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“Antivenins have existed for decades, of course, but they are expensive, potentially dangerous and used only rarely in poor countries. The medicines contain antibodies harvested from the blood of sheep or horses that have been injected with diluted venom and allowed to recover.”
https://www.nytimes.com/2018/10/12/health/snakebites-treatments-nanoparticles.html?action=click&module=Discovery&pgtype=Homepage

Tiny Nanoparticles to Treat a Huge Problem: SnakebitesSnakes kill or cripple 500,000 people a year, but antivenins are costly and rare in poor countries. Now scientists are testing injectable nanoparticles that neutralize venom.