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Pharmacology · single question

Calculate the amount of epinephrine in 1 carpule of 1.8 mL lidocaine 1:100,000.

  1. 0.01 mg/mL
  2. 0.02 mg/mL
  3. 0.2 mg/mL
  4. 1 mg/mL
Show answer and explanation

Correct answer: A. 0.01 mg/mL

  • A. Correct. A 1:100,000 dilution equals 0.01 mg/mL of epinephrine, regardless of carpule volume.
  • B. 0.02 mg/mL corresponds to a 1:50,000 dilution, not 1:100,000.
  • C. This is 20× too concentrated for a 1:100,000 dilution.
  • D. This is far too concentrated — not consistent with any standard dental epinephrine dilution.

Note: Reference concentrations: 1:50,000 = 0.02 mg/mL | 1:100,000 = 0.01 mg/mL | 1:200,000 = 0.005 mg/mL. This concentration is independent of the carpule volume.

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