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ATI RN Dosage Calculations Fundamentals
Total Questions : 25
Showing 10 questions, Sign in for moreA nurse is planning to instruct a caregiver on the use of phenytoin oral suspension. What information should the nurse include in the instruction?
A nurse is set to administer 3 mg of haloperidol lactate IM to a patient.
Given that the available haloperidol injection is 5 mg/mL, how many mL should the nurse administer?
Explanation
Step 1 is to calculate the volume of haloperidol to administer. Given that the available haloperidol injection is 5 mg/mL and the nurse needs to administer 3 mg, the calculation is as follows: 3 mg ÷ 5 mg/mL = 0.6 mL
A nurse is preparing to administer phenytoin 100 mg PO every 8 hours.
If the available phenytoin suspension is 125 mg/5 mL, how many mL should the nurse administer per dose?
Explanation
Step 1 is to calculate the volume of phenytoin to administer. Given that the available phenytoin suspension is 125 mg/5 mL and the nurse needs to administer 100 mg, the calculation is as follows: 100 mg ÷ (125 mg/5 mL) = 4 mL
A nurse is preparing to administer cefaclor 500 mg PO every 12 hours.
If the available cefaclor oral suspension is 250 mg/5 mL, how many mL should the nurse administer per dose?
Explanation
Step 1: We need to find out how many mL of cefaclor oral suspension the nurse should administer per dose.
Given:
The doctor’s order is 500 mg of cefaclor.
The available cefaclor oral suspension is 250 mg/5 mL.
Step 2: We set up a proportion to find out the volume of the oral suspension that contains 500 mg of cefaclor.
Let’s denote the volume we are looking for as X mL. So, we have:
250 mg : 5 mL = 500 mg : X mL
Step 3: We cross-multiply and solve for X. 250 mg × X mL = 500 mg × 5 mL
Step 4: We divide both sides by 250 mg. X mL = (500 mg × 5 mL) ÷ 250 mg
Step 5: We calculate X.
X = (500 mg × 5 mL) ÷ 250 mg = 10 mL
So, the nurse should administer 10 mL of the cefaclor oral suspension per dose.
A nurse is reviewing new prescriptions for a newly admitted patient.
Which of the following prescriptions should the nurse seek further clarification from the provider?
A nurse is preparing to administer midazolam 0.07 mg/kg IM to a patient who weighs 50 kg. If the available midazolam is 5 mg/mL, how many mL should the nurse administer?
Explanation
Step 1 is to calculate the volume of midazolam to administer. Given that the available midazolam is 5 mg/mL and the nurse needs to administer 0.07 mg/kg to a patient who weighs 50 kg, the calculation is as follows: (0.07 mg/kg × 50 kg) ÷ 5 mg/mL = 0.7 mL3
A nurse is preparing to administer codeine 20 mg PO every 6 hours as needed for pain.
If the available codeine oral solution is 10 mg/5 mL, how many mL should the nurse administer per dose?
Explanation
Step 1 is to calculate the volume of codeine to administer. Given that the available codeine oral solution is 10 mg/5 mL and the nurse needs to administer 20 mg, the calculation is as follows: 20 mg ÷ (10 mg/5 mL) = 10 mL4
A nurse is set to administer 4 mg of morphine IM. If the available morphine injection is 10 mg/mL, how many mL should the nurse administer per dose? .
Explanation
Step 1 is to calculate the volume of morphine to administer. Given that the available morphine injection is 10 mg/mL and the nurse needs to administer 4 mg, the calculation is as follows: 4 mg ÷ 10 mg/mL = 0.4 mL
A nurse is preparing to administer 40 mg of famotidine PO at bedtime.
If the available famotidine is 20 mg/tablet, how many tablets should the nurse administer?
Explanation
The nurse should administer 2 tablets of famotidine. Here’s the calculation: Step 1: The total dosage required is 40 mg.
Step 2: Each tablet contains 20 mg of famotidine.
Step 3: So, the number of tablets required is 40 mg ÷ 20 mg/tablet = 2 tablets.
A nurse is set to administer 4 mg of morphine IM. If the available morphine injection is 10 mg/mL, how many mL should the nurse administer per dose?
Explanation
The nurse should administer 0.4 mL of morphine per dose. Here’s the calculation: Step 1: The total dosage required is 4 mg.
Step 2: Each mL of the injection contains 10 mg of morphine.
Step 3: So, the volume to be administered is 4 mg ÷ 10 mg/mL = 0.4 mL.
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