Question 14 of 35

Yes. 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.