ATI Dosage Calculation RN Fundamentals Proctored –
All-New 11 Combined Test Bank & All Versions Exam
Bundle – Updated 2025/2026 NCLEX® Dosage
Calculation Prep
A nurse is preparing to administer codeine 20 mg PO every 6 hr PRN pain. Available is codeine oral
solution 10 mg/ 5 mL. How many mL should the nurse administer per dose?
(Round to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: 10 mL
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 20 mg
Step 3: What is the dose available? Dose available = Have 10 mg
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? 5 mL
Step 6: Set up an equation and solve for X.
Have/Quantity = Desired/X
10 mg/ 5 mL = 20 mg/ X mL
X mL = 10 mL
Step 7: Round if necessary.
Step 8: Determine whether the amount to administer makes sense. If there are 10 mg/5 mL and the
prescription reads 20 mg, it makes sense to administer 10 mL. The nurse should administer codeine oral
solution 10 mL PO every 6 hr PRN pain.
A nurse is preparing to administer phenytoin 200 mg PO. Available is phenytoin oral suspension 125
mg/5 mL. How many mL should the nurse administer?
(Round to nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: mL
,Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 200 mg
Step 3: What is the dose available? Dose available = Have 125 mg
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? 5 mL
Step 6: Set up an equation and solve for X.
Have/Quantity = Desired/X
125 mg/ 5 mL = 200 mg /X mL
X mL = 8 mL
Step 7: Round if necessary.
Step 8: Determine whether the amount to administer makes sense. If there are 125 mg/5 mL and the
prescription reads 200 mg, it makes sense to administer 8 mL. The nurse should administer phenytoin 8
mL PO.
A nurse is caring for a patient who weighs 128 lb. What is the patient's weight in kg?
(Round to nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: 58.2 kg
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? kg
Step 2: Set up an equation and solve for X.
2.2 lb/ 1 kg = Client's weight in lb /X kg
2.2 lb/ 1 kg = 128 lb / X kg
X kg = 58.181818 kg
Step 3: Round if necessary. 58.181818 kg = 58.2 kg
Step 4: Determine whether the weight conversion makes sense. If the client weighs 128 lb and 2.2 lb
equals 1 kg, it makes sense that the client weighs 58.2 kg.
A nurse is reviewing a patient's prescriptions. The nurse should contact the provider to clarify which
of the following prescriptions?
A. Lovastatin 20 mg PO once daily
B. Diltiazem 30 mg PO 3 times/daily; hold for apical pulse rate less than 50/min
C. Hydrochlorothiazide 50 mg twice daily with meals
D. Enoxaparin 30 mg subcutaneous Q12H
C. Hydrochlorothiazide 50 mg twice daily with meals
Explanation: The nurse should contact the provider for clarification of this prescription because it is
missing a route of administration.
A nurse is preparing to administer benzathine penicillin G 1,200,000 units IM. Available is benzathine
penicillin G injection 600,000 units/mL. How many mL should the nurse administer?
, (Round Answer- to nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: 2 mL
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 1,200,000 units
Step 3: What is the dose available? Dose available = Have 600,000 units
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? 1 mL
Step 6: Set up an equation and solve for X.
Have/Quantity = Desired/X
600,000 units / 1 mL = 1,200,000 units / X mL
X mL = 2 mL
Step 7: Round if necessary.
Step 8: Determine whether the amount to administer makes sense. If there are 600,000 units/mL and
the prescription reads 1,200,000 units, it makes sense to administer 2 mL. The nurse should administer
benzathine penicillin G 2 mL IM.
A nurse is preparing to administer codeine 20 mL oral solution to a patient. How many tsp should the
nurse administer?
(Round Answer- to nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: 4 tsp
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? tsp
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 20 mL
Step 3: What is the dose available? Dose available = Have 1 tsp
Step 4: Should the nurse convert the units of measurement? Yes (mL does not equal tsp)
5 mL / 1 tsp = 20 mL / X tsp
X tsp = 4 tsp
Step 5: Round if necessary.
Step 6: Determine whether the amount to administer makes sense. If the prescription reads 20 mL and 5
mL equals 1 tsp, it makes sense to administer 4 tsp. The nurse should administer codeine oral solution 4
tsp PO.
A nurse is reviewing new prescriptions for a patient who was just admitted. For which of the following
prescriptions should the nurse obtain further clarification from the provider?
