A drug for heavy metal poisoning may double as a snakebite treatment

The drug can block proteins that are found in the venom of many vipers around the world

A snake called a puff adder hangs from it's tail with it's mouth open

Researchers are investigating whether a drug used for heavy metal poisoning might prevent harm to people from the venom of the puff adder, shown here, and other vipers. The snakes’ venom contains proteins that need zinc to do their damaging work.

Michele D'Amico supersky77/Getty Images

An old drug may find new use as a speedy treatment for venomous snakebites.