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A nurse is preparing to administer chlorpromazine 0.55 mg/kg IM every 6 hr to a child who weighs 44 lb. Available is chlorpromazine 25 mg/mL injection. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Answer and Explanation

The Correct Answer is ["0.4 "]

Given:

  • Desired dose of chlorpromazine: 0.55 mg/kg every 6 hours
  • Child's weight: 44 lb
  • Available strength of chlorpromazine injection: 25 mg/mL

First, convert the child's weight from pounds to kilograms:

44 lb ÷ 2.20462 = 20 kg

Now, let's calculate the desired dose of chlorpromazine:

Desired dose = Dosage per kg × Weight Desired dose = 0.55 mg/kg × 20 kg Desired dose = 11 mg

Now, let's find out how many milliliters of chlorpromazine correspond to this dose: Volume (mL) = Desired dose / Concentration

Volume (mL) = 11 mg / 25 mg/mL Volume (mL) ≈ 0.44 mL

So, the nurse should administer approximately 0.4 mL of chlorpromazine per dose.


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Related Questions

Correct Answer is D

Explanation

A. The total volume of the oral suspension is not documented on the drug.

B. The medication is to be stored at temperatures of 20 to 25 degree Celsius. The instructions also state that the drug is not to be frozen. These don’t require refrigeration.
C. The drug contains 125mg/ 5ml and not for every ml.

D. It has been clearly indicated on the drug that it is to be shaken well before use.

Correct Answer is ["2"]

Explanation

Given:

  • Desired dose of ibuprofen: 200 mg
  • Available strength of ibuprofen oral suspension: 100 mg/5 mL

First, find out the concentration of ibuprofen in mg/mL:

Concentration = 100 mg / 5 mL Concentration = 20 mg/mL

Now, calculate how many milliliters (mL) of ibuprofen oral suspension are needed to achieve the desired dose:

Volume (mL) = Desired dose / Concentration Volume (mL) = 200 mg / 20 mg/mL

Volume (mL) = 10 mL

Since 1 teaspoon (tsp) is approximately 5 milliliters (mL), the nurse should instruct the client to take:

Number of teaspoons = Volume (mL) / 5 mL per tsp Number of teaspoons = 10 mL / 5 mL per tsp Number of teaspoons = 2 tsp

So, the nurse should instruct the client to take 2 teaspoons of ibuprofen oral suspension.

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