Very simple: get your local poison control center involved. Anywhere in the United States, 24 hours a day, you can reach your poison center by calling 800-222-1222. So can your ambulance crew, or your doctor. During the past 20 years, there have been serious shortages of antivenom for rattlesnake bite, coral snake bite, scorpion sting and black widow bite. There has never been a good supply of antivenom for exotic (meaning not native to the US) animals. But in all cases, poison control centers keep tabs on the supply. Poison centers have expert toxicologists who can advise your doctor, too; and in some places the experts will even visit you in the hospital.