Hydrogen peroxide (perhydrol) has a local cauterizing effect. In case of contact with the skin, it becomes white, burns, and forms blisters. When ingested, a burn occurs to the mucous membrane of the digestive tract. Poisoning with concentrated (40%) solutions of hydrogen peroxide is especially dangerous, which can cause gas embolism in the vessels of the heart and brain.
Inhalation of hydrogen peroxide causes an irritant effect and can lead to the development of toxic pulmonary edema.
Treatment of poisoning with hydrogen peroxide is similar to treatment for poisoning with caustic alkalis. In case of inhalation poisoning, therapy is carried out as for chlorine poisoning.