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ATI RN Dosage Calculations Fundamentals
Total Questions : 25
Showing 25 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.
A nurse is preparing to administer 2 Tbsp of ibuprofen to a client. How many mL should the nurse administer per dose?
Explanation
The nurse should administer 30 mL of ibuprofen per dose. Here’s the calculation: Step 1: The total dosage required is 2 Tbsp.
Step 2: 1 Tbsp is equivalent to 15 mL.
Step 3: So, the volume to be administered is 2 Tbsp × 15 mL/Tbsp = 30 mL.
A nurse is preparing to administer 1g of cefazolin IM. The nurse reconstitutes a 1g vial of cefazolin with sterile water to yield a final concentration of 330 mg/mL. How many mL should the nurse administer?
Explanation
The nurse should administer 3.03 mL of cefazolin. Here’s the calculation: Step 1: The total dosage required is 1g.
Step 2: Each mL of the reconstituted solution contains 330 mg of cefazolin. Step 3: So, the volume to be administered is 1000 mg ÷ 330 mg/mL = 3.03 mL.
A nurse is preparing a label for an amoxicillin oral suspension that was just reconstituted. How many days after reconstitution should the medication be discarded?
Explanation
The medication should be discarded 14 days after reconstitution. This is a standard guideline for most reconstituted medications to ensure potency and prevent bacterial growth.
A nurse is preparing to administer 1,200,000 units of benzathine penicillin G IM. If the available benzathine penicillin G injection is 600,000 units/mL, how many mL should the nurse administer?
Explanation
The nurse should administer 2 mL of benzathine penicillin G. Here’s the calculation: Step 1: The total dosage required is 1,200,000 units.
Step 2: Each mL of the injection contains 600,000 units of benzathine penicillin G.
Step 3: So, the volume to be administered is 1,200,000 units ÷ 600,000 units/mL = 2 mL.
A nurse is preparing to administer 200 mg of phenytoin PO. If the available phenytoin oral suspension is 125 mg/5 mL, how many mL should the nurse administer?
Explanation
The nurse should administer 8 mL of phenytoin. Here’s the calculation: Step 1: The total dosage required is 200 mg.
Step 2: Each 5 mL of the oral suspension contains 125 mg of phenytoin.
Step 3: So, the volume to be administered is (200 mg ÷ 125 mg/5mL) = 8 mL.
A nurse is caring for a client who weighs 128 lb. What is the client's weight in kg?
Explanation
The client’s weight is 58.06 kg. Here’s the calculation: Step 1: The client’s weight is 128 lb. Step 2: 1 lb is equivalent to 0.453592 kg.
Step 3: So, the client’s weight in kg is 128 lb × 0.453592 kg/lb = 58.06 kg.
A nurse is preparing to administer 50 mg of prednisone PO to a client.
If the available prednisone is 20 mg/tablet, how many tablets should the nurse administer?
Explanation
The nurse should administer 2.5 tablets of prednisone. Here’s the calculation: Step 1: The total dosage required is 50 mg.
Step 2: Each tablet contains 20 mg of prednisone.
Step 3: So, the number of tablets required is 50 mg ÷ 20 mg/tablet = 2.5 tablets.
A nurse is obtaining a health history from a new client who has a history of kidney stones. Which statement by the client indicates an increased risk for renal calculi?
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 lb. If the available phenobarbital elixir is 20 mg/5 mL, how many mL should the nurse administer per dose?
Explanation
Step 1: Convert the client’s weight from pounds to kilograms. 1 kg = 2.2 lb, so 44 lb ÷ 2.2 = 20 kg.
Step 2: Calculate the total daily dose of phenobarbital. The doctor ordered 6 mg/kg/day, so 6 mg/kg/day × 20 kg = 120 mg/day.
Step 3: Divide the total daily dose into two equal doses, as it is to be given every 12 hours. So, 120 mg/day ÷ 2 = 60 mg/dose.
Step 4: Calculate the volume of phenobarbital elixir to administer per dose. The available phenobarbital elixir is 20 mg/5 mL, so (60 mg ÷ 20 mg) × 5 mL = 15 mL. The nurse should administer 15 mL of phenobarbital elixir per dose.
