Maximum Safe Dose of Lidocaine for Wound Infiltration

Adult Dosing Guidelines

The recommended maximum lidocaine dose for wound infiltration in adults is 4.5 mg/kg (≈300 mg total) without epinephrine and 7 mg/kg (≈500 mg total) with epinephrine. 1
For adult patients, the dose limit of 4.5 mg/kg without epinephrine and 7 mg/kg with epinephrine should be strictly observed to avoid systemic toxicity. 1

In children older than 3 years, the maximum lidocaine dose with epinephrine is 3.0–4.5 mg/kg. 1
For infants younger than 6 months, amide local‑anesthetic doses should be reduced by 30 % compared with older children. 1
For topical lidocaine‑epinephrine‑tetracaine (LET) formulations:
- 0.175 mL/kg is the maximum volume for children weighing < 17 kg. [2][3]
- 3 mL is the absolute maximum volume for children weighing ≥ 17 kg. [2][3]

Calculate the maximum allowable lidocaine dose (mg/kg) before injection to prevent overdose. 1
Concentration reference: 1 % lidocaine = 10 mg/mL; 2 % lidocaine = 20 mg/mL. 1

Buffer lidocaine with sodium bicarbonate (approximately a 1:9 or 1:10 lidocaine‑to‑bicarbonate ratio) to lessen injection pain. [2][3]
Warm the lidocaine solution before administration to improve patient comfort. [2][3]
Use small‑gauge needles (27–30 G) to minimize tissue trauma and pain. [2][3]

Seizures induced by lidocaine toxicity should be treated with benzodiazepines, and propofol should be avoided if the patient has cardiovascular instability. 1
Cardiovascular collapse requires immediate treatment with lipid emulsion therapy: a bolus of 1.5 mL/kg of 20 % lipid emulsion. 1

When repeat dosing is needed for continuous techniques, wait at least 90 minutes between doses to reduce cumulative toxicity risk. 1
In highly vascular anatomical areas, use lower lidocaine doses because systemic absorption occurs more rapidly. 1

Never exceed 4.5 mg/kg without epinephrine or 7 mg/kg with epinephrine in adult patients. 1
Always reduce lidocaine doses by 30 % in infants under 6 months to account for their increased susceptibility to toxicity. 1

For a 70 kg adult undergoing local infiltration anesthesia, the maximum safe dose is 315 mg (15.75 mL) of lignocaine 2% without adrenaline, or 490 mg (24.5 mL) of lignocaine 2% with adrenaline, according to the American Academy of Dermatology 4
The maximum dose of lignocaine 2% without adrenaline is 4.5 mg/kg, and with adrenaline is 7.0 mg/kg, for a 70 kg adult, resulting in 315 mg and 490 mg total doses, respectively 4
The volume of 2% lignocaine solution can be calculated as 315 mg ÷ 20 mg/mL = 15.75 mL without adrenaline, and 490 mg ÷ 20 mg/mL = 24.5 mL with adrenaline 4

Adding adrenaline to lignocaine provides significant clinical benefits, including prolonging the duration of anesthesia by approximately 200%, slowing systemic absorption, and improving surgical field visualization through vasoconstriction 5
Standard concentrations of adrenaline used are 1:100,000 or 1:200,000, which can help minimize cardiovascular effects in patients with cardiac disease 6

The American Academy of Dermatology recommends using the lowest effective dose, aspirating before each injection, using incremental injections, and continuously monitoring the patient for early toxicity signs, such as circumoral numbness, facial tingling, slurred speech, and metallic taste 4
Patients should be monitored for toxicity signs, and the use of incremental injections rather than bolus administration can help reduce the risk of toxicity 4

Pediatric patients require reduced doses, with a maximum of 1.5-2.0 mg/kg without adrenaline and 3.0-4.5 mg/kg with adrenaline, according to the American Academy of Dermatology and Praxis Medical Insights 4, 6

For procedures requiring multiple injections over time, a maximum of 500 mg lignocaine delivered over several hours is acceptable, with at least 90 minutes between repeat dosing for continuous techniques, as recommended by the American Academy of Dermatology and Praxis Medical Insights 4, 6