Robitussin 100 mg IM; the solution contains 50 mg per 5 mL. How many milliliters are needed to administer 100 mg?

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Multiple Choice

Robitussin 100 mg IM; the solution contains 50 mg per 5 mL. How many milliliters are needed to administer 100 mg?

The needed dose depends on the concentration of the solution. This mixture has 50 mg in 5 mL, which is 10 mg per 1 mL. To deliver 100 mg, you divide 100 mg by 10 mg/mL, giving 10 mL. So, 10 mL of this solution provides the required 100 mg. Quick check: 10 mL × 10 mg/mL = 100 mg. Using 5 mL would give 50 mg, 15 mL would give 150 mg, and 20 mL would give 200 mg.

The needed dose depends on the concentration of the solution. This mixture has 50 mg in 5 mL, which is 10 mg per 1 mL. To deliver 100 mg, you divide 100 mg by 10 mg/mL, giving 10 mL. So, 10 mL of this solution provides the required 100 mg. Quick check: 10 mL × 10 mg/mL = 100 mg. Using 5 mL would give 50 mg, 15 mL would give 150 mg, and 20 mL would give 200 mg.

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