Anaphylaxis in immunotherapy.

Although anaphylactic reactions resulting from immunotherapy rarely occur, when they do occur they can be life-threatening. The literature reveals more than 30 deaths attributed to immunotherapy but numerous reports of anaphylaxis. We reviewed a 5-year experience of immunotherapy in a University practice and their experience with systemic reactions is presented. More than 125,000 injections were given in this time period. Of the 550 patients receiving immunotherapy, 14% experienced anaphylactic reactions, the majority of which were mild.