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Pharmaceutical Calculations Flashcards

7 cards from real PEBC 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 physician orders amoxicillin 40 mg/kg/day divided every 8 hours for a child weighing 22 kg. How many mg should be given per dose?

    Answer: 293 mg

    40 mg/kg/day × 22 kg = 880 mg/day divided into 3 doses (every 8 hours) = 293 mg per dose.

  2. A pharmacist needs to prepare 250 mL of a 0.9% NaCl solution. How many grams of NaCl are required?

    Answer: 2.25 g

    0.9% means 0.9 g per 100 mL; therefore 0.9 × (250/100) = 2.25 g of NaCl are needed.

  3. An IV infusion of 1000 mL is to be administered over 8 hours using a drip set delivering 20 drops/mL. What is the drip rate in drops per minute?

    Answer: 42 drops/min

    1000 mL ÷ 8 hr = 125 mL/hr; 125 mL/hr ÷ 60 min × 20 drops/mL ≈ 42 drops/min.

  4. A medication is available as 250 mg/5 mL. A patient needs a 375 mg dose. How many mL should be dispensed?

    Answer: 7.5 mL

    Using proportion: 375 mg × (5 mL / 250 mg) = 7.5 mL.

  5. How many milligrams of drug are contained in 2 L of a 1:5000 solution?

    Answer: 400 mg

    1:5000 means 1 g per 5000 mL = 0.2 mg/mL; 0.2 mg/mL × 2000 mL = 400 mg.

  6. A patient is to receive heparin 25,000 units in 250 mL NS at 1,200 units/hour. What is the correct infusion rate in mL/hour?

    Answer: 12 mL/hr

    Concentration = 25,000 units ÷ 250 mL = 100 units/mL; 1,200 units/hr ÷ 100 units/mL = 12 mL/hr.

  7. What is the percentage strength (w/v) of a solution made by dissolving 5 g of drug in enough water to make 200 mL?

    Answer: 2.5%

    Percentage (w/v) = (grams of solute / mL of solution) × 100 = (5 / 200) × 100 = 2.5%.