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A nurse is preparing to administer amoxicillin 30 mg/kg/day divided doses every 12 hr to a toddler who weighs 33 lb. Available is amoxicillin 200 mg/5 mL suspension. How many mL should the nurse administer every 12 hr? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

A.

5 mL

B.

5.6 mL

C.

0.5 mL

D.

6 mL

Answer and Explanation

The Correct Answer is B

Given:

Ordered dose of amoxicillin: 30 mg/kg/day divided every 12 hours

Toddler's weight: 33 lbs

Concentration of amoxicillin suspension: 200 mg/5 mL

 

Step 1: Convert the toddler's weight from pounds to kilograms:

1 pound (lb) = 0.453592 kilograms (kg)

Weight in kg = 33 lbs x 0.453592 kg/lb = 14.968 kg

Step 2: Calculate the total daily dose of amoxicillin:

Total daily dose (mg) = Ordered dose (mg/kg/day) x Weight (kg)

Total daily dose (mg) = 30 mg/kg/day x 14.968 kg

Total daily dose (mg) = 449.04 mg/day

Step 3: Calculate the dose per administration:

Since the medication is given every 12 hours, there are 2 administrations per day.

Dose per administration (mg) = Total daily dose (mg) / Number of administrations per day

Dose per administration (mg) = 449.04 mg/day / 2 administrations/day

Dose per administration (mg) = 224.52 mg

Step 4: Calculate the volume to be administered:

Volume (mL) = Dose per administration (mg) / Concentration (mg/mL)

Volume (mL) = 224.52 mg / (200 mg/5 mL)

Volume (mL) = 224.52 mg x (5 mL / 200 mg)

Volume (mL) = 5.613 mL

Step 5: Round to the nearest tenth:

Volume (mL) ≈ 5.6 mL


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Related Questions

Correct Answer is B

Explanation

Given:

Volume of fluid: 100 mL

Infusion time: 4 hours

Drop factor: 60 gtt/mL

Formula:

Flow rate (gtt/min) = (Volume (mL) / Time (hr)) x Drop factor (gtt/mL) / 60 min/hr

Step 1: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Volume (mL) / Time (hr)

Infusion rate (mL/hr) = 100 mL / 4 hr

Infusion rate (mL/hr) = 25 mL/hr

Step 2: Calculate the flow rate in gtt/min:

Flow rate (gtt/min) = (Infusion rate (mL/hr) x Drop factor (gtt/mL)) / 60 min/hr

Flow rate (gtt/min) = (25 mL/hr x 60 gtt/mL) / 60 min/hr

Flow rate (gtt/min) = 1500 gtt/hr / 60 min/hr

Flow rate (gtt/min) = 25 gtt/min

Correct Answer is A

Explanation

Convert the dosage to mcg per hour:

15mcg/min×60min/hr=900mcg/hr15

Convert the available nitroglycerin concentration to mcg/mL:

25mg=25,000mcg

Theconcentrationis(25,000mcg/250mL)=100mcg

Calculate the flow rate in mL per hour using the dosage and concentration:

Flowrate(mL/hr)=(900mcg/hr100mcg/mL)=9mL/hr

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