I guess I'm being too rigid here, but for possibly venomous snakebite I'll stick to the current best medical recommendations supported by current medical science. It's too important (for me) to resort to homeopathic or folk remedies unless there is some serious science behind them. Looking at the citations in these references, I remain unconvinced:

Charcoal Remedies by John Dinsley:
How Can Charcoal Be Used On Snakebites?
For snakebites, charcoal adsorbs the hemolytic substance of the snake venoms (one that destroys red blood cells). Only about 25% of poisonous snakes bites are venomous. Swelling begins within 10 minutes. If swelling occurs then venom has entered the body. Immediately after a bite submerge the area in cool charcoal water for about 30 minutes to one hour, with one half cup of charcoal to about two gallons of water. Cover the area with a large charcoal poultice and change every 10-15 minutes until swelling and pain are gone. Take charcoal by mouth as well. Take about 2 large tablespoons in a half glass of water every 2 hours for 3 doses. Take one small spoonful every 4 hours for the next 24 hours. Each charcoal dose should be followed by 2 glasses of water.
This remedy should work fine in 75% of snakebites. Otherwise, someone please educate me - how does topical charcoal (in the soak, or in the poultice) catch up with and "neutralize" venom in the lymphatic or venous system. I can't figure it out. And then... how was orally ingested charcoal survive digestion and then overtake the venom in the lymphatic or venous system. Perhaps one of our MD or Paramedic ETS'ers can help me understand this.

And while you're at it... from the same book:
How Is Charcoal Used For Viruses?
The sheep pox and foot and mouth virus and the anthrax virus are adsorbed by charcoal.

How does charcoal get to the intracellular virus? Assuming the authors really meant "adsorb" and not "absorb"..."Absorb" refers to a situation where something is taken into a medium, and disappears as a consequence (from?). "Adsorb" refers to a situation where something gets stuck onto (to?) the surface of a medium. I guess if I suspected a surface was contaminated with anthrax I wouldn't balk at dusting it with activated charcoal. But the next time I get anthrax I'll probably opt for more traditional approaches.

I admit I'm being sarcastic... and I'm not trying to "dis" anyone here. But (back on the point of the thread) in a survival situation I'm going to start with actions having a high probability of success...then probably will devolve down the probability chain even to the point of trying almost anything. I consider the above remedies in life-threatening situations to be the later, not the former. But YMMV.