Order: diphenhydramine 25 mg PO q6h, PRN
Available: diphenhydramine 12.5 mg/5 mL.
How many mL would the nurse give?
5 mL
20 mL
15 mL
10 mL
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
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Given:
Ordered dose of phenobarbital: 6 mg/kg/day divided equally every 12 hours
Patient weight: 44 lbs
Concentration of phenobarbital elixir: 20 mg/5 mL
Step 1: Convert patient weight from pounds to kilograms:
1 pound (lb) = 0.453592 kilograms (kg)
Patient weight in kg = 44 lbs x 0.453592 kg/lb = 19.958 kg
Step 2: Calculate the total daily dose of phenobarbital:
Total daily dose (mg) = Ordered dose (mg/kg/day) x Patient weight (kg)
Total daily dose (mg) = 6 mg/kg/day x 19.958 kg
Total daily dose (mg) = 119.748 mg/day
Step 3: Calculate the dose per administration:
Dose per administration (mg) = Total daily dose (mg) / Number of administrations per day
Dose per administration (mg) = 119.748 mg/day / 2 administrations/day
Dose per administration (mg) = 59.874 mg
Step 4: Calculate the volume to be administered per dose:
Volume (mL) = Dose per administration (mg) / Concentration (mg/mL)
Volume (mL) = 59.874 mg / (20 mg/5 mL)
Volume (mL) = 59.874 mg x (5 mL / 20 mg)
Volume (mL) = 14.9685 mL
Step 5: Round to the nearest whole number:
Volume (mL) ≈ 15 mL
Correct Answer is C
Explanation
To calculate:
1. Convert units:
1 oz = 30 mL
3 oz formula = 3 oz x 30 mL/oz = 90 mL
2 oz juice = 2 oz x 30 mL/oz = 60 mL
2. Calculate total oral intake:
Total oral intake = 10 mL (medication) + 90 mL (formula) + 60 mL (juice) = 160 mL
3. Calculate IV fluid intake:
IV fluid intake = 20 mL/hr x 8 hr = 160 mL
4. Calculate total fluid intake:
Total fluid intake = 160 mL (oral) + 160 mL (IV) = 320 mL
Answer: 320 mL
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