How many milligrams of lidocaine are contained in a 1.8 mL cartridge of 2% lidocaine with 1:100,000 epinephrine?

  • Correct answer

    36 mg

  • 18 mg

  • 3.6 mg

  • 72 mg

This question is one of 15 in AFK practice: Pharmacology, local anesthesia and emergencies. Test yourself on all of them.

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Explanations

  • A 2% solution contains 2 g per 100 mL, or 20 mg/mL, so 1.8 mL contains 36 mg. 18 mg results from mistakenly treating 2% as 10 mg/mL.

    Source: Malamed, Handbook of Local Anesthesia — oneguy

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