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SedationLog

Local anesthetic toxicity calculator

The same math the SedationLog app uses, free and without a login. Enter the patient's details and the local anesthetic given; the AAPD and manufacturer percentages update as you type.

Nothing you type is saved. All data clears when you close the tab or press "Delete calculations."

For educational decision support only. This calculator does not provide clinical or dosing advice and does not replace your professional judgment. Maximum-dose guidance varies by source and patient; verify against the manufacturer's label and current guidelines. The treating clinician is solely responsible for all dosing decisions.

Patient

Date of birth
Sex at birth
Used for the ideal-body-weight formula.
Height
Weight
Optional. When the measured weight is below ideal body weight, the lower value is used as the dose ceiling.

Local anesthetics given

Recorded doses

    No doses recorded yet. Percentages from different drugs add together.

    Cumulative toxicity

    Enter date of birth, height, sex, and record at least one local anesthetic dose to see results.

    How is this calculated?

    The percentage is the dose given as a fraction of the patient's maximum allowable dose: percent = total mg ÷ (max mg/kg × ideal body weight) × 100 , capped so it never exceeds the drug's absolute mg ceiling.

    Ideal body weight (IBW)

    The denominator is the lower of ideal body weight and the patient's measured weight (when you enter one). Ideal body weight keeps a heavier patient from being dosed toward an overdose; the measured-weight floor protects a tall but underweight patient whose true lean mass is below ideal.

    • Adults (18+): Devine formula. Male = 50 kg + 2.3 × (height in inches − 60); female = 45.5 kg + 2.3 × (height in inches − 60). Intersex or unknown/unspecified sex uses the female formula, the more conservative of the two.
    • Children (< 18): 50th-percentile BMI-for-age × height², using a standard BMI-for-age reference.

    Two ceilings

    Each drug is scored against both the conservative AAPD pediatric limit and the manufacturer (adult) label, because they differ in dentistry. Both percentages are shown so you can see where each line sits.

    Multiple anesthetics

    Amide local anesthetics share a common toxicity pool, so their individual percentages add linearly into the totals (per FDA / Stoelting).

    Note on time

    The full SedationLog app also decays each dose by its half-life over the course of a case. This quick calculator has no case timeline, so it treats every dose as currently on board — the conservative "all of this at once" figure.