Symbiote poison

The symbiote poison is a poison designed to attack Goa'uld and Tok'ra symbiotes. Composed of two liquids, when mixed together, they cause almost instantaneous death to the symbiote. While not fatal outright to the host, the dying symbiote will automatically release a toxin into their host, killing it. The Tok'ra developed it to attack the System Lords while the Goa'uld Empire was in chaos following the deaths of Apophis and Cronus, but they were forced to abandon it when they learned that Anubis was alive. Later, the Trust used it to attack Goa'uld worlds by firing missles filled with the gas through the Stargate, which they had recently stolen. SG-1 was able to reacquire the Stargate, but the al'kesh it was on fled to hyperspace, taking the symbiote poison with it.