Not all venom is the same. I'd love to see your source document (or a pointer to it), becuase the treatment for a nerve agent (shuts down and shorts out the nervous system) is very different from a necrotic agent (it eats tissue, basically digestive juices) from a blood agent (stops oxygen from being properly carried by the blood) from a paralytic agent (you are aware of everything as your muscles fall asleep, including the diaphram and/or heart). The only time that I can think of a shock being any good is the last case, where if you keep the heart and lungs going, eventually the body metabolises the toxin. In every other case, I can think of how it would do harm, but not help.