Umbrella snakes are quite poisonous. The toxin of the umbrella snake acts on the neuromuscular junction, blocking nerve conduction, so that the striated muscle does not contract, and finally leads to respiratory paralysis. When bitten, it just feels drowsy and the wound is not painful.

After that, the local wound will be paralyzed and spread to the proximal end without swelling and blood stasis. There will be generalized muscle paralysis, blurred vision, drooping eyes and face, unclear speech, salivation, shallow and fast breathing, etc., until respiratory failure, and in severe cases, deep coma and no response to stimulation.