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Pharmaceutical Calculations Flashcards

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

Read the first 7 Pharmaceutical Calculations flashcards as text

  1. A patient is prescribed amoxicillin 250 mg/5 mL oral suspension. The prescribed dose is 125 mg three times daily. How many mL should be administered per dose?

    Answer: 2.5 mL

    125 mg ÷ (250 mg/5 mL) = 125 ÷ 50 mg/mL = 2.5 mL per dose.

  2. A physician orders 1 L of normal saline to be infused over 8 hours. What is the correct infusion rate in mL/hr?

    Answer: 125 mL/hr

    1000 mL ÷ 8 hours = 125 mL/hr.

  3. What is the percentage strength (w/v) of a solution containing 5 g of sodium chloride dissolved in enough water to make 200 mL?

    Answer: 2.5%

    Percentage w/v = (5 g ÷ 200 mL) × 100 = 2.5%.

  4. A child weighs 22 lbs. The prescribed antibiotic dose is 10 mg/kg/day in two equally divided doses. How many mg should be given per dose?

    Answer: 50 mg

    22 lbs ÷ 2.2 = 10 kg; 10 kg × 10 mg/kg/day = 100 mg/day ÷ 2 doses = 50 mg per dose.

  5. How many grams of dextrose are contained in 500 mL of D5W (5% dextrose in water)?

    Answer: 25 g

    5% w/v = 5 g per 100 mL; 500 mL × 5 g/100 mL = 25 g of dextrose.

  6. A preparation is labeled as a 1:500 ratio strength solution. What is this expressed as a percentage strength?

    Answer: 0.2%

    1:500 = 1 g per 500 mL = 0.2 g per 100 mL = 0.2%.

  7. A patient is prescribed metformin 1 g twice daily. Metformin tablets are available as 500 mg. How many tablets are required per day?

    Answer: 4 tablets

    1 g = 1000 mg; 1000 mg ÷ 500 mg/tablet = 2 tablets per dose × 2 doses/day = 4 tablets/day.

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