Should be avoided, and education are the pillars of preventive treatment of people suffering from severe allergies. However, the allergen can not always be avoided, so it is important to know what emergency measures (eg, epinephrine auto-injection), which is the exposure. It is also important to be wary of re-allergic reaction in the first hour of the main reaction took place, also known as biphasic reaction.For certain allergy, immunotherapy to desensitize allergic patients after an allergic reaction.