What is a common characteristic of all topical anesthetics?

Topical anesthetics are known for their rapid onset of action, which is a defining characteristic of these medications. They are designed to block nerve transmission and provide immediate sensation relief at the site of application. This quick action is crucial in clinical settings, particularly in procedures that require prompt anesthesia, such as minor surgeries or diagnostic tests.

While some topical anesthetics may be relatively non-toxic and can provide temporary pain relief, these factors can vary based on the specific agent used and its concentration. Furthermore, the presence of ester or amide linkages is specific to certain classes of anesthetics, and not all topical anesthetics contain ester linkages.

Long-lasting pain relief is also not a common feature of topical anesthetics; they are primarily intended for short-term use and localized effect rather than extended pain management. Therefore, the characteristic of acting quickly is consistently applicable to all topical anesthetics.