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Dosage Calculations Flashcards

6 cards from real Pharmacy 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 500 mg of amoxicillin. The available stock is 250 mg/5 mL. How many mL should be dispensed per dose?

    Answer: 10 mL

    Using the ratio: 250 mg/5 mL = 500 mg/x. Solving: x = (500 × 5) / 250 = 10 mL.

  2. A patient needs 0.4 mg of clonidine. The available tablets are 0.2 mg each. How many tablets should be given?

    Answer: 2 tablets

    0.4 mg ÷ 0.2 mg/tablet = 2 tablets.

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

    Answer: 125 mL/hr

    1,000 mL ÷ 8 hr = 125 mL/hr.

  4. A prescription calls for 1.5 g of a drug. How many milligrams is this?

    Answer: 1,500 mg

    1 g = 1,000 mg, so 1.5 g = 1,500 mg.

  5. A technician needs to prepare 240 mL of a 2% solution using a 10% stock solution. How many mL of stock solution are needed?

    Answer: 48 mL

    Using alligation or C1V1 = C2V2: 10% × V1 = 2% × 240 mL → V1 = 480/10 = 48 mL.

  6. A drop factor is 15 gtts/mL and the ordered rate is 90 mL/hr. What is the drip rate in gtts/min?

    Answer: 22.5 gtts/min

    (90 mL/hr × 15 gtts/mL) ÷ 60 min = 1350/60 = 22.5 gtts/min.