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Dosage Calculations Flashcards

7 cards from real CPHT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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

    Answer: 105 mL

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

  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?

    Answer: 0.09 mL/hr

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

  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?

    Answer: 75%

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

  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?

    Answer: 80 g

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

  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?

    Answer: 12 bags

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

  6. A stock vial contains 40 mg/mL of a drug. The order is for 60 mg. After drawing the dose, what volume remains in the vial if it originally held 5 mL?

    Answer: 2.5 mL

    60 mg ÷ 40 mg/mL = 1.5 mL used; 5 mL − 1.5 mL = 3.5 mL remaining.

  7. A nitroglycerin drip runs at 20 mL/hr. The bag is 250 mL of nitroglycerin 50 mg/250 mL. How many mcg/min is the patient receiving?

    Answer: 67 mcg/min

    Concentration = 50 mg ÷ 250 mL = 0.2 mg/mL; 20 mL/hr × 0.2 mg/mL = 4 mg/hr = 4,000 mcg/hr ÷ 60 = 66.7 ≈ 67 mcg/min.