Answer
It deliberately disrupts the nerve and interrupts pain-signal transmission, potentially producing prolonged or permanent pain relief and numbness.
Sources for this answer
- Dehydrated Alcohol (Absolute Alcohol) BP for Injection — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.