* Allergy to amide-type anesthetics * Allergy to metabisulfites * Idiopathic or congenital methemoglobinemia (not a concern in dental practice due to the small volumes of<unk>  used) * Hemoglobinopathy, such as sickle cell disease<unk>  is not contraindicated in patients with sulfa allergies, as there is no cross-allergenicity between<unk> 's sulphur-bearing thiophene ring and sulfonamides. Methylparaben is no longer present in any dental local anesthetic formula available in North America.
Articaine
Procaine
Tetracaine
Bupivacaine
Iontocaine
Levobupivacaine
Methitural
Ropivacaine