Fortunately, the effects of some snake bites can be counteracted with antivenin.
The antidote for severe widow spider bites is a substance called antivenin, which contains antibodies taken from the blood serum of horses injected with spider venom.
An antivenin for brown spider bites exists as well, but it is not readily available in the United States.
Minor rattlesnake envenomations can be successfully treated without antivenin, as can copperhead and watermoccasin bites.
However, coral snake envenomations and the more dangerous rattlesnake envenomations require antivenin, sometimes in large amounts.