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Local Anesthetics: Adverse Effects

Local Anesthetics: Adverse Effects

While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...

Local Anesthetics: Pharmacokinetics

Local Anesthetics: Pharmacokinetics

The potency and duration of action of local anesthetics (LAs) are determined by their pharmacokinetics. Pharmacokinetics describes how LAs are absorbed, distributed, metabolized, and eliminated from the body. When administered to the vascular tissues, LAs are quickly absorbed and enter the systemic circulation, reducing their localized effects. Adding vasoconstrictors such as epinephrine to LAs reduces their absorption into the systemic circulation, making them clinically effective. The...

Local Anesthetics: Chemistry and Structure-Activity Relationship

Local Anesthetics: Chemistry and Structure-Activity Relationship

Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...

Local Anesthetics: Common Agents and Their Applications

Local Anesthetics: Common Agents and Their Applications

Local anesthetics (LAs) are commonly used for various applications in medical and dental procedures. Some of the common agents used are cocaine, lidocaine, and bupivacaine.
Cocaine is an ester of benzoic acid and methylecgogine. It is used to anesthetize and vasoconstrict locally. Currently, it is used primarily for topical applications. It is beneficial for surgeries on the upper respiratory tract, providing anesthesia and shrinking the mucosa. Cocaine in the form of cocaine hydrochloride is...

Local Anesthetics: Differential Sensitivity of Nerve Fibers

Local Anesthetics: Differential Sensitivity of Nerve Fibers

Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...

Local Anesthetics: Mechanism of Action

Local Anesthetics: Mechanism of Action

Local anesthetics (LAs) block sensory and motor impulses by inhibiting the sodium channels on the nerve cell membranes. This induces temporary loss of sensation, relieving pain in a specific body area.
Local anesthetics are amphiphilic molecules consisting of a hydrophobic aromatic part linked to a hydrophilic group by an ester or amide linkage. They are weak bases and are usually available as salts, which increases their solubility and stability. Once administered, LAs exist in the body either...

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Related Experiment Video

Updated: Jun 14, 2026

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention

Published on: October 16, 2013

Local anaesthetic toxicity.

Anthony J Maher¹, Stuart A Metcalfe, Steve Parr

¹Department of Podiatric Surgery, Solihull Care Trust, chelmsley Wood Primary Care Centre, Crabtree Drive, Chelmsley Wood, Birmingham B375BU, United Kingdom. anthony maher79@yahoo.co.uk

Foot (Edinburgh, Scotland)

|March 24, 2010

Summary

This summary is machine-generated.

Local anaesthesia is essential for podiatric surgery but carries risks of toxicity. Prompt recognition and management, potentially with Intralipid, are crucial to minimize harm from adverse reactions.

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Last Updated: Jun 14, 2026

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Area of Science:

Podiatric Medicine
Anesthesiology

Background:

Local anaesthesia has been integral to British podiatry since the 1960s.
Its use has expanded the scope of practice and enabled podiatric surgery.
However, local anaesthesia carries inherent risks, including potential toxicity and adverse reactions.

Purpose of the Study:

To comprehensively review existing literature on local anaesthetic toxicity.
To examine contemporary advancements in managing acute toxic events.

Main Methods:

Literature review of scientific articles and clinical reports.
Analysis of case studies and treatment guidelines for local anaesthetic toxicity.

Main Results:

Local anaesthesia, while generally safe, can lead to severe complications if toxicity occurs.
Effective management strategies are vital to mitigate the consequences of adverse reactions.
Intralipid has emerged as a potential resuscitation agent for managing systemic toxicity.

Conclusions:

While safe when administered correctly, local anaesthesia necessitates vigilance regarding potential toxicity.
Proactive measures to prevent toxicity and prompt, effective interventions are paramount.
The use of Intralipid represents a significant development in managing local anaesthetic systemic toxicity (LAST).