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Benzocaine is a unique local anesthetic because it does notcontain a tertiary amine. The pKa of the aromatic amine is 3.5ensuring that benzocaine is uncharged at physiological pH.Because it is uncharged, it is not water soluble but is ideal fortopical applications. The onset of action is within 30 secondsand the duration of drug action is 10 to 15 minutes.
Applications and usese:
A commonly used topical pain reliever. Main active ingredient in anesthetic ointment and UV absorption of cosmetics, local anesthetics.