A. Desvenlafaxine 50 mg PO qd
B. Ketorolac nasal spray 1 spray in each nostril every 6 hours PRN moderate pain
C. Oxycodone 10 mg PO every 4 hours PRN severe pain
D. Regular insulin 35 units subcut 30 min ac
All-New 11 Combined Test Bank & All Versions Exam
Bundle – Updated 2025/2026 NCLEX® Dosage
Calculation Prep
A nurse is preparing to administer codeine 20 mg PO every 6 hr PRN pain. Available is codeine oral
solution 10 mg/ 5 mL. How many mL should the nurse administer per dose?
(Round to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: 10 mL
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 20 mg
Step 3: What is the dose available? Dose available = Have 10 mg
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? 5 mL
Step 6: Set up an equation and solve for X.
Have/Quantity = Desired/X
10 mg/ 5 mL = 20 mg/ X mL
X mL = 10 mL
Step 7: Round if necessary.
Step 8: Determine whether the amount to administer makes sense. If there are 10 mg/5 mL and the
prescription reads 20 mg, it makes sense to administer 10 mL. The nurse should administer codeine oral
solution 10 mL PO every 6 hr PRN pain.
A nurse is preparing to administer phenytoin 200 mg PO. Available is phenytoin oral suspension 125
mg/5 mL. How many mL should the nurse administer?
(Round to nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: mL
,Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 200 mg
Step 3: What is the dose available? Dose available = Have 125 mg
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? 5 mL
Step 6: Set up an equation and solve for X.
Have/Quantity = Desired/X
125 mg/ 5 mL = 200 mg /X mL
X mL = 8 mL
Step 7: Round if necessary.
Step 8: Determine whether the amount to administer makes sense. If there are 125 mg/5 mL and the
prescription reads 200 mg, it makes sense to administer 8 mL. The nurse should administer phenytoin 8
mL PO.
A nurse is caring for a patient who weighs 128 lb. What is the patient's weight in kg?
(Round to nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: 58.2 kg
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? kg
Step 2: Set up an equation and solve for X.
2.2 lb/ 1 kg = Client's weight in lb /X kg
2.2 lb/ 1 kg = 128 lb / X kg
X kg = 58.181818 kg
Step 3: Round if necessary. 58.181818 kg = 58.2 kg
Step 4: Determine whether the weight conversion makes sense. If the client weighs 128 lb and 2.2 lb
equals 1 kg, it makes sense that the client weighs 58.2 kg.
A nurse is reviewing a patient's prescriptions. The nurse should contact the provider to clarify which
of the following prescriptions?
A. Lovastatin 20 mg PO once daily
B. Diltiazem 30 mg PO 3 times/daily; hold for apical pulse rate less than 50/min
C. Hydrochlorothiazide 50 mg twice daily with meals
D. Enoxaparin 30 mg subcutaneous Q12H
C. Hydrochlorothiazide 50 mg twice daily with meals
Explanation: The nurse should contact the provider for clarification of this prescription because it is
missing a route of administration.
A nurse is preparing to administer benzathine penicillin G 1,200,000 units IM. Available is benzathine
penicillin G injection 600,000 units/mL. How many mL should the nurse administer?
, (Round Answer- to nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: 2 mL
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 1,200,000 units
Step 3: What is the dose available? Dose available = Have 600,000 units
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? 1 mL
Step 6: Set up an equation and solve for X.
Have/Quantity = Desired/X
600,000 units / 1 mL = 1,200,000 units / X mL
X mL = 2 mL
Step 7: Round if necessary.
Step 8: Determine whether the amount to administer makes sense. If there are 600,000 units/mL and
the prescription reads 1,200,000 units, it makes sense to administer 2 mL. The nurse should administer
benzathine penicillin G 2 mL IM.
A nurse is preparing to administer codeine 20 mL oral solution to a patient. How many tsp should the
nurse administer?
(Round Answer- to nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer-: 4 tsp
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? tsp
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 20 mL
Step 3: What is the dose available? Dose available = Have 1 tsp
Step 4: Should the nurse convert the units of measurement? Yes (mL does not equal tsp)
5 mL / 1 tsp = 20 mL / X tsp
X tsp = 4 tsp
Step 5: Round if necessary.
Step 6: Determine whether the amount to administer makes sense. If the prescription reads 20 mL and 5
mL equals 1 tsp, it makes sense to administer 4 tsp. The nurse should administer codeine oral solution 4
tsp PO.
A nurse is reviewing new prescriptions for a patient who was just admitted. For which of the following
prescriptions should the nurse obtain further clarification from the provider?
A. Desvenlafaxine 50 mg PO qd
B. Ketorolac nasal spray 1 spray in each nostril every 6 hours PRN moderate pain
C. Oxycodone 10 mg PO every 4 hours PRN severe pain
D. Regular insulin 35 units subcut 30 min ac
