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A nurse is preparing to administer lithium 300 mg PO to a client who has bipolar disorder. Available is lithium 150 mg capsules. How many capsules should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

A.

1.5 caps

B.

0.5 caps

C.

1 cap

D.

2 caps

Answer and Explanation

The Correct Answer is D

Given:

Ordered dose of Lithium: 300 mg

Available Lithium capsules: 150 mg/capsule

 

Step 1: Calculate the number of capsules required:

Number of capsules = Desired dose (mg) / Strength of each capsule (mg/capsule)

Number of capsules = 300 mg / 150 mg/capsule

Number of capsules = 2 capsules


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Related Questions

Correct Answer is A

Explanation

Given:

Ordered dose of Dopamine: 3 mcg/kg/min

Child's weight: 41.8 lbs

Concentration of Dopamine: 400 mg in 250 mL D5W

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

1 pound (lb) = 0.453592 kilograms (kg)

Child's weight in kg = 41.8 lbs x 0.453592 kg/lb = 18.935 kg

Step 2: Calculate the total dose of Dopamine in mcg/min:

Total dose (mcg/min) = Ordered dose (mcg/kg/min) x Child's weight (kg)

Total dose (mcg/min) = 3 mcg/kg/min x 18.935 kg

Total dose (mcg/min) = 56.805 mcg/min

Step 3: Convert mcg to mg:

Total dose (mg/min) = Total dose (mcg/min) / 1000 mcg/mg

Total dose (mg/min) = 56.805 mcg/min / 1000 mcg/mg

Total dose (mg/min) = 0.056805 mg/min

Step 4: Calculate the total dose in mg/hr:

Total dose (mg/hr) = Total dose (mg/min) x 60 min/hr

Total dose (mg/hr) = 0.056805 mg/min x 60 min/hr

Total dose (mg/hr) = 3.4083 mg/hr

Step 5: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Total dose (mg/hr) / Concentration (mg/mL)

Infusion rate (mL/hr) = 3.4083 mg/hr / (400 mg/250 mL)

Infusion rate (mL/hr) = 3.4083 mg/hr x (250 mL/400 mg)

Infusion rate (mL/hr) = 2.1301875 mL/hr

Step 6: Round to the nearest tenth:

Infusion rate (mL/hr) ≈ 2.1 mL/hr

Correct Answer is D

Explanation

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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