A 1.8 mL cartridge contains how many milligrams of epinephrine when the solution is 1%?

A 1.8 mL cartridge contains how many milligrams of epinephrine when the solution is 1%?

• A. 9 mg
• B. 18 mg
• C. 27 mg
• D. 36 mg

Answer: (B)

Percent concentration tells you how much drug is in each milliliter. A 1% solution has 1 g per 100 mL, which is 0.01 g per mL, or 10 mg per mL. In a 1.8 mL cartridge, multiply: 10 mg/mL × 1.8 mL = 18 mg of epinephrine.

Percent concentration tells you how much drug is in each milliliter. A 1% solution has 1 g per 100 mL, which is 0.01 g per mL, or 10 mg per mL. In a 1.8 mL cartridge, multiply: 10 mg/mL × 1.8 mL = 18 mg of epinephrine.