer: A. 25 mcg/min

1. Convert 50 mg to mcg = 50,000 mcg

2. Use ratio/proportion to solve

x = 1,500 mcg/hr

3. Calculate the minute rate

1,500 mcg/hr ÷ 60 mins/hr = 25 mcg/min

22. Answer: D. 2 mg/min

1. Convert 2 g to mg = 2,000 mg

2. Use ratio/proportion to solve

x = 120 mg/hr

3. Calculate the minute rate

120 mg/hr ÷ 60 mins/hr = 2 mg/min

23. Answer: D. 15 mg/hr

x = 15 mg/hr

24. Answer: D. 1 ml

10 mg : 2 ml = 5 mg : x ml

10 x = 10

x = 1

25. Answer: D. 2 tablets

1 grain = 60 mg

10 grains = 600 mg

300 mg : 1 tab = 600 mg: x tabs

26. Answer: B. 0.5 ml

1 mg = 1000 mcg

0.5 mg : 2 ml = .125 mg : x ml

27. Answer: A. 1 ml

1gr = 60 mg

1/150 gr – .4 mg

0.4 mg : 1 ml = 0.4 mg : x ml

28. Answer: A. 15 ml/hr

25,000 units : 250 ml = 1,500 units : x ml

*Remember a pump setting is always ml/hour

29. Answer: A. 1.2 mg/hr

50 mg : 250 ml = x mg : 6 ml

30. Answer: A. 125 ml/hr

1,000 ml ÷ 8 hrs

31. Answer: C. 31 gtts/min

125 ml ÷ 60 min x 15 gtts/ml

32. Answer: C. 9:00

33. Answer: C. 100 ml/hr

50 ml : 30 min = x ml : 60 min

34. Answer: C. 167 ml/hr

250 ml : 90 min = x ml : 60 min

35. Answer: D. 0.9 ml

500 mg : 1.8 ml = 250 mg : x ml

36. Answer: D. 14 ml/hr

198 lbs ÷ 2.2 lbs/Kg = 90 Kg

90 Kg x 5 mcg/min = 4500 mg/min

4500 mcg ÷ 1000 mcg/mg = 0.45 mg/min

500 mg : 250 ml = 0.45 mg : x ml

x = .0225 ml/min

.0225 ml/min x 60 min in hr = 13.5 = 14 ml/hr