Anaphylaxis is a medical emergency and requires immediate treatment. If you have your emergency medication, you are instructed in how to use them. If in doubt, always contact the emergency services (112 or 144 for Switzerland).
Anaphylaxis requires medical supervision after first application of emergency medication by the patient, thus always immediately contact the emergency services.
Once a serious allergic reaction (anaphylaxis) starts, the drug epinephrine is the only effective treatment. In Switzerland, the autoinjectors availabe are either EpiPen® or Jext®, in Germany Fastjekt®, Jext® or Emerade®.
Important: When should the autoinjector be given?
Allergists advise that the autoinjector is used with symptoms of the respiratory or cardiovascular systems (as instructed by your allergist). Furthermore, the autoinjector is also used in case of more severe reactions of both skin and gastrointestinal tract.
And, most importantly, the autoinjector is to be used with any ingestion of the allergen to which there is a known anaphylactic reaction. I.e. if you had anaphylactic reactions previously to peanuts, and notice that you just had a bite of a cookie containing peanut, inject the EpiPen, and call the ambulance immediately.
Hier eine detaillierte Erklärung dazu von AAAI:
You'll find an allergy action plan e.g. here: