This high-yield revision note on Local Anesthetic Dose Calculation Formula - Easy Trick for All Exams covers everything examiners typically test under Pharmacology — structured as quick-reference tables, clinical correlations, mnemonics and previous-year-style high-yield points. It's built for last-mile revision before NEET MDS, INI-CET MDS and INBDE, so you can scan it in minutes instead of re-reading a whole textbook chapter.
| Step | Formula/Action | Example (2% Lignocaine, 70kg adult) |
|---|---|---|
| Step 1 - Find mg/ml of the solution | % concentration × 10 = mg/ml | 2% × 10 = 20 mg/ml |
| Step 2 - Find mg per cartridge | mg/ml × cartridge volume (usually 1.8ml) | 20 mg/ml × 1.8ml = 36 mg per cartridge |
| Step 3 - Find Maximum Safe Dose (MSD) for the patient | Max recommended dose (mg/kg) × patient weight (kg) | 4.4 mg/kg × 70kg = 308 mg (capped at the drug's absolute maximum, e.g. 300-500mg depending on source/vasoconstrictor use) |
| Step 4 - Find maximum number of cartridges | MSD (mg) ÷ mg per cartridge | 300 mg ÷ 36 mg = 8.3 → 8 cartridges maximum |
| Additional check - Vasoconstrictor dose | Epinephrine 1:100,000 = 0.01 mg/ml; multiply by volume used to ensure total epinephrine stays under the safe limit (0.2mg in a healthy adult, 0.04mg in a significant cardiac patient) | 8 cartridges × 1.8ml × 0.01mg/ml = 0.144mg epinephrine - within the healthy-adult limit of 0.2mg |
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