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The healthcare provider prescribes penicillin G benzathine 1,800,000 units intramuscular (IM) for a client with a bacterial infection. The prefilled syringe is labeled, "Penicillin G benzathine 1,200,000 units/2 mL." How many mL should the nurse administer to this client? (Enter numerical value only, rounded to the nearest whole number.)
Answer and Explanation

The Correct Answer is ["3"]

Concentration of penicillin G benzathine: 1,200,000 units/2 mL (given on the syringe label)

Prescribed dose: 1,800,000 units

We need to find the volume (in mL) that delivers the prescribed dose (1,800,000 units) considering the available concentration.

Dosage calculation:

To administer the prescribed dose, we need to find the volume that contains at least 1,800,000 units.

Since the available concentration is 1,200,000 units/2 mL, one prefilled syringe provides 1,200,000 units.

We can calculate the number of syringes needed to deliver the prescribed dose:

Number of syringes = Prescribed dose (units) / Concentration per syringe (units)

Number of syringes = 1,800,000 units / 1,200,000 units/syringe

Number of syringes = 1.5 (round up to 2 since a partial dose wouldn't be sufficient)

2 mL per syringe x 2 syringes = 4 mL

However, the prefilled syringes likely come in whole-number doses. Checking the available options:

A single prefilled syringe provides 1,200,000 units (which is not enough).

Two prefilled syringes would provide a total of 2,400,000 units (more than enough).

Therefore, to ensure at least the prescribed dose is administered, the nurse should administer 3 mL. 

This is achieved by using one and a half (rounded up to two) prefilled syringes.


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Related Questions

Correct Answer is ["0.64"]

Explanation

Here's the calculation to determine the volume to administer:

Prescribed dose: 40 mg methylprednisolone

Medication vial concentration: 125 mg per 2 mL (given on the vial label)

We need to find the volume (mL) containing the prescribed dose (40 mg) of methylprednisolone.

Calculation:

Volume to administer (mL) = Dose (mg) / Concentration (mg/mL)

Since the concentration is given in mg per 2 mL, we need to adjust it to mg/mL for accurate calculation:

Concentration (mg/mL) = Total mg / Volume (mL)

Concentration (mg/mL) = 125 mg / 2 mL

Concentration (mg/mL) = 62.5 mg/m

Now, with the concentration in mg/mL, we can calculate the volume to administer:

Volume to administer (mL) = 40 mg / 62.5 mg/mL

Volume to administer (mL) = 0.64 mL (round to nearest hundredth as requested)

Therefore, the nurse should administer 0.64 mL of methylprednisolone.

Correct Answer is ["440"]

Explanation

The pharmacy provides a 110 mL premixed solution of pantoprazole to be infused over 15 minutes.

First, let’s find out how many mL should be delivered per minute.

We divide the total volume by the total time in minutes:

RateinmL/min = 110mL /15min ​≈ 7.33mL/min

We need to convert this to mL/hr since we want the rate in mL/hr.

There are 60 minutes in an hour, so:

RateinmL/hr = 7.33mL/min×60 = 440mL/hr

So, the nurse should program the secondary infusion to deliver 440 mL/hr.

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