Question

A nurse is preparing to administer phenytoin oral suspension. Which of the following information should the nurse identify as correct, according to the medication label? (Refer to the medication label below to answer the question.)

Answer 1

Correct Answers:

Shake the bottle well before each use.

Rationale :

🔹 Phenytoin oral suspension is a suspension, meaning the medication is not evenly dissolved and particles may settle over time. To ensure accurate dosing, shaking the bottle well before each use is essential to evenly distribute the medication.

🔹 Most oral suspensions must be shaken to avoid administering a subtherapeutic or toxic dose due to uneven distribution.

🔹 Storage in a refrigerator is not recommended for phenytoin; it should be kept at room temperature to avoid precipitation or changes in viscosity.

🔹 While phenytoin is often available as 125 mg/5 mL, a strength of 125 mg/mL is extremely high and incorrect for routine use.

🔹 The total volume of the bottle (e.g., 250 mL) is not the key safety instruction for administration, unlike shaking the suspension.

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Answer 2

Correct Answers:

0.63

Rationale :

➗ Step 1: Identify the prescribed dose and available concentration

✴️ Ordered: 125 mg

✴️ Available: 200 mg/mL

➗ Step 2: Use the formula

📌 mL = Dose ordered ÷ Dose available per mL

📌 mL = 125 mg ÷ 200 mg/mL

💥 mL = 0.625 → Rounded to the nearest hundredth = 0.63 mL

🔵 Final Answer: 0.63 mL

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Answer 3

Correct Answers:

Place the medication under the tongue.

Rationale :

🔹 Sublingual (SL) nitroglycerin is designed to be absorbed directly through the mucous membranes under the tongue, allowing for rapid onset of action to relieve acute chest pain (angina).

🔹 The client should not swallow, chew, or take the medication with food or water, as these actions would interfere with sublingual absorption and reduce the medication’s effectiveness.

🔹 Nitroglycerin should dissolve completely under the tongue without being chewed to ensure maximum therapeutic benefit.

🔹 It is important the client sits or lies down while taking the medication due to the risk of orthostatic hypotension or dizziness.

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Answer 4

Correct Answers:

1800

Rationale :

🧮 Step-by-step Calculation:

✴️ Step 1: Convert weight from pounds to kilograms

📌 264 lb ÷ 2.2 = 120 kg

✴️ Step 2: Multiply weight by dose

📌 15 mg × 120 kg = 1,800 mg

✅ Final Answer: 1,800 mg

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Answer 5

Correct Answers:

1

Rationale :

🧮 Step-by-step Calculation:

✴️ Step 1: Convert weight from pounds to kilograms

📌 146.7 lb ÷ 2.2 = 66.68 kg

✴️ Step 2: Calculate total dose

📌 7.5 mg × 66.68 kg = 500.1 mg

✴️ Step 3: Determine number of tablets

📌 500.1 mg ÷ 500 mg/tablet = 1.0002 tablets

✅ Final Answer: 1 tablet (rounded to the nearest whole number)

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Answer 6

Correct Answers:

3

Rationale :

✴️ Step 1: Convert grams to milligrams

📌 3.9 g × 1,000 = 3,900 mg daily

✴️ Step 2: Divide total daily dose into 2 equal doses (every 12 hr)

📌 3,900 mg ÷ 2 = 1,950 mg per dose

✴️ Step 3: Determine number of tablets per dose

📌 1,950 mg ÷ 650 mg/tablet = 3 tablets

✅ Final Answer: 3 tablets

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Answer 7

Correct Answers:

2

Rationale :

🧮 Step-by-step Calculation:

✴️ Step 1: Determine the mL needed for 400 mg

📌 400 mg ÷ 200 mg = 2 doses

📌 2 × 5 mL = 10 mL

✴️ Step 2: Convert mL to teaspoons

📌 10 mL ÷ 5 mL/tsp = 2 tsp

✅ Final Answer: 2 tsp

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Answer 8

Correct Answers:

0.25

Rationale :

🧮 Step-by-step Calculation:

✴️ Step 1: Use the formula

📌 mL = Dose ordered ÷ Dose available per mL

✴️ Step 2: Plug in values

📌 11 mcg ÷ 22 mcg = 0.5

📌 0.5 × 0.5 mL = 0.25 mL

✅ Final Answer: 0.25 mL

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Answer 9

Correct Answers:

