For a topical anesthetic ointment to have optimum effectiveness, it must remain on the site of injection for 1 to 2 minutes.
The length of the action is roughly 15 minutes, with the highest efficacy happening at 5 minutes after the action begins. Despite having a strength comparable to 20% benzocaine, 5% ointments take longer to start working and at least 3 minutes to provide sufficient anaesthesia.
The skin or mucous membranes, such as the inside of your mouth, nose, or throat, are immediately treated with topical anaesthetics. The surface of your eye can also be treated with them. Liquids are the most common form of topical anaesthetics.
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