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Order: diphenhydramine 25 mg PO q6h, PRN

Available: diphenhydramine 12.5 mg/5 mL.

How many mL would the nurse give?

A.

5 mL

B.

20 mL

C.

15 mL

D.

10 mL

Answer and Explanation

The Correct Answer is D

Given:

Ordered dose of diphenhydramine: 25 mg

Available diphenhydramine: 12.5 mg/5 mL

Step 1: Set up the proportion:

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

Step 2: Substitute the values:

25 mg / Volume = 12.5 mg/5 mL

Step 3: Solve for the unknown volume:

Volume = 25 mg / (12.5 mg/5 mL)

Volume = 25 mg x (5 mL / 12.5 mg)

Volume = 10 mL


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Related Questions

Correct Answer is A

Explanation

Given:

Volume of fluid: 100 mL

Infusion time: 45 minutes

Step 1: Convert infusion time to hours:

Infusion time (hr) = 45 min / 60 min/hr

Infusion time (hr) = 0.75 hr

Step 2: Calculate the infusion rate in mL/hr:

Flow rate (mL/hr) = Volume (mL) / Infusion time (hr)

Flow rate (mL/hr) = 100 mL / 0.75 hr

Flow rate (mL/hr) = 133.3333333 mL/hr

Step 3: Round to the nearest whole number:

Flow rate (mL/hr) ≈ 133 mL/hr

Correct Answer is A

Explanation

Given:

Infusion rate: 3 mL/hr

Concentration of Nitroglycerin: 50 mg in 250 mL D5W (200 mcg/mL)

Step 1: Calculate the dose in mg/hr:

Dose (mg/hr) = Infusion rate (mL/hr) x Concentration (mg/mL)

Dose (mg/hr) = 3 mL/hr x 200 mcg/mL

Dose (mg/hr) = 600 mcg/hr

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