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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 D

Explanation

Ordered dose of 0.9% Sodium Chloride: 20 mL/kg

Child's weight: 55 lbs

Infusion time: 6 hours

Step 1: Convert child's weight from pounds to kilograms:

1 pound (lb) = 0.453592 kilograms (kg)

Child's weight in kg = 55 lbs x 0.453592 kg/lb = 24.94756 kg

Step 2: Calculate the total volume of 0.9% Sodium Chloride:

Total volume (mL) = Ordered dose (mL/kg) x Child's weight (kg)

Total volume (mL) = 20 mL/kg x 24.94756 kg

Total volume (mL) = 498.9512 mL

Step 3: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Total volume (mL) / Infusion time (hr)

Infusion rate (mL/hr) = 498.9512 mL / 6 hr

Infusion rate (mL/hr) = 83.15853333 mL/hr

Step 4: Round to the nearest whole number:

Infusion rate (mL/hr) ≈ 83 mL/hr

Correct Answer is D

Explanation

Convert ounces to millilitres (1 oz = 29.5735 mL):

6oz×29.5735mL/oz=177.441mL6

Calculate the frequency of doses per day:

The patient receives a dose every 4 hours, so in 24 hours, the number of doses is:

24hours/4hours/dose=6doses

Calculate the total volume for all doses:

177.441mL/dose×6doses=1064.646mL

Rounding to the nearest whole number=1080 mL

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