**NCLEX Drug Dosage Calculation Exam #06 In Text Mode: All questions and answers are given for reading and answering at your own pace.**

Question 1. You have an order for diphenhydramine hydrochloride (Benadryl) 40 mg IM now. You have on hand Benadryl 25 mg/mL. How many milliliters do you prepare?

A). 2.5 mL.

B). 1.6 mL.

C). 2 mL.

D). 1 mL.

**Question 1 Answer: B). 1.6 mL.
Question 1 Explanation: 40 mg x (1 mL/25 mg )= 1.6 mL
**

Question 2. You need to infuse 1000 mL of normal saline IV over 6 hours. How many milliliters per hour do you set on the IV infusion controller?

A). 3 mL/hour.

B). 100 mL/hour.

C). 150 mL/hour.

D). 167 mL/hour.

**Question 2 Answer: D). 167 mL/hour.
Question 2 Explanation: (1000 mL/6 hrs)= 167 mL/hour
**

Question 3. You have an order for 500 mg vancomycin 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 18.4 mg/kg/day.

C). patient is receiving 40.0 mg/kg/day.

D). patient is receiving 9.2 mg/kg/day.

**Question 3 Answer: A). patient is receiving 36.7 mg/kg/day.
Question 3 Explanation: (500 mg/120 lbs ) x (4 doses/ day) x (2.2 lbs /1 kg)= patient is receiving 36.7 mg/kg/day **

*36.7 mg/kg is less than the safe dose of 40 mg/kg, so it is safe.

Question 4. You have digoxin (Lanoxin) 0.25 mg tablets, and you need to administer 0.375 mg PO. How many tablets should you administer?

A). 0.7 tablet.

B). 2 tablets.

C). 1.5 tablets.

D). 1 tablet.

**Question 4 Answer: C). 1.5 tablets.
Question 4 Explanation: 0.375 mg x (1 tablet/0.25 mg )= 1.5 tablets
**

Question 5. A patient is taking acetaminophen (Tylenol) 325 mg, 2 tablets PO every 6 hours. How many grams is the patient receiving in 24 hours?

A). 2 g.

B). 1 g.

C). 1.6 g.

D). 2.6 g.

**Question 5 Answer: D). 2.6 g.
Question 5 Explanation: (325 mg /tablet ) x (2 tablets /dose ) x (4 doses /day) x (1g /1,000mg )= 2.6 g
**

Question 6. You have an order for fosphenytoin (Cerebyx) 100 phenytoin equivalents (PE) IVPB qid. It arrives in 50 mL of normal saline, with a note on the piggyback bag not to infuse faster than 150 PE/minute. How many milliliters per hour should you set on the controller?

A). 4,800 mL/hour maximum rate.

B). 5,250 mL/hour maximum rate.

C). 4,500 mL/hour maximum rate.

D). 5,000 mL/hour maximum rate.

**Question 6 Answer: C). 4,500 mL/hour maximum rate.
Question 6 Explanation: (150 PE/minute) x (50 mL/100 PE) x (60 minutes/1 hr)= 4,500
**

Question 7. Your order reads ceftizoxime 1 g IV piggyback (IVPB) every 8 hours. The pharmacy supplies it in 100 mL D5W. You need to infuse it over 30 minutes. Using gravity drip tubing with a drop factor of 10, how fast will you run the piggyback?

A). 38 gtts/min.

B). 23 gtts/min.

C). 33 gtts/min.

D). 42 gtts/min.

**Question 7 Answer: C). 33 gtts/min.
Question 7 Explanation: (100mL /30 mins) x (10 gtts/mL )= 33 gtts/min
**

Question 8. You need to infuse corticotropin (Acthar) 25 U in 500 mL D5W IV over 8 hours. How many milliliters per hour do you infuse on a controller?

A). 25 mL/hour.

B). 55 mL/hour.

C). 38 mL/hour.

D). 63 mL/hour.

**Question 8 Answer: D). 63 mL/hour.
Question 8 Explanation: (500 mL/8 hrs)= 63 mL/hour
**

Question 9. You have 500 mL of lipids on a second IV infusion controller to piggyback into a primary hyperalimentation line. You want to run the infusion over 24 hours. At what rate should you run the lipids?

A). 24 mL/hour.

B). 21 mL/hour.

C). 35 mL/hour.

D). 33 mL/hour.

**Question 9 Answer: B). 21 mL/hour.
Question 9 Explanation: (500 mL/ 24 hrs)= 21 mL/hour
**

Question 10. You have 350 mL packed red blood cells that you want to infuse IV over 2 hours. There is no controller available. Your blood tubing delivers 10 gtts/mL. How many drops per minute should you set?

A). 33 gtts/minute.

B). 29 gtts/minute.

C). 3 gtts/minute.

D). 18 gtts/minute.

**Question 10 Answer: B). 29 gtts/minute.
Question 10 Explanation: (350 mL / 2 hrs ) x (1 hr /60 mins) x (10 gtts/1 mL )= 29 gtts/minute
**