Question 14 of 35

That response is incorrect. The correct answers are both lidicaine and dyclonine.

PABA is found in esters. Lidocaine is an amide, therefore it could be used for a patient with an allergy to esters. Dyclonine hydrochloride is a chemically unique topical anesthetic which is neither an ester or an amide. It is classified as a ketone and its brand name is Dyclone. Dyclone can be used for patients with known sensitivities to esters or amides.

It is poorly soluble in water, which results in a very low systemic toxicity, thus making it one of the safest topical anesthetics. Dyclone, however, has a slow onset of action - from two to ten minutes. The duration of anesthesia may last up to one hour. In dentistry, a 0.5% solution is used.