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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...

Analgesia and Pain Management

Analgesia and Pain Management

Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...

Opioid Analgesics: Synthetic and Semisynthetic Opioids

Opioid Analgesics: Synthetic and Semisynthetic Opioids

Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...

Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia

Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia

Depending on the target organ, local anesthetics (LAs) can be administered via various routes. In surface anesthesia, LAs are applied directly to the surface of the skin or mucous membranes. It is widely used for topical skin numbing before venipuncture or minor surgical procedures. Commonly used surface local anesthetics are lidocaine or benzocaine sprays or creams. Surface anesthesia occurs within 5 minutes and lasts for about 60 minutes. One of the main disadvantages of topical anesthesia is...

Local Anesthetics: Clinical Application as Epidural Anesthesia

Local Anesthetics: Clinical Application as Epidural Anesthesia

Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...

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...

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Related Experiment Video

Updated: Jul 18, 2026

A Modified Inflammatory Pain Model to Study the Analgesic Effect in Mice

A Modified Inflammatory Pain Model to Study the Analgesic Effect in Mice

Published on: November 15, 2024

Topical analgesics.

Gary McCleane¹

¹Rampark Pain Centre, 2 Rampark Dromore Road, Lurgan BT66 7JH, Northern Ireland, UK. gary@mccleane.freeserve.co.uk

The Medical Clinics of North America

|December 14, 2006

Summary

Topical pain relief offers a promising approach by targeting peripheral pain sites directly. This method aims for high drug concentrations locally, minimizing systemic side effects for better patient outcomes.

Area of Science:

Pharmacology
Pain Management
Drug Delivery Systems

Background:

Increasing understanding of pain pathophysiology.
Limitations of systemic pain medication, including side effects.
Potential for localized drug delivery to peripheral targets.

Purpose of the Study:

To highlight the benefits of targeting peripheral pain mechanisms.
To explore the potential of topical agents in pain management.
To emphasize the advantages of localized drug delivery over systemic administration.

Main Methods:

Review of current knowledge on pain pathophysiology.
Analysis of systemic versus topical drug delivery for pain.
Evaluation of existing and potential topical agents for pain relief.

Related Experiment Videos

Last Updated: Jul 18, 2026

A Modified Inflammatory Pain Model to Study the Analgesic Effect in Mice

A Modified Inflammatory Pain Model to Study the Analgesic Effect in Mice

Published on: November 15, 2024

Main Results:

Topical agents can deliver high drug concentrations at peripheral sites.
Localized treatment can minimize systemic drug exposure and side effects.
Evidence suggests efficacy for several available topical agents, with more anticipated.

Conclusions:

Peripheral targeting of pain remains a valuable strategy.
Topical drug delivery presents a favorable risk-benefit profile for pain management.
Further development of topical agents is expected due to advancements in pain science.