A drug concentration is 25 mg/mL. If you need a 200 mg dose, how many milliliters should you draw up?

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Multiple Choice

A drug concentration is 25 mg/mL. If you need a 200 mg dose, how many milliliters should you draw up?

Explanation:
To determine the volume, use the relationship dose = concentration × volume. If the concentration is 25 mg per 1 mL, then 1 mL contains 25 mg, so 25 mg × V mL = 200 mg. Solving for V gives V = 200 ÷ 25 = 8 mL. Check: 8 mL × 25 mg/mL = 200 mg. Draw up 8 mL.

To determine the volume, use the relationship dose = concentration × volume. If the concentration is 25 mg per 1 mL, then 1 mL contains 25 mg, so 25 mg × V mL = 200 mg. Solving for V gives V = 200 ÷ 25 = 8 mL. Check: 8 mL × 25 mg/mL = 200 mg. Draw up 8 mL.

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