Ketracel-white (YrB2CF3H2Au {primary structure} or simply White) was a extremely psycoactive narcotic used by the Founders to ensure the taut and barbaric loyalty of the Jem'Hadar.
Ketracel-white was produced in the Alpha quadrant until 2379, when the Son'a were forced by Starfleet Command to stop producing it.
The Dominion was believed to continue using Ketracel-White far after the Dominion War had ended.