The king cobra is highly poisonous. Its venom mainly contains neurotoxins, and also contains cardiotoxins. The toxins are composed of polypeptides and proteins.

At the time of the attack, after the snake venom is injected into the victim's body, the toxin will rapidly attack the central nervous system of the bitten person, causing severe pain, Visual impairment, dizziness, drowsiness, and paralysis; the injured will enter a state of shock due to the collapse of the cardiovascular system, and eventually die due to respiratory failure and weakened heartbeat. Clinical cases have shown that people who are bitten may also develop renal failure.

A bite from a king cobra can be quickly fatal. It can inject 200-500 mg of venom on average, and the maximum venom secretion can even reach 7ml. Bitten people often need large amounts of anti-venom to fight snake venom and stop the toxin from further damaging bodily functions. It is even said that the venom that a king cobra can inject can kill an adult Asian elephant within 3 hours.