A nurse is preparing to administer ampicillin 500 mg IM every 6 hr. The available ampicillin is in a 500 mg vial.
The package insert instructs to add 1.8 mL of sterile water to yield ampicillin 250 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number.
Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["2"]
Step 1: The available ampicillin is in a 500 mg vial. The package insert instructs to add 1.8 mL of sterile water to yield ampicillin 250 mg/mL.
Step 2: We need to administer 500 mg of ampicillin. Step 3: The concentration of the solution is 250 mg/mL.
Step 4: To find out how many mL should the nurse administer per dose, we divide the required dose by the concentration.
Step 5: So, 500 mg ÷ 250 mg/mL = 2 mL. The nurse should administer 2 mL per dose.
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Related Questions
Correct Answer is ["8"]
Explanation
Step 1: Convert the client’s weight to kg: 136 lb = 61.69 kg (approx) Step 2: Calculate the total dose: 10 mg/kg × 61.69 kg = 616.9 mg Step 3: Divide the total dose by the available strength:
616.9 mg ÷ 80 mg/mL = 7.71 mL Step 4: Round to the nearest whole number: 8 mL So, the nurse should administer 8 mL.
Correct Answer is ["750"]
Explanation
Step 1: Convert 12L of lactated Ringers to mL. We know that 1L = 1000mL. So, 12L of lactated Ringers is 12000mL.
Step 2: Calculate the volume of fluid to be administered in the first 8 hours. We are told that half of the fluid is to be administered in the first 8 hours. So, the volume to be administered in the first 8 hours is 12000mL ÷ 2 = 6000mL.
Step 3: Calculate the flow rate for the first 8 hours. The flow rate is calculated by dividing the volume to be administered by the time for the infusion. So, the flow rate is 6000mL ÷ 8hr.
Step 4: Round the answer to the nearest whole number. The calculated flow rate is 750 mL/hr. When rounded to the nearest whole number, the flow rate is 750 mL/hr.
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