The effect this Venom has on the human body is that once it enters the body, it completely destroys the immune system making the uses vulnerable to some of the most simplest bacteria, viruses, etc that the body usually fights off. Then after the immune system is completely destroyed, it moves to the nervous system and muscles. It doesn't destroy the nervous system, just renders it useless for an hour, meaning that the person has complete paralysis all over the body. Then exactly after that hour, it destroys the muscles around the body, at this point its too late the save the person because it rapidly destroys the muscles and some muscles are needed to live. The only way Joshin can use it in its venom state is if the venom's acidic properties are reduced and somehow digested. Or he directly