Local Anesthetic Max Dose Calculator
Weight-based maximum dose limits for 7 local anesthetics — lidocaine, bupivacaine, ropivacaine, mepivacaine, prilocaine, articaine and chloroprocaine — with or without epinephrine. Results in mg, mL, and dental cartridges.
Calculator
Maximum dose estimate
- Agent & formulation
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- Limit applied
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- Solution strength
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- Absolute ceiling
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Reference table — published maximums
| Agent | Plain | + Epi | Ceiling |
|---|---|---|---|
| Lidocaine | 4.5 mg/kg | 7 mg/kg | 300 / 500 mg |
| Bupivacaine | 2 mg/kg | 3 mg/kg | 175 / 225 mg |
| Chloroprocaine | 11 mg/kg | 14 mg/kg | 800 / 1,000 mg |
| Mepivacaine | 6.6 mg/kg | 6.6 mg/kg | 400 mg |
| Prilocaine | 8 mg/kg | 8 mg/kg | 600 mg |
| Ropivacaine | 3 mg/kg | 3 mg/kg | — (weight-based only) |
| Articaine | 7 mg/kg | 7 mg/kg | — (weight-based only) |
- Lidocaine: FDA-approved label via DailyMed — 4.5 mg/kg (300 mg total) plain; 7 mg/kg (500 mg total) with epinephrine, normal healthy adults.
- Bupivacaine: Marcaine FDA label — single doses up to 175 mg plain / 225 mg with epi 1:200,000; the 2 / 3 mg/kg figures are clinical convention (some tables list 2.5 mg/kg plain).
- Chloroprocaine: Nesacaine FDA label — 11 mg/kg (800 mg max) plain; 14 mg/kg (1,000 mg max) with epi 1:200,000.
- Mepivacaine: FDA dental label — up to 3 mg/lb (6.6 mg/kg), 400 mg ceiling per sitting; Carbocaine label notes 7 mg/kg is "not recommended except in exceptional circumstances."
- Prilocaine: Citanest FDA dental labels — 8 mg/kg under 150 lb; 600 mg at 150 lb and above. CDC notes methemoglobinemia risk above ~400 mg in adults.
- Ropivacaine: commonly cited upper limit 2–3 mg/kg (studied up to 3 mg/kg); the US Naropin label states no single adult mg/kg maximum. Epinephrine does not raise the published limit.
- Articaine: Septocaine FDA dental label — 7 mg/kg (no absolute ceiling stated).
How the calculation works
- Convert weight to kg if entered in pounds:
kg = lb × 0.45359237. - Weight-based dose:
mg = weight (kg) × limit (mg/kg)for the selected agent and epi choice. - Apply the absolute ceiling when the label states one:
max mg = min(weight-based mg, ceiling). - Convert concentration:
mg/mL = percent × 10(1% = 10 mg/mL). - Maximum volume:
max mL = max mg ÷ mg/mL; dental cartridges =⌊max mL ÷ 1.8⌋.
Frequently asked questions
How is the maximum local anesthetic dose calculated?
The maximum dose in milligrams is estimated by multiplying body weight in kilograms by the published per-kilogram limit (mg/kg) for the chosen agent, then applying the published absolute ceiling when one exists: max dose (mg) = min(weight in kg x mg/kg, absolute cap). The maximum volume is that dose divided by the solution strength (mg/mL). This tool uses limits from FDA product labels and standard references; it is an educational estimate only.
How do you convert a percentage concentration to mg/mL?
A 1% solution contains 1 gram per 100 mL, which equals 10 mg per mL. So mg/mL = percent x 10. For example, 2% lidocaine = 20 mg/mL, and 0.5% bupivacaine = 5 mg/mL.
What is the maximum dose of lidocaine with and without epinephrine?
Per the FDA-approved lidocaine label, the maximum recommended dose is 4.5 mg/kg (with a 300 mg total ceiling) without epinephrine, and 7 mg/kg (with a 500 mg total ceiling) with epinephrine, for normal healthy adults. Lower doses apply to children, elderly, or debilitated patients, and a qualified clinician must determine the actual dose.
Why does epinephrine raise the maximum dose for some agents but not others?
Vasoconstrictors slow systemic absorption, which raises the published limit for lidocaine, bupivacaine, and chloroprocaine. For ropivacaine, articaine, mepivacaine, and prilocaine the published maximums do not change with added vasoconstrictor — this calculator keeps the same limit and shows a note when that is the case.
What are the absolute maximum dose ceilings?
Published single-dose ceilings used here: lidocaine 300 mg plain / 500 mg with epi; bupivacaine 175 mg plain / 225 mg with epi; chloroprocaine 800 mg plain / 1,000 mg with epi; mepivacaine 400 mg; prilocaine 600 mg. Ropivacaine and articaine labels state no absolute ceiling, so only the weight-based limit applies — clinical judgment still governs.
Why is prilocaine limited to 600 mg, and what is methemoglobinemia?
The prilocaine label caps the dose at 600 mg for adults of 150 lb (70 kg) or more. Doses above about 400 mg have been associated with methemoglobinemia, a condition where hemoglobin cannot carry oxygen normally; it is more likely in very young patients and those with certain enzyme deficiencies. Dosing must be determined by a qualified clinician.
Can this calculator be used for children?
The calculator accepts any weight and applies the same published limits, but pediatric dosing is more complex — labels recommend reduced, individualized dosing for children (for example, specific pediatric maximums and cartridge guidance in dental labels). Pediatric patients should only be dosed by a qualified clinician; treat any result here as an educational estimate, not a recommendation.
What happens if two different local anesthetics are combined?
Toxicity is additive: the combined fraction of each agent's maximum should stay within the limit. This calculator evaluates one agent at a time, so it cannot assess mixtures — combining agents requires clinician judgment and dedicated cumulative-toxicity tracking, not this single-agent estimate.
What are the signs of local anesthetic systemic toxicity (LAST)?
Early signs can include numbness around the mouth, metallic taste, ringing in the ears, dizziness, or agitation, progressing to seizures, severe heart rhythm problems, or cardiac arrest. Any suspected toxicity is a medical emergency requiring immediate professional care. This information is educational and does not replace clinical training.
Why do different references list different maximum doses?
Labels, textbooks, and specialty references sometimes disagree (for example, some tables list bupivacaine plain as 2 vs 2.5 mg/kg, or mepivacaine as 4.5 vs 6.6 mg/kg). This calculator follows FDA product labels where they state explicit limits and notes the source for each agent in the reference table. Always confirm against the current product label and a qualified clinician.
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