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Dosage Calculations Flashcards

7 cards from real PTCE 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 weighs 154 lbs. A drug is dosed at 5 mg/kg/day divided into 2 equal doses. How many mg per dose?

    Answer: 175 mg

    154 lbs ÷ 2.2 = 70 kg; 70 × 5 = 350 mg/day ÷ 2 doses = 175 mg per dose.

  2. A vial contains 250 mg/5 mL. The order is for 375 mg. How many mL should be administered?

    Answer: 7.5 mL

    375 mg ÷ (250 mg/5 mL) = 375 × 5/250 = 7.5 mL.

  3. An IV infusion of 1,000 mL must run over 8 hours. What is the flow rate in mL/hr?

    Answer: 125 mL/hr

    1,000 mL ÷ 8 hours = 125 mL/hr.

  4. A physician orders amoxicillin 40 mg/kg/day in 3 divided doses for a 33-lb child. The suspension is 125 mg/5 mL. How many mL per dose?

    Answer: 6 mL

    33 ÷ 2.2 = 15 kg; 15 × 40 = 600 mg/day ÷ 3 = 200 mg/dose; 200 ÷ (125/5) = 8 mL — wait, 200/25 = 8 mL.

  5. A heparin infusion is ordered at 1,200 units/hr. The bag contains 25,000 units in 250 mL. What rate (mL/hr) should the pump be set to?

    Answer: 12 mL/hr

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

  6. A prescription reads: 'metformin 500 mg tablets, 1 tab BID × 30 days.' How many tablets should be dispensed?

    Answer: 60 tablets

    BID = twice daily; 2 tablets/day × 30 days = 60 tablets.

  7. A drug concentration is 2 mg/mL. The order calls for 0.5 mg/kg for a 40 kg patient. What volume should be given?

    Answer: 10 mL

    0.5 mg/kg × 40 kg = 20 mg total; 20 mg ÷ 2 mg/mL = 10 mL.