PHOENIX -- The University of Arizona is testing a new antivenom called Anascorp.

Anascorp, produced in Mexico, is used to treat scorpion stings.

Since the clinical trial began in Arizona, almost 1,000 patients have seen results.

Among those is Kelly Robertson’s 5-year-old son Dylan.

Last month, a bark scorpion stung Dylan at his Grandma’s house.

A small bark scorpion’s venom contains nerve toxins, begin to cause neurological problems almost immediately in children.

“He couldn’t focus on anything, his eyes were twitching, and then they’d roll back in his head, and that was frightening,” said Robertson.

Dylan was rushed to the hospital and given the antivenom.

Robertson said within an hour of starting the IV, Dylan was back to his old self.

Anascorp only works on the dangerous bark scorpion.

Medical experts hope to have FDA approval for Anascorp by the end of the year.