Lidocaine Dose Calculator
Calculate lidocaine maximum-dose and volume conversions by weight with or without epinephrine as a reference worksheet.
Local Anesthetic Dosing Calculator
Estimate local anesthetic maximum dose and volume by agent, concentration, weight, and epinephrine use.
โ ๏ธ Reference Note: These dose limits are worksheet estimates. Absorption depends heavily on injection site, vascularity, technique, and patient comorbidity, so this page should not be used as a stand-alone administration or rescue protocol.
Maximum Doseโง
490 mg
7 mg/kg ร 70 kg
Maximum Volumeโง
49 mL of 1% solution
10 mg/mL concentration assumption
Onsetโง
2-5 min
Lower pKa generally means faster onset
Expected Durationโง
60-120 min
Worksheet uses the epinephrine-adjusted duration range
Toxicity Contextโง
> 5 ฮผg/mL
Approximate plasma context only; injection site and rate matter
Safety Reminderโง
Use this as a dose worksheet, not a rescue protocol
If toxicity is suspected, follow the local emergency and toxicology pathway immediately
Local Anesthetic Comparison
| Agent | Max (plain) | Max (+ epi) | Onset | Duration | Duration + epi |
|---|---|---|---|---|---|
| Lidocaine | 4.5 mg/kg | 7 mg/kg | 2-5 min | 30-60 min | 60-120 min |
| Bupivacaine | 2.5 mg/kg | 3 mg/kg | 5-15 min | 120-240 min | 180-480 min |
| Ropivacaine | 3 mg/kg | 3 mg/kg | 5-15 min | 120-360 min | 180-480 min |
| Mepivacaine | 4.4 mg/kg | 6.6 mg/kg | 3-5 min | 45-90 min | 60-180 min |
| Prilocaine | 6 mg/kg | 8 mg/kg | 5-10 min | 30-90 min | 60-180 min |
| Chloroprocaine | 11 mg/kg | 14 mg/kg | 1-3 min | 15-30 min | 30-45 min |
LAST Warning Signs
| System | Signs / Symptoms | Context |
|---|---|---|
| CNS (early) | Circumoral numbness, metallic taste, tinnitus, light-headedness | Early warning |
| CNS (progressive) | Slurred speech, muscle twitching, visual disturbance, agitation, seizures | Escalating concern |
| Cardiovascular | Bradycardia, hypotension, widened QRS, ventricular arrhythmia, collapse | Severe concern |
Planning notes, formulas, and examples
About the Local Anesthetic Dosing Calculator
Local anesthetic dosing depends on the drug, the concentration, body weight, and whether epinephrine is being used. This calculator estimates maximum dose and converts that limit into volume for the selected concentration.
It also keeps onset, duration, and toxicity-warning context in view so the page works as a dose worksheet rather than as a stand-alone administration or rescue protocol.
When This Page Helps
Having the maximum dose and the volume conversion in one place reduces the chance of exceeding a published limit when the calculation needs to be done quickly. The comparison table also makes it easier to see how agents differ in onset, duration, and dose ceiling.
How to Use the Inputs
- Enter body weight and select kg or lbs.
- Choose the anesthetic agent.
- Indicate whether epinephrine is being used.
- Enter the solution concentration percent.
- Add age and hepatic-function context if you want the worksheet adjustment applied.
- Review the maximum dose, volume, and agent comparison table.
Formula used
Maximum Dose (mg) = Max mg/kg ร weight (kg) ร hepatic factor ร age factor. Volume (mL) = dose (mg) รท concentration (mg/mL). Concentration conversion: X% solution = X ร 10 mg/mL.Example Calculation
Result: Max dose = 490 mg, max volume = 49 mL of 1% lidocaine with epinephrine
7 mg/kg ร 70 kg = 490 mg. At 1% (10 mg/mL), the worksheet maximum volume is 49 mL.
Tips & Best Practices
- Calculate before drawing up the solution rather than estimating by eye.
- Add together all local anesthetic sources if more than one injection or field is being used.
- Volume and mg are not interchangeable unless the concentration is clear.
- Treat toxicity thresholds as rough context, not as a guarantee of safety below a single number.
Why Volume Conversion Matters
Maximum dose references are usually published in mg/kg, but most clinicians handle local anesthetics in mL. Converting the selected concentration into mg/mL is the step that makes the worksheet practically useful.
Agent Differences
Shorter-acting agents such as lidocaine or chloroprocaine are often chosen for quick procedures, while longer-acting agents such as bupivacaine and ropivacaine are used when longer duration is desired. The page keeps those differences visible without turning the result into a procedural order set.
Limits of Published Maximum Doses
Published dose ceilings are broad reference values. Injection site, vascular uptake, block type, age, hepatic function, pregnancy, and inadvertent intravascular injection can all matter as much as the raw mg/kg number.
Sources & Methodology
Last updated:
Methodology
This worksheet converts the selected concentration into mg/mL, applies the agent-specific maximum-dose reference, and then converts that limit into a volume estimate. It is a planning aid for published dose references, not a toxicity-management protocol.
Sources
- Lidocaine HCl injection label (FDA) โ Official lidocaine maximum-dose reference and concentration context.
- Bupivacaine hydrochloride injection label (FDA) โ Official bupivacaine maximum-dose reference and concentration context.
- Checklist for Treatment of Local Anesthetic Systemic Toxicity (ASRA) โ Safety-context reference for local anesthetic toxicity recognition and response.
Frequently Asked Questions
Epinephrine slows local absorption in many use settings, which is why published maximum-dose references are often higher with epinephrine than without it.
No. Highly vascular sites can absorb anesthetic faster than subcutaneous infiltration sites, so the same dose can behave differently depending on location and technique.
Bupivacaine is generally regarded as the most cardiotoxic of the common amide local anesthetics, so its published maximum dose is lower than lidocaine or prilocaine.
No. Tumescent anesthesia uses very different dilution and absorption assumptions, so the worksheet here is not appropriate for that use case.
No. It is a maximum-dose worksheet only. If systemic toxicity is suspected, the response belongs in a live emergency or toxicology pathway.
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