Some patients develop a sensitivity to anti-venom. However, there is a common myth that you cannot have anti-venom more than once. It is totally false. If you do develop a sensitivity and have a reaction from a subsequent administration of anti-venom, that reaction is very easily managed in a hospital setting.

Addressing your comment below, anti-venom does not provide much if any lasting benefit. Snakebite vaccinations have not shown effective in humans or pets. First, the venom antibodies are relatively short-lived. Second, vaccinations work well when your immune system gets to have a fair foot race with an incubating infection. Snake bites don’t work that way. You can be delivered a lethal dose in half a second. No amount of vaccination can prep your body to catch up with a sudden envenomation.