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A nurse is preparing to administer penicillinG benzathine 200,000 units IM to a school-age child. Available is penicillinG benzathine injection 600,000 units/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer and Explanation

The Correct Answer is ["0.3"]

Given:

Desired dose: Penicillin G benzathine 200,000 units IM

Available concentration: Penicillin G benzathine injection 600,000 units/mL

To find:

Volume to administer (in mL)

Step 1: Set up the proportion

We can use the following proportion to solve the problem:

(Desired dose) / (Available concentration) = Volume to administer

Step 2: Substitute the values

Plugging in the given values, we get:

(200,000 units) / (600,000 units/mL) = Volume to administer

Step 3: Simplify

To simplify, we can invert the denominator and multiply:

(200,000 units) * (1 mL / 600,000 units) = Volume to administer

The "units" cancel out, leaving us with:

(200,000 * 1 mL) / 600,000 = Volume to administer

Step 4: Calculate

Performing the multiplication and division, we get:

200,000 mL / 600,000 = Volume to administer

0.33 mL = Volume to administer

Step 5: Round to the nearest whole number

Since the question asks for the volume rounded to the nearest whole number, we round 0.3.

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Correct Answer is D

Explanation

A) Give the client two troches in the morning and two troches in the evening:
While this option describes the correct number of doses, it does not address the critical aspect of how the troche should be administered. The troche must dissolve in the mouth, not be swallowed immediately, and the focus should be on how the medication is used rather than the total number of doses per day. The timing of doses (morning and evening) is correct, but the method of administration needs further clarification.

B) Tell the client to keep the troche under the tongue for 5 min before swallowing it:
Troches should not be kept under the tongue or swallowed after a short duration. The medication is intended to dissolve in the mouth, where it can act locally. Keeping it under the tongue or swallowing it too soon would reduce its efficacy in treating fungal infections of the mouth or throat. Therefore, this instruction is incorrect.

C) Instruct the client to swallow the troche with 240 mL (8 oz) water:
Swallowing the troche with water is not appropriate because it prevents the medication from dissolving properly in the mouth. Nystatin troches are designed to dissolve slowly in the mouth, releasing medication to treat the infection. Swallowing it immediately would bypass the intended mechanism of action. Therefore, this instruction is incorrect.

D) Withhold oral intake until the troche dissolves in the client's mouth:
This is the correct instruction. Nystatin troches need to dissolve slowly in the mouth to ensure the medication can work locally on the fungal infection. The client should not swallow the troche immediately and should wait until it has fully dissolved, which can take several minutes. This allows for the proper therapeutic effect in treating infections of the mouth or throat.

Correct Answer is ["1.1"]

Explanation

Step-by-Step Solution:

Convert the adolescent's weight from pounds to kilograms.

1 pound is = 0.453592 kilograms.

79 pounds = 79 x 0.453592 = 35.793592 kilograms.

Calculate the total dose of dimercaprol.

The prescribed dose is 3 mg/kg.

The adolescent weighs 35.793592 kg.

The total dose = 3 mg/kg x 35.793592 kg = 107.380776 mg.

Calculate the volume of dimercaprol injection to administer.

The available dimercaprol injection is 100 mg/mL.

To find the volume, we can set up a proportion:

100 mg / 1 mL = 107.380776 mg / x mL

Cross-multiplying:

100x = 107.380776

Solving for x:

x = 107.380776 / 100 = 1.07380776 mL

Round the answer to the nearest tenth: 1.1 mL.

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Naxlex Comprehensive Predictor Exams

A nurse is reviewing a prescription for nystatin 200,000 units in a troche PO 4 times per day. How should the nurse interpret this prescription?

Correct Answer is D

Explanation

A nurse is preparing to administer dimercaprol 3 mg/kg IM to an adolescent who weighs 79 lb. Available is dimercaprol injection 100 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Correct Answer is ["1.1"]

Explanation

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