CPhT Dosage Calculations 5

Question 1

A prescription calls for 1 tsp of a liquid medication TID for 7 days. How many mL should be dispensed?

Accepted Answer

105 mL

Answer

1 tsp = 5 mL; 5 mL × 3 doses/day × 7 days = 105 mL.

Question 2

A physician orders insulin at 0.1 units/kg/hr for a 90 kg patient. If regular insulin is 100 units/mL, what rate in mL/hr should the pump be set to?

Accepted Answer

0.09 mL/hr

Answer

0.1 units/kg/hr × 90 kg = 9 units/hr; 9 units/hr ÷ 100 units/mL = 0.09 mL/hr.

Question 3

A drug has a maintenance dose of 200 mg q6h. A patient missed one dose. Over 24 hours the patient received 600 mg total. What percentage of the ordered daily dose did the patient receive?

Accepted Answer

75%

Answer

Daily ordered dose = 200 mg × 4 = 800 mg; 600 mg ÷ 800 mg × 100 = 75%.

Question 4

A pharmacist needs to make 200 mL of a 1% hydrocortisone cream from 2.5% stock cream. How many grams of stock cream are needed?

Accepted Answer

80 g

Answer

C1V1 = C2V2: 2.5 × V1 = 1 × 200; V1 = 80 g of stock cream.

Question 5

A patient receives 2 L of IV fluid per day. The bag used holds 500 mL. How many bags will be used in 3 days?

Accepted Answer

12 bags

Answer

2,000 mL/day ÷ 500 mL/bag = 4 bags/day × 3 days = 12 bags.

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CPhT Dosage Calculations 5