π Local Anesthetic Max Dose Table
Weight-based ceilings for every common agent.
For informational purposes only, not medical advice. Dosing decisions must be confirmed with your doctor or pharmacist. Consult a healthcare professional.
Every local anesthetic has a weight-based maximum, and the numbers differ widely by agent. Short-acting agents like lidocaine allow 4.5 mg/kg plain and 7 with epinephrine; long-acting bupivacaine allows only 2 mg/kg plain because it binds cardiac sodium channels more stubbornly. Pick the agent and the calculator applies the right ceiling.
The table covers lidocaine, mepivacaine, prilocaine, bupivacaine, ropivacaine, and articaine, plain and with epinephrine. These are safety ceilings for trained clinicians, and most procedures use far less than the maximum.
How to Use This Calculator
Enter the patient's weight in kilograms, pick the agent, and indicate whether epinephrine is in the solution. Read the maximum milligrams for that agent. Remember the ceiling covers every injection site combined, and reduce ceilings when mixing two agents since toxicities add.
Enter weight in kg.
Pick the local anesthetic agent.
Select plain or with-epinephrine formulation.
Read the maximum mg and keep the total across all sites under it.
The Ceiling Table
Rate depends on agent and epinephrine
Maximum doses come from systemic toxicity thresholds established over decades: blood levels that produce seizures and cardiac collapse. Potency and cardiotoxicity set the ranking: bupivacaine's slow dissociation from cardiac sodium channels makes it the most dangerous in overdose, hence the lowest ceiling. Epinephrine raises ceilings for most agents by slowing vascular absorption, but not for ropivacaine or articaine in standard references, which keep single values. Prilocaine carries a special caution at high doses: methemoglobinemia. These are widely cited reference values; always confirm against your institution's formulary.
Worked Example
A 70 kg patient, plain bupivacaine: 140 mg maximum (2 mg/kg (plain)), far lower than lidocaine's 315 mg because bupivacaine is more potent and more cardiotoxic. Add epinephrine and it rises to 210 mg. Mixing agents? Toxicities add: reduce ceilings when mixing agents
Using the Table
Compare agents at a glance: articaine and lidocaine with epi share the highest ceilings, bupivacaine plain the lowest. In practice, choose the agent by needed duration (lidocaine 1-2 hours, bupivacaine 4-8), then dose to effect well under the ceiling. Elderly, debilitated, and cardiac patients deserve reduced ceilings, and highly vascular injection sites absorb faster. Early toxicity signs (tinnitus, perioral numbness, metallic taste) are the warning to stop and prepare intralipid rescue.
| Agent | Plain (mg/kg) | With epi (mg/kg) |
|---|---|---|
| Lidocaine | 4.5 | 7 |
| Mepivacaine | 4.5 | 7 |
| Prilocaine | 6 | 9 |
| Bupivacaine | 2 | 3 |
| Ropivacaine | 3 | 3 |
| Articaine | 7 | 7 |
Clinician Territory
Local anesthetic administration requires training, monitoring, and resuscitation readiness including intralipid. Never inject anesthetics without qualification, and never treat the ceiling as a target dose. Verify against your local formulary since references vary slightly. This tool is for informational purposes only, not medical advice. Dosing decisions must be confirmed with your doctor or pharmacist. Consult a healthcare professional.
Related tools: lidocaine max dose calculator and IV flow rate calculator.
For informational purposes only, not medical advice. Dosing decisions must be confirmed with your doctor or pharmacist. Consult a healthcare professional.
Frequently Asked Questions
What is the max dose of bupivacaine?
2 mg/kg plain, 3 mg/kg with epinephrine. For a 70 kg adult that is 140 mg plain.
Which local anesthetic lasts longest?
Bupivacaine and ropivacaine, typically 4 to 8 hours versus 1 to 2 for lidocaine. Duration guides agent choice more than the ceiling does.
Why is bupivacaine more dangerous in overdose?
It dissociates slowly from cardiac sodium channels, making arrhythmias harder to reverse. This is also why its ceiling is the lowest.
Can I combine lidocaine and bupivacaine?
Clinicians do for fast onset plus long duration, but toxicities add, so reduce each agent's maximum accordingly.
What is articaine used for?
Mostly dentistry. It has a high ceiling (7 mg/kg) and good bone penetration, making it popular for dental blocks.
Does epinephrine help all local anesthetics?
It raises the ceiling for lidocaine, mepivacaine, prilocaine, and bupivacaine. Standard references keep ropivacaine and articaine at single values.
What is methemoglobinemia with prilocaine?
High prilocaine doses can oxidize hemoglobin so it cannot carry oxygen, causing cyanosis unresponsive to oxygen. It is dose-related and treatable.
How do you treat local anesthetic toxicity?
Stop injection, support airway and circulation, treat seizures, and give intravenous lipid emulsion for severe systemic toxicity. Call for help early.
How do I pick between lidocaine, bupivacaine, and ropivacaine?
Match the drug to the job. Lidocaine starts fast (minutes) and lasts 1 to 2 hours, good for quick procedures. Bupivacaine starts slower but lasts 4 to 8 hours, good for longer cases and post-procedure pain. Ropivacaine is similar to bupivacaine with a slightly better cardiac safety margin. Mixing a fast and a long agent is common practice.
Does body weight or age change the maximum dose?
Use ideal or lean body weight in very heavy patients, since these drugs distribute poorly into fat, and total-body-weight dosing can overshoot. Elderly patients and those with liver disease clear amide anesthetics slowly, so stay well under the maximum and watch longer for delayed toxicity signs after the procedure.