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The doctor orders Pepcid 10 mg by mouth three times a day. Instructions on the container say to reconstitute with water to make a concentration of 0.5 g/3 mL. How many ml/dose would you administer?

A.

1

B.

0.06

C.

16.7

D.

0.12

Answer and Explanation

The Correct Answer is B

The concentration provided is 0.5 g/3 mL.

Convert grams to milligrams:

0.5 g=500 mg

 

Now, the concentration is 500 mg/3 mL.

Find the concentration in mg/mL:

Concentration=(500 mg/3 mL)≈166.67 mg/mL

 

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

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

10 mg/166.67 mg/mL≈0.06 mL/dose


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Related Questions

Correct Answer is D

Explanation

Given:

Volume of fluid: 500 mL

Infusion time: 6 hours

Drop factor: 15 gtt/mL

Formula for mL/hr:

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

Step 1: Calculate the flow rate in mL/hr:

Flow rate (mL/hr) = 500 mL / 6 hr

Flow rate (mL/hr) = 83.33 mL/hr

Formula for gtt/min:

Flow rate (gtt/min) = (Volume (mL) / Time (hr)) x Drop factor (gtt/mL) / 60 min/hr

Step 2: Calculate the flow rate in gtt/min:

Flow rate (gtt/min) = (500 mL / 6 hr) x 15 gtt/mL / 60 min/hr

Flow rate (gtt/min) = 83.33 mL/hr x 15 gtt/mL / 60 min/hr

Flow rate (gtt/min) = 1250 gtt/hr / 60 min/hr

Flow rate (gtt/min) = 20.83 gtt/min

Step 3: Round to the nearest whole number:

Flow rate (mL/hr) ≈ 83 mL/hr

Flow rate (gtt/min) ≈ 21 gtt/min

Correct Answer is B

Explanation

Given:
Volume of fluid: 50 mL
Infusion time: 1 hour (60 minutes)
Drop factor: 15 gtt/mL

Formula:
Flow rate (gtt/min) = (Volume (mL) / Time (min)) x Drop factor (gtt/mL)

Step 1: Calculate the infusion rate in mL/min:
Infusion rate (mL/min) = Volume (mL) / Time (min)
Infusion rate (mL/min) = 50 mL / 60 min
Infusion rate (mL/min) = 0.83 mL/min

Step 2: Calculate the flow rate in gtt/min:
Flow rate (gtt/min) = Infusion rate (mL/min) x Drop factor (gtt/mL)
Flow rate (gtt/min) = 0.83 mL/min x 15 gtt/mL
Flow rate (gtt/min) = 12.5 gtt/min

Step 3: Round to the nearest whole number:
Flow rate (gtt/min) ≈ 13 gtt/min

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