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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 patient weighs 88 kg and is prescribed 5 mg/kg/day of a medication divided into two doses. What is each dose in mg?

    Answer: 220 mg

    Daily dose: 88 kg × 5 mg/kg = 440 mg/day. Each dose: 440 ÷ 2 = 220 mg.

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

    Answer: 25 g

    5% means 5 g per 100 mL. In 500 mL: 5 g/100 mL × 500 mL = 25 g.

  3. A prescription reads: metformin 1,000 mg PO BID × 30 days. How many tablets of 500 mg strength are needed to fill this prescription?

    Answer: 120 tablets

    1,000 mg ÷ 500 mg/tab = 2 tabs per dose. BID = 2 doses/day. 2 × 2 × 30 = 120 tablets.

  4. An ointment requires 3% salicylic acid. The pharmacy has 6% and 1% preparations. Using alligation, what ratio of 6% to 1% is needed?

    Answer: 2:3

    Alligation: higher (6%) – desired (3%) = 3 parts of lower; desired (3%) – lower (1%) = 2 parts of higher. Ratio 6%:1% = 2:3.

  5. Convert 2.5 tablespoons to mL. (1 tablespoon = 15 mL)

    Answer: 37.5 mL

    2.5 tbsp × 15 mL/tbsp = 37.5 mL.

  6. A solution contains 250 mcg/mL. A patient needs 0.5 mg. How many mL should be administered?

    Answer: 2 mL

    0.5 mg = 500 mcg. 500 mcg ÷ 250 mcg/mL = 2 mL.