ATI LPN
ATI LPN Pharmacology Exam Questions
Extract:
Question 1 of 5
A nurse is preparing to administer phenobarbital 6 mg/kg/day PO divided in equal doses every 12 hr to a client who weighs 44 lbs. Available is phenobarbital elixir 20 mg/5ml. The nurse should administer how many mL per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use trailing zeros.
Correct Answer: B
Rationale: Weight = 44 lb × 0.453592 = 19.96 kg. Daily dose = 6 mg/kg/day × 19.96 kg = 119.76 mg. Per dose = 119.76 / 2 = 59.88 mg. Volume = 59.88 × (5 mL / 20 mg) = 14.97 mL, rounded to 15 mL.
Question 2 of 5
The patient is receiving nitroglycerin 55 mcg/min. Available: Nitroglycerin in 5% Dextrose Injection 25 mg per 250 mL (100 mcg/mL) What is the flow rate?
Correct Answer: D
Rationale: Dose = 55 mcg/min × 60 = 3300 mcg/hr. Flow rate = 3300 mcg/hr / 100 mcg/mL = 33 mL/hr.
Question 3 of 5
A nurse is preparing to administer dopamine 3mcg/kg/min by continuous IV infusion to a preschooler who weighs 41.8 bs. Available is dopamine 400 mg in dextrose 596 in water (D5W) 250 mL. The nurse should set the IV pump to deliver how many ml/hr? (Round to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Correct Answer: A
Rationale: Weight = 41.8 lb × 0.453592 = 18.96 kg. Dose = 3 mcg/kg/min × 18.96 kg × 60 = 3412.8 mcg/hr. Concentration = 400 mg / 250 mL = 1.6 mg/mL = 1600 mcg/mL. Flow rate = 3412.8 / 1600 = 2.13 mL/hr, rounded to 2.1 mL/hr.
Question 4 of 5
Calculate the dosage using the label below. Round to the nearest tenth place. Order: Celestone, Soluspan (betamethasone) 12 mg IM q24 hr. for 2 doses. Available
Correct Answer: D
Rationale: Concentration = 6 mg/mL. Volume = 12 mg / 6 mg/mL = 2 mL IM.
Question 5 of 5
What factors affect physiological response to drug use?
Correct Answer: A
Rationale: Age, weight, and sex directly influence drug absorption, metabolism, and excretion.