In a 1.8 mL cartridge containing 3% epinephrine, how many milligrams of epinephrine are present?

In a 1.8 mL cartridge containing 3% epinephrine, how many milligrams of epinephrine are present?

• A. 18 mg
• B. 36 mg
• C. 54 mg
• D. 72 mg

Answer: (C)

A 3% solution means 30 mg of epinephrine per milliliter (3 g per 100 mL). In a 1.8 mL cartridge, the total amount is 30 mg/mL × 1.8 mL = 54 mg. The other numbers correspond to different concentrations: 18 mg would come from about 1% (10 mg/mL), 36 mg from about 2% (20 mg/mL), and 72 mg from about 4% (40 mg/mL).

A 3% solution means 30 mg of epinephrine per milliliter (3 g per 100 mL). In a 1.8 mL cartridge, the total amount is 30 mg/mL × 1.8 mL = 54 mg. The other numbers correspond to different concentrations: 18 mg would come from about 1% (10 mg/mL), 36 mg from about 2% (20 mg/mL), and 72 mg from about 4% (40 mg/mL).