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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 patient requires 0.5 mg of a drug available as 0.25 mg/5 mL oral solution. How many mL should be dispensed per dose?

    Answer: 10 mL

    0.5 mg ÷ 0.25 mg × 5 mL = 10 mL per dose.

  2. A physician orders heparin 25,000 units in 250 mL NS to infuse at 1,000 units/hr. What is the flow rate in mL/hr?

    Answer: 10 mL/hr

    Concentration = 25,000 units ÷ 250 mL = 100 units/mL; 1,000 units/hr ÷ 100 units/mL = 10 mL/hr.

  3. A child weighing 22 kg needs amoxicillin 40 mg/kg/day divided every 8 hours. How many mg per dose?

    Answer: 293 mg

    22 kg × 40 mg/kg = 880 mg/day ÷ 3 doses = 293.3 mg per dose.

  4. An IV bag contains 1 g of drug in 100 mL. The order is to give 250 mg. How many mL should be administered?

    Answer: 25 mL

    1 g = 1,000 mg; 250 mg ÷ 1,000 mg × 100 mL = 25 mL.

  5. A patient is prescribed metformin 1 g twice daily. The tablets available are 500 mg each. How many tablets per day?

    Answer: 4 tablets

    1 g = 1,000 mg; each dose = 1,000 mg ÷ 500 mg = 2 tablets; twice daily = 4 tablets/day.

  6. Dopamine 400 mg is added to 250 mL D5W. The order is 5 mcg/kg/min for a 70 kg patient. What is the infusion rate in mL/hr?

    Answer: 13.1 mL/hr

    Dose = 5 mcg/kg/min × 70 kg = 350 mcg/min = 21,000 mcg/hr = 21 mg/hr; concentration = 400 mg ÷ 250 mL = 1.6 mg/mL; 21 mg/hr ÷ 1.6 mg/mL ≈ 13.1 mL/hr.

  7. A drug is available as a 2% w/v solution. How many grams of drug are in 500 mL of this solution?

    Answer: 10 g

    2% w/v = 2 g per 100 mL; 2 g × 5 = 10 g in 500 mL.