[Allergic reactions to local anaesthetics].

Local anaesthetics (LA) are frequently used, but allergy to LA is very rare. It can only be verified in about 1% of the patients referred with suspected allergy. Reactions may be due to vasovagal or toxic reactions, allergies to additives or other products used during administration. Suspicion of allergy should be investigated to rule out or confirm allergy. In case of allergy to LA, search of a safe alternative ensures the patients future ability to receive LA treatment. The investigation method depends on, whether a type I- or type IV reaction is suspected.