
Toxic side effects of local anaesthetic drugs occur when excessive blood levels occur.
Found on
http://www.encyclo.co.uk/local/20902

Agents that are capable of inducing a total or partial loss of sensation, especially tactile sensation and pain. They may act to induce general anaesthesia, in which an unconscious state is achieved, or may act locally to induce numbness or lack of sensation at a targeted site. ... (12 Dec 1998) ...
Found on
http://www.encyclo.co.uk/local/20973

Anaesthetics are medical agents employed for the removal of pain, especially in surgical operations, by suspending sensibility either locally or generally. Various agents have been employed for both of these purposes from the earliest times, but the scientific use of anaesthetics may be said to date from 1800, when Sir Humphry Davy made experiments...
Found on
http://www.probertencyclopaedia.com/browse/EA.HTM
No exact match found.