Which concentration corresponds to a 1:200,000 epinephrine mixture?

Which concentration corresponds to a 1:200,000 epinephrine mixture?

• A. 0.5 µg/mL
• B. 5 µg/mL
• C. 50 µg/mL
• D. 0.5 mg/mL

Answer: (B)

A 1:200,000 dilution means 1 mg of epinephrine in 200,000 mL of solution. Divide 1 mg by 200,000 mL to get the amount per milliliter: 0.005 mg/mL, which is 5 µg/mL. So the concentration is 5 micrograms per milliliter. This matches the option that lists 5 µg/mL. In practice, 1:200,000 is a common dilution for epinephrine to provide vasoconstriction with lower systemic effects. The other options are either more dilute or more concentrated than this ratio.

A 1:200,000 dilution means 1 mg of epinephrine in 200,000 mL of solution. Divide 1 mg by 200,000 mL to get the amount per milliliter: 0.005 mg/mL, which is 5 µg/mL. So the concentration is 5 micrograms per milliliter. This matches the option that lists 5 µg/mL. In practice, 1:200,000 is a common dilution for epinephrine to provide vasoconstriction with lower systemic effects. The other options are either more dilute or more concentrated than this ratio.