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Medication Administration and Dosage Calculations > Pharmacology

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Total Questions : 10

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Question 1:

A nurse is preparing to administer a medication with a recommended dose of 5 mg/kg. The client weighs 70 kg. How many mg of the medication should the nurse administer?

A. 350 mg B. 300 mg C. 250 mg D. 200 mg

Answer and Explanation

Choice A:

To calculate the dose of a medication based on the client’s weight, the nurse should multiply the recommended dose by the client’s weight in kg. In this case, the recommended dose is 5 mg/kg and the client weighs 70 kg, so the nurse should administer 5 mg/kg x 70 kg = 350 mg of the medication.

Choice B:

The correct dose is 350 mg, not 300 mg.

Choice C:

The correct dose is 350 mg, not 250 mg.

Choice D:

The correct dose is 350 mg, not 200 mg.

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Question 2:

A nurse is preparing to administer a liquid medication with a concentration of 250 mg/5 mL. The prescribed dose is 500 mg. How many mL of the medication should the nurse administer?

A. 5 mL B. 10 mL C. 15 mL D. 20 mL

Answer and Explanation

Choice A:

The correct volume is 10 mL, not 5 mL.

Choice B:

To calculate the volume of a liquid medication to administer based on its concentration and the prescribed dose, the nurse should divide the prescribed dose by the concentration and multiply by the volume in which the concentration is expressed. In this case, the concentration is 250 mg/5 mL and the prescribed dose is 500 mg, so the nurse should administer (500 mg / 250 mg) x 5 mL = 10 mL of the medication.

Choice C:

The correct volume is 10 mL, not 15 mL.

Choice D:

The correct volume is 10 mL, not 20 mL.

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Question 3:

A nurse has prepared an injection for a patient.What should be done before administering this injection?

A. Verify patient’s identity B. Check injection site C. Check patient’s allergies D. All of above

Answer and Explanation

Choice A:

Verifying patient’s identity using two identifiers such as name and date of birth is important before administering an injection.
b.Checking injection site for any signs of infection,inflammation or injury is important before administering an injection.

Choice B:

Before administering an injection,the nurse should verify patient’s identity using two identifiers such as name and date of birth.The nurse should also check injection site for any signs of infection,inflammation or injury.Finally,the nurse should check patient’s allergies to ensure that they are not allergic to any component of injection being administered.

Choice C:

Checking patient’s allergies to ensure that they are not allergic to any component of injection being administered is important before administering an injection.

Choice D:

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Question 4:

A nurse has prepared an oral tablet for a patient who has difficulty swallowing.What should be done before administering this tablet?

A. Crush tablet and mix with applesauce B. Cut tablet in half C. Administer tablet with large glass of water D. Consult with provider

Answer and Explanation

Choice A:

Crushing tablet and mixing with applesauce may alter pharmacokinetics and should only be done if approved by provider.

Choice B:

Cutting tablet in half may alter pharmacokinetics and should only be done if approved by provider.

Choice C:

Administering tablet with large glass of water may help patient swallow but does not address underlying difficulty.

Choice D:

Before administering an oral tablet to a patient who has difficulty swallowing,the nurse should consult with provider.Some tablets are designed to be swallowed whole and should not be crushed or cut as this may alter their pharmacokinetics.In such cases, alternative formulations such as liquid or chewable tablets may be available.

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Question 5:

A nurse needs to administer an IV infusion at a rate of125mL/hr.How many drops per minute should be delivered if drop factor of tubing set is15gtt/mL?

A. 31gtt/min B. 32gtt/min C. 33gtt/min D. 34gtt/min

Answer and Explanation

Choice A:

To calculate drops per minute,the nurse should multiply infusion rate in mL/hr by drop factor in gtt/mL and divide by60min/hr.In this case,the infusion rate is125mL/hr and drop factor is15gtt/mL so,the nurse should deliver(125mL/hrx15gtt/mL)/60min/hr=31gtt/min.

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Question 6:

A client has been prescribed an oral suspension with a concentration of250mg/5mL.The prescribed dose for client’s weight and condition is750mg.How many teaspoons (tsp)of suspension should be administered?

A. 3tsp B. 4tsp C. 5tsp D. 6tsp

Answer and Explanation

Choice A:

To calculate volume of liquid medication to administer based on its concentration and prescribed dose,the nurse should divide prescribed dose by concentration and multiply by volume in which concentration is expressed.In this case,the concentration is250mg/5mL and prescribed dose is750mg so,the nurse should administer(750mg/250mg)x5mL=15mL of medication.Since 1tsp is equivalent to5mL,the nurse should administer15mL/5mL/tsp=3tsp of medication.

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Question 7:

A nurse needs to administer an IV infusion at a rate of1000mL over8hours. How many mL/hr should be delivered?

A. 100mL/hr B. 125mL/hr C. 150mL/hr D. 175mL/hr

Answer and Explanation

Choice B:

To calculate the infusion rate in mL/hr,the nurse should divide total volume in mL by total infusion time in hours.In this case,the total volume is 1000mL and total infusion time is hours so,the nurse should deliver 1000mL/8hr=125mL/hr.

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Question 8:

A client has been prescribed a medication with a recommended dose of2mg/kg.The client weighs 60kg.How many mg of medication should be administered?

A. 100mg B. 120mg C. 140mg D. 160mg

Answer and Explanation

Choice B:

To calculate the dose of a medication based on client’s weight,the nurse should multiply recommended dose by client’s weight in kg.In this case,the recommended dose is2mg/kg and client weighs 60kg so,the nurse should administer2mg/kg x60kg=120mg of medication.

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Question 9:

A nurse needs to administer an IV infusion at a rate of2000mL over12hours.How many mL/hr should be delivered?

A. 150mL/hr B. 166mL/hr C. 175mL/hr D. 200mL/hr

Answer and Explanation

Choice B:

To calculate infusion rate in mL/hr,the nurse should divide total volume in mL by total infusion time in hours.In this case,the total volume is2000mL and total infusion time is12hours so,the nurse should deliver2000mL/12hr=166mL/hr.

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Question 10:

A nurse needs to administer an IV push medication over3minutes.The total volume to be administered is6mL.How many mL/min should be delivered?

A. 1ml/min B. 2ml/min C. 3ml/min D. 4ml/min

Answer and Explanation

Choice B:

To calculate infusion rate in mL/min,the nurse should divide total volume in mL by total infusion time in minutes.In this case,the total volume is6ml and total infusion time is3minutes so,the nurse should deliver6ml/3min=2ml/min.

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