**NCLEX Drug Dosage Calculation Exam #03 In Text Mode: All questions and answers are given for reading and answering at your own pace.**

Question 1. You need to administer furosemide (Lasix) 2 mg/minute via continuous IV infusion on a controller. Pharmacy has sent a bag of Lasix 400 mg diluted in D5W 250 mL. How many milliliters per hour will you set on the controller?

A). 100 mL/hour.

B). 75 mL/hour.

C). 250 mL/hour.

D). 150 mL/hour.

**Question 1 Answer: B). 75 mL/hour.
Question 1 Explanation: (2mg /minute ) x (250 mL/400 mg ) x (60 minutes / 1 hour)= 75 mL/hour
**

Question 2. You are caring for your ill grandmother at home. She has an order for magnesium hydroxide/aluminum hydroxide (Maalox) 10 mL PO prn stomach upset. How do you instruct her to measure her dose using household measuring spoons?

A). 2 1/2 teaspoons.

B). 1 1/2 teaspoons.

C). 1 teaspoon.

D). 2 teaspoons.

**Question 2 Answer: D). 2 teaspoons.
Question 2 Explanation: 10 mL x (1 tsp/5mL ) = 2 teaspoons
**

Question 3. The physician orders alprazolam (Xanax) 0.5 mg PO. You have on hand Xanax 0.25 mg tablets. How many will you give?

A). 2 tablets.

B). 1 1/2 tablets.

C). 1/2 tablet.

D). 1 tablet.

**Question 3 Answer: A). 2 tablets.
Question 3 Explanation: 0.5 mg x (1 tablet/ 0.25 mg ) = 2 tablets
**

Question 4. You have on hand penicillin 300,000 units/mL. Your order reads penicillin 1,000,000 units IM. How will you fill the syringe?

A). 3.3 mL.

B). 5.5 mL.

C). 0.3 mL.

D). 4.4 mL.

**Question 4 Answer: A). 3.3 mL.
Question 4 Explanation: 1,000,000 units x (1 mL/ 300,000 units ) = 3.3 mL
**

Question 5. Your patient needs 2,000 mL of D5W IV over 24 hours, to be delivered with a tubing set with a drop factor of 15. How many drops per minute will you set for an infusion rate?

A). 21 gtts/minute.

B). 42 gtts/minute.

C). 83 gtts/minute.

D). 36 gtts/minute.

**Question 5 Answer: A). 21 gtts/minute.
Question 5 Explanation: (2,000 mL /24 hours ) x (1 hour /60 minutes) x 15 gtts/mL = 21 gtts/minute
**

Question 6. Your patient is taking acetaminophen (Tylenol) gr 15 every 6 hours PO for headache pain. You know the maximum safe dose is 4 g in 24 hours. Is the dose safe?

A). 6 g/day, not safe!.

B). 8 g/day, not safe!.

C). 4 g/day, safe!.

D). 2 g/day, safe!.

**Question 6 Answer: C). 4 g/day, safe!.
Question 6 Explanation: (15 gr /dose ) x (4 doses /day) x (1g/15 gr ) = 4 g/day. *The dose is at the upper limit of a safe dose.
**

Question 7. A patient with HIV infection is receiving 200 mg of didanosine PO bid. The pharmacy only has powder packets with 167 mg each, to be mixed with 4 oz of water. How many packets should the patient mix? How much should the patient take? How can it be measured?

A). 4.8 oz.

B). 1.8 oz.

C). 2.2 oz.

D). 3.3 oz.

**Question 7 Answer: A). 4.8 oz.
Question 7 Explanation: 200 mg x (4 oz / 167 mg ) = 4.8 oz **

*The patient will have to mix two packets, each in 4 oz of water, and drink 4.8 oz measured in a calibrated measuring cup. If a cup that measures milliliters is available, then:

4.8 oz x (30 mL/1 oz )= 144 mL or 144 mL x (1 tbsp/15 mL )= 9.6 tbsp.

Question 8. Your patient needs 2,000 mL of saline IV over 4 hours for severely deficient fluid volume. How many milliliters per hour will you set on a controller?

A). 8 mL/hour.

B). 33 mL/hour.

C). 250 mL/hour.

D). 500 mL/hour.

**Question 8 Answer: D). 500 mL/hour.
Question 8 Explanation: (2,000 mL/ 4 hours) = 500 mL/ hour
**

Question 9. You need to administer 400 mg of erythromycin PO. You have on hand a suspension of 125 mg/5 mL. How much will you prepare?

A). 1.6 mL.

B). 3.2 mL.

C). 12 mL.

D). 16 mL.

**Question 9 Answer: D). 16 mL.
Question 9 Explanation: 400mg x (5 mL/125mg ) = 16 mL
**

Question 10. You need to administer 250 mg of erythromycin PO. You have on hand 0.5 g tablets. How many tablets will you give?

A). 1 tablet.

B). 1/2 tablet.

C). 2 tablets.

D). 1 1/2 tablets.

**Question 10 Answer: B). 1/2 tablet.
Question 10 Explanation: 250 mg x (1g /1,000mg ) x (1 tablet/ 0.5 g ) = 1/2 tablet
**