How much epinephrine is in two carpules?

How much epinephrine is in two carpules?

• A. 0.018 ml in two carpules
• B. 0.036 ml in two carpules
• C. 0.072 ml in two carpules
• D. 0.144 ml in two carpules

Answer: (B)

The main idea is multiplying concentration by volume to get the total amount of drug delivered. A standard carpule contains 1.8 mL of solution, and epinephrine at a common dental concentration of 1:100,000 equals 0.01 mg per mL. So per carpule: 0.01 mg/mL × 1.8 mL = 0.018 mg of epinephrine. For two carpules, double that: 0.018 mg × 2 = 0.036 mg. Thus, the amount of epinephrine in two carpules is 0.036 mg. (If the options are presented in milliliters, note that this is a mass, not a volume, since the dose is expressed as milligrams.)

The main idea is multiplying concentration by volume to get the total amount of drug delivered. A standard carpule contains 1.8 mL of solution, and epinephrine at a common dental concentration of 1:100,000 equals 0.01 mg per mL. So per carpule: 0.01 mg/mL × 1.8 mL = 0.018 mg of epinephrine. For two carpules, double that: 0.018 mg × 2 = 0.036 mg.

Thus, the amount of epinephrine in two carpules is 0.036 mg. (If the options are presented in milliliters, note that this is a mass, not a volume, since the dose is expressed as milligrams.)