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The doctor orders 250 mg of an antibiotic. The stock supply is a vial of 250 mg of the drug. Directions say to reconstitute with 1.7 mL of sterile water to yield 2 mL of the drug. How many milliliters will you give for the correct dose?

A.

0.5 mL

B.

250 mL

C.

1.7 mL

D.

2 mL

Answer and Explanation

The Correct Answer is D

Given:

Ordered dose of antibiotic: 250 mg

Vial contains: 250 mg of antibiotic

Reconstitution volume: 1.7 mL of sterile water

Final volume after reconstitution: 2 mL

 

Step 1: Determine the concentration of the reconstituted solution:

Concentration (mg/mL) = Total amount of drug (mg) / Total volume (mL)

Concentration (mg/mL) = 250 mg / 2 mL

Concentration (mg/mL) = 125 mg/mL

 

Step 2: Calculate the volume to be administered:

Volume (mL) = Ordered dose (mg) / Concentration (mg/mL)

Volume (mL) = 250 mg / 125 mg/mL

Volume (mL) = 2 mL


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Related Questions

Correct Answer is B

Explanation

The concentration provided is 0.5 g/3 mL.

Convert grams to milligrams:

0.5g=500mg

Now, the concentration is 500 mg/3 mL.

Find the concentration in mg/mL:

Concentration=(500mg/3mL)≈166.67mg/mL

Next, to find the volume needed for a 10 mg dose, use the formula:

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

10mg/166.67mg/mL≈0.06mL/dose

Correct Answer is C

Explanation

Given:
Volume of fluid: 50 mL (DSW)
Infusion time: 30 minutes

Formula:
Flow rate (mL/hr) = Volume (mL) / Time (hr)

Step 1: Convert infusion time to hours:
Infusion time (hr) = 30 min / 60 min/hr
Infusion time (hr) = 0.5 hr

Step 2: Calculate the infusion rate in mL/hr:
Flow rate (mL/hr) = Volume (mL) / Infusion time (hr)
Flow rate (mL/hr) = 50 mL / 0.5 hr
Flow rate (mL/hr) = 100 mL/hr

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