Carbarsone is an organoarsenic compound used as an antiprotozoal drug for treatment of amebiasis and other infections.

Thereafter, it remained available as a turkey feed additive for increasing weight gain and controlling histomoniasis (blackhead disease).

[4][5] Carbarsone is one of four arsenical animal drugs approved by the U.S. Food and Drug Administration for use in poultry and/or swine, along with nitarsone, arsanilic acid, and roxarsone.

[6] In September 2013, the FDA announced that Zoetis and Fleming Laboratories would voluntarily withdraw current roxarsone, arsanilic acid, and carbarsone approvals, leaving only nitarsone approvals in place.

[7] In 2015 FDA withdrew the approval of using nitarsone in animal feeds.