Anaphylactic / Allergic shock is caused whenever the heart is unable to pump enough blood throughout the body due to an allergic reaction, weakening of the heart muscle, or shrinking of the veins (vasodilation). Injection of epinephrine into the blood stream will cause an increase of blood flow throughout the body. While epinephrine/ adrenaline does increase aortic, cerebral, and carotid circulation pressure, it lowers carotid blood flow and end-tidal CO2 or ETCO2 levels which may lower seizure threshold. Its one of the reason many video games and action movies have seizure warning because when we are excited adrenaline is released from Adrenal grands that results lower seizure threshold. Strong emotions such as fear or anger cause epinephrine to be released into the bloodstream, which causes an increase in heart rate, muscle strength, blood pressure, and sugar metabolism. This reaction, known as the “Flight or Fight Response” prepares the body for strenuous activity. Many patients had adverse reaction which which have warranted action by the FDA to attempt to ban this drug.