Local Anesthetic Toxicity Calculator

kg
%
mL
Health

Calculate safe dosing for local anesthetics and assess toxicity risk. Clinical reference tool for healthcare providers to ensure anesthetic doses remain within safe limits based on patient weight and agent used.

Formula

Max Dose = min(Weight × Agent Limit, Absolute Maximum); Safety Margin = (Max - Actual) ÷ Max × 100%
  • Lidocaine: 7 mg/kg (500mg with epinephrine, 350mg without)
  • Bupivacaine: 2.75 mg/kg (175mg max)
  • Prilocaine: 8 mg/kg (600mg max)

Lidocaine Infiltration

Inputs
  • Patient Weight (kg): 70 kg
  • Anesthetic Agent: lidocaine
  • Concentration (%): 1 %
  • Volume Administered (mL): 30 mL
  • Epinephrine Added: yes

70kg patient, 30mL 1% lidocaine with epinephrine = 300mg. Max 490mg. Safety margin 38.8% = SAFE.

Frequently asked questions

What if margin is negative?
Do NOT administer - dose exceeds safe limit. Toxicity risk (seizures, cardiac events). Consult anesthesia.