Lidocaine HCl 5mg/mL with epinephrine 1:200000 ... epinephrine may serve as a warning of unintentional intravascular inj. For all procedures: max dose: 7mg/kg, not to exceed 500mg.

Lidocaine HCl 10mg/mL with epinephrine 1:200000 ... epinephrine may serve as a warning of unintentional intravascular inj. For all procedures: max dose: 7mg/kg, not to exceed 500mg.

After an injection, lidocaine's effects last an hour or two. Bupivacaine is long-acting, with effects lasting from two to four hours or more. Several factors affect how long these medicines work.