18

Rationale :

🧮 Step-by-step Calculation:

✴️ Step 1: Convert weight to kg

📌 154 lb ÷ 2.2 = 70 kg

✴️ Step 2: Calculate dose in mg

📌 1 mg × 70 kg = 70 mg

✴️ Step 3: Calculate mL to administer

📌 70 mg ÷ 40 mg/mL = 1.75 mL → Rounded to 1.8 mL

✅ Final Answer: 1.8 mL

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Answer 10

Correct Answers:

0.8

Rationale :

🧮 Step-by-step Calculation:

✴️ Step 1: Convert weight to kg

📌 68 lb ÷ 2.2 = 30.91 kg

✴️ Step 2: Calculate dose in mg

📌 1.25 mg × 30.91 kg = 38.64 mg

✴️ Step 3: Calculate mL to administer

📌 38.64 mg ÷ 50 mg/mL = 0.7728 mL → Rounded to 0.8 mL

✅ Final Answer: 0.8 mL

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PN Dose Calculation-2025

No.

1 :
A nurse is preparing to administer phenytoin oral suspension. Which of the following information should the nurse identify as correct, according to the medication label? (Refer to the medication label below to answer the question.)

3 :
A nurse is reviewing a client's new prescription for nitroglycerin 0.4 mg SL every 3 to 5 min PRN for chest pain. The nurse should instruct the client to do which of the following?

4 :
A nurse is preparing to administer phenytoin 15 mg/kg PO as a loading dose to a client who weighs 264 lb. How many mg should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

5 :
A nurse is preparing to administer metronidazole 7.5 mg/kg PO to a client who weighs 146.7 lb. Available is metronidazole 500 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

9 :
A nurse is preparing to administer gentamicin 1 mg/kg 1M to a client who weighs 154 lb. Available is gentamicin solution 40 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. DO not use a trailing zero.)

10 :
A nurse is preparing to administer diphenhydramine 1.25 mg/kg 1M to a child who weighs 68 lb. Available is diphenhydramine injection 50 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

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PN Dose Calculation-2025

No.

1 : A nurse is preparing to administer phenytoin oral suspension. Which of the following information should the nurse identify as correct, according to the medication label? (Refer to the medication label below to answer the question.)

3 : A nurse is reviewing a client's new prescription for nitroglycerin 0.4 mg SL every 3 to 5 min PRN for chest pain. The nurse should instruct the client to do which of the following?

4 : A nurse is preparing to administer phenytoin 15 mg/kg PO as a loading dose to a client who weighs 264 lb. How many mg should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

5 : A nurse is preparing to administer metronidazole 7.5 mg/kg PO to a client who weighs 146.7 lb. Available is metronidazole 500 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

9 : A nurse is preparing to administer gentamicin 1 mg/kg 1M to a client who weighs 154 lb. Available is gentamicin solution 40 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. DO not use a trailing zero.)

10 : A nurse is preparing to administer diphenhydramine 1.25 mg/kg 1M to a child who weighs 68 lb. Available is diphenhydramine injection 50 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

1 :
A nurse is preparing to administer phenytoin oral suspension. Which of the following information should the nurse identify as correct, according to the medication label? (Refer to the medication label below to answer the question.)

3 :
A nurse is reviewing a client's new prescription for nitroglycerin 0.4 mg SL every 3 to 5 min PRN for chest pain. The nurse should instruct the client to do which of the following?

4 :
A nurse is preparing to administer phenytoin 15 mg/kg PO as a loading dose to a client who weighs 264 lb. How many mg should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

5 :
A nurse is preparing to administer metronidazole 7.5 mg/kg PO to a client who weighs 146.7 lb. Available is metronidazole 500 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

9 :
A nurse is preparing to administer gentamicin 1 mg/kg 1M to a client who weighs 154 lb. Available is gentamicin solution 40 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. DO not use a trailing zero.)

10 :
A nurse is preparing to administer diphenhydramine 1.25 mg/kg 1M to a child who weighs 68 lb. Available is diphenhydramine injection 50 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)