Local Anaesthetic Dosing — NDEB AFK MCQ
Instant feedback + full explanation. One question, done properly.
Educational content. Not a substitute for clinical judgement or local policy.
Reveal the answer and explanation
Correct answer: C — 490 mg
The maximum recommended dose of lidocaine with epinephrine is 7.0 mg/kg (up to an absolute maximum of 500 mg). For a 70 kg patient: 7.0 mg/kg × 70 kg = 490 mg. This equals approximately 14 cartridges of 2% lidocaine (each 1.7 mL cartridge contains 34 mg). However, the epinephrine limit (200 μg for healthy adults) restricts the actual maximum to approximately 11 cartridges with 1:100,000 epinephrine.
Reference: Malamed – Handbook of Local Anesthesia, 7th ed., 2020