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Dosage Calculation

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Total Questions : 56

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Question 1:

Fosamax (alendronate sodium) 60 mg by mouth is ordered. Fosamax 70 mg/75 mL is available. How many milliliters should the nurse administer to the patient?

Round to the nearest whole number.

A. 56 mL B. 64 mL C. 65 mL D. 88 mL

Answer and Explanation

Choice A:

Reason: To determine if 56 mL is correct, we need to calculate the dosage. The ordered dose is 60 mg, and the available concentration is 70 mg in 75 mL. Using the ratio: 60 mg ÷ 70 mg = 0.8571 0.8571 × 75 mL = 64.2857 mL Rounding 64.2857 mL to the nearest whole number gives us 64 mL, not 56 mL. Therefore, 56 mL is incorrect.

Choice B:

Reason: This choice is correct. The calculation is as follows: 60 mg ÷ 70 mg = 0.8571 0.8571 × 75 mL = 64.2857 mL Rounding 64.2857 mL to the nearest whole number gives us 64 mL. Thus, the nurse should administer 64 mL.

Choice C:

Reason: To determine if 65 mL is correct, we follow the same calculation: 60 mg ÷ 70 mg = 0.8571 0.8571 × 75 mL = 64.2857 mL Rounding 64.2857 mL to the nearest whole number gives us 64 mL, not 65 mL. Therefore, 65 mL is incorrect.

Choice D:

Reason: To determine if 88 mL is correct, we follow the same calculation: 60 mg ÷ 70 mg = 0.8571 0.8571 × 75 mL = 64.2857 mL Rounding 64.2857 mL to the nearest whole number gives us 64 mL, not 88 mL. Therefore, 88 mL is incorrect.

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Question 2:

A client diagnosed with tuberculosis is prescribed rifampin, 4 mg/kg. 8 hourly for 6 days. The client weighs 43 kg. How many 100 mg bottles of rifampin will be required for this client?

Round your answer to the nearest whole number.

A. 21 B. 31 C. 52 D. 62

Answer and Explanation

Choice A:

Reason: To determine if 21 bottles are sufficient, we need to calculate the total dosage required. The client weighs 43 kg and is prescribed 4 mg/kg every 8 hours. This results in 172 mg per dose. With 3 doses per day, the daily dosage is 516 mg. Over 6 days, the total dosage is 3096 mg. Dividing this by 100 mg per bottle, we get 30.96 bottles. Rounding to the nearest whole number gives us 31 bottles. Therefore, 21 bottles are insufficient.

Choice B:

Reason: This choice is correct. As calculated, the total dosage required over 6 days is 3096 mg. Dividing by 100 mg per bottle results in 30.96 bottles, which rounds to 31 bottles. This matches the calculated requirement.

Choice C:

Choice C: 52

Reason: 52 bottles would be an overestimation. The total dosage required is 3096 mg, which translates to 30.96 bottles. Rounding to the nearest whole number gives us 31 bottles. Therefore, 52 bottles are significantly more than needed.

Choice D:

Reason: 62 bottles would also be an overestimation. The total dosage required is 3096 mg, which translates to 30.96 bottles. Rounding to the nearest whole number gives us 31 bottles. Therefore, 62 bottles are far more than needed.

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Question 3:

A client is prescribed a course of 600 mg/day of ciprofloxacin for 1 week to treat a throat infection. Each bottle contains 7 tablets that are 300 mg.

How many bottles would be required for the client's prescribed course of treatment throughout the week?

A. 1 bottle B. 2 bottles C. 3 bottles D. 4 bottles

Answer and Explanation

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Question 4:

A primary healthcare provider prescribes 15 g/day niacinamide to a client. Upon seeing the medication bottle, a nurse finds each tablet has a score mark.

What should the nurse do while administering this medication?

A. The nurse should give one tablet of medication daily. B. The nurse should give two tablets of medication thrice daily. C. The nurse should give half a tablet of medication to the client daily. D. The nurse should give four tablets of medication to the client every eight hours.

Answer and Explanation

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Question 5:

Robitussin DM contains 100 mg of guaifenesin per 1 teaspoon. How many milligrams of guaifenesin are in 10 mL?

A. 200 mg B. 100 mg C. 75 mg D. 50 mg

Answer and Explanation

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Question 6:

A client is prescribed 250 mg of metformin. The pharmacy supplies 500 mg pre- scored tablets of metformin. How should the nurse administer the medication to the client?

A. Administer one half tablet B. Administer two tablets C. Administer one tablet D. Administer one-and-a-half tablets

Answer and Explanation

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Question 7:

A patient is ordered Amoxil (amoxicillin) 0.5 grams by mouth three times per day. The concentration is 125 mg/5 mL.

How many milliliters per dose should the nurse administer to the patient?

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

Answer and Explanation

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Question 8:

A client is ordered Mylanta 1 tablespoon by mouth after meals and at bedtime. How many milliliters should the client take with each dose?

A. 5 mL B. 10 mL C. 15 mL D. 30 mL

Answer and Explanation

Choice A:

None

Choice B:

None

Choice C:

None

Choice D:

None

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Anne: This answer is incorrect. The correct answer is 1 TBSP = 15 ML ~ 5mos ago

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Question 9:

A client is prescribed 500 mL of a medication that is available in 2 mg/mL vials. How many mg of the medication should the client receive?

A. 250 mg B. 500 mg C. 1000 mg D. 1500 mg

Answer and Explanation

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Question 10:

A physician ordered 5 mL 10% dextrose stat. The only dextrose available is a vial of 5 mL 50% dextrose.
How can the nurse provide the appropriate dose?

A. Dextrose 50%, add 1 mL to 4 mL injectable saline B. Dextrose 50%, add 2 mL to 3 mL injectable saline C. Dextrose 50%, add 3 mL to 2 mL injectable saline D. Dextrose 50%, add 4 mL to 1 mL injectable saline E. Dextrose 50%, add 4 mL to 1 mL injectable saline

Answer and Explanation

Choice A:

To obtain 5 mL of 10% dextrose, 0.5 mL of the 50% dextrose should be diluted with 4.5 mL of sterile water or normal saline. Therefore, the nurse should add 1 mL of the 50% dextrose to 4 mL of injectable saline to get a final concentration of 10% dextrose in 5 mL. This will give the client the appropriate dose.

Choice B:

Choice B is incorrect because adding 2 mL of the 50% dextrose to 3 mL of saline would give a final concentration of 20%, which is higher than the prescribed concentration of 10%.

Choice C:

Choice C is incorrect because adding 3 mL of the 50% dextrose to 2 mL of saline would give a final concentration of 30%, which is significantly higher than the prescribed concentration of 10%.

Choice D:

Choice D is incorrect because adding 4 mL of the 50% dextrose to 1 mL of saline would give a final concentration of 40%, which is much higher than the prescribed concentration of 10%.

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Total Questions : 56

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Dosage Calculation

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