A nurse is preparing to administer meperidine 75 mg IM stat.
If the available meperidine injection is 100 mg/mL, how many mL should the nurse administer?
Explanation
Step 1: Calculate the volume of meperidine injection to administer. The available meperidine injection is 100 mg/mL, so 75 mg ÷ 100 mg/mL = 0.75 mL. The nurse should administer 0.75 mL of meperidine injection.
A nurse is preparing to administer tobramycin 4 mg/kg/day IM divided in three equal doses to a client who weighs 60 kg. If the available tobramycin is 40 mg/mL, how many mL should the nurse administer per dose?
Explanation
Step 1: Calculate the total daily dose of tobramycin. The doctor ordered 4 mg/kg/day, so 4 mg/kg/day × 60 kg = 240 mg/day.
Step 2: Divide the total daily dose into three equal doses, as it is to be given in three divided doses. So, 240 mg/day ÷ 3 = 80 mg/dose.
Step 3: Calculate the volume of tobramycin to administer per dose. The available tobramycin is 40 mg/mL, so 80 mg ÷ 40 mg/mL = 2 mL. The nurse should administer 2 mL of tobramycin per dose.
A nurse is preparing to administer lorazepam 0.05 mg/kg IM 2 hr prior to surgery to a client who weighs 138 lb. If the available lorazepam injection is 2 mg/mL, how many mL should the nurse administer? .
Explanation
Step 1: Calculate the dose of lorazepam. The doctor ordered 0.05 mg/kg, so 0.05 mg/kg × 62.73 kg (138 lb ÷ 2.2 lb/kg) = 3.14 mg.
Step 2: Calculate the volume of lorazepam injection to administer. The available lorazepam injection is 2 mg/mL, so 3.14 mg ÷ 2 mg/mL = 1.57 mL. The nurse should administer 1.57 mL of lorazepam injection.
A nurse is preparing to administer lactated Ringer's 250 mL IV to infuse over 15 min.
The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number.
Use a leading zero if it applies.
Do not use a trailing zero.). mL/hr.
Explanation
Step 1 is to calculate the total volume to be infused in mL/hr. This is done by dividing the total volume (250 mL) by the time in hours (15 min ÷ 60 min/hr). So, 250 mL ÷ (15 min ÷ 60 min/hr) = 1000 mL/hr.
So, the correct answer is 1000 mL/hr.
A nurse is preparing to administer cefazolin 1g intermittent IV bolus in 0.9% sodium chloride 250 mL over 30 min.
The drop factor on the manual IV tubing is 10 gtt/mL. The nurse should set the manual IV flow rate to deliver how many gtt/min? (Round the answer to the nearest whole number.
Use a leading zero if it applies.
Do not use a trailing zero.). gtt/min.
Explanation
Step 1 is to calculate the total volume to be infused in mL/min. This is done by dividing the total volume (250 mL) by the time in minutes (30 min). So, 250 mL ÷ 30 min = 8.33 mL/min. Step 2 is to convert mL/min to gtt/min using the drop factor. So, (8.33 mL/min) × (10 gtt/mL) = 83.3 gtt/min. Round off to the nearest whole number, the correct answer is 83 gtt/min.
A nurse is preparing to reconstitute ampicillin for IM administration to a client who has urethritis.
Which of the following information should the nurse interpret from the medication label? (Refer to the medication label below.).
*This vial contains ampicillin sodium equivalent to 1 gram ampicillin.
For IM use, add 3.5 ml diluent (read accompanying insert). Resulting solution contains 250 mg ampicillin per mL. Use solution within 1 hour.
Usage dosage: Adults-250 to 500 mg IM qóh. READ ACCOMPANYING INSERT. T tor.
detailed indications, IM or IV dosage, and precautions.
Store the dry powder at 20° to 25° C (68° to 77° F) (See USP]). NDC 1234-1234-10. Ampicillin for Injection, UŠP. 1 gram per vial. For IM or IV Use.
End of label.
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