D

Tetracaine is an ester local-anesthetic that is several times more potent than other agents and is routinely chosen when a strong topical effect is required; studies comparing topical mixtures consistently show superior or equal analgesia when tetracaine is included versus benzocaine or prilocaine formulations [Gahalaut, 2014, PMID 24600520; Eidelman, 2005, PMID 15809126].