You think you have been bitten by a poisonous spider or scorpion.
You experience any of the symptoms of anaphylactic shock described above. This is a severe, possibly life-threatening condition.
Call 911 or your emergency number immediately.
If you experience any sign of anaphylaxis and have epinephrine available, do not hesitate to use it, even if you are unsure that your symptoms are allergy related. Using an auto-injector pen as a precaution will not harm you.