Answer: antivenin

AnswerCrossword Clue
ANTIVENINUrgent need after a bite, at times
ANTIVENINSnakebite medicine
antiveninan antitoxin countering esp snake venom also ANTIVENOM
antiveninAn antiserum containing antibodies against specific poisons, esp. those in the venom of snakes, spiders, and scorpions