Agent	Drug class	Concentration (%)	Onset	Duration*	Maximum dose (mg per kg)
Lidocaine (Xylocaine)	Amide	1	Rapid	30 to 60 minutes	4
Mepivacaine (Carbocaine)	Amide	1	Moderate	45 minutes to 1.5 hours	4
Bupivacaine (Marcaine)	Amide	0.25	Slow	2 to 4 hours	3
Procaine (Novocain)	Ester	1.0 to 2.0	Slow	15 to 60 minutes	7
Tetracaine (Pontocaine)	Ester	0.25	Slow	2 to 3 hours	1.5
Chloroprocaine (Nesacaine)	Ester	2	Slow	30 minutes	6 to 7