Table 3.

Example calculations of maximum dose for local anaesthetic for various patients

Information	Calculation and maximum
20 kg patient (e.g. a 5-year-old) 2% lidocaine with 1:100,000 epinephrine in a 1.8 mL cartridge	20 kg × 7 mg/kg maximum = 140 mg maximum 140 mg maximum/36 mg per cartridge = 3.8 cartridges of 2% lidocaine with 1:100,000 epinephrine
20 kg patient (e.g. a 5-year-old) 4% articaine with 1:100,000 epinephrine in a 1.8 mL cartridge	20 kg × 7 mg/kg maximum = 140 mg maximum 140 mg maximum/72 mg per cartridge = 1.9 cartridges of 4% articaine with 1:100,000 epinephrine
60 kg patient (e.g. a 40-year-old) 2% lidocaine with 1:100,000 epinephrine in a 1.8 mL cartridge	60 kg × 7 mg/kg maximum = 420 mg maximum 420 mg maximum/36 mg per cartridge = 11.6 cartridges of 2% lidocaine with 1:100,000 epinephrine
100 kg patient	100 kg × 7 mg/kg maximum = 700 mg maximum
2% lidocaine with 1:100,000 epinephrine in a 1.8 mL cartridge	BUT reported maximum is 500 mg 500 mg maximum/36 mg per cartridge = 13.8 cartridges of 2% lidocaine with 1:100,000 epinephrine