An antidote was used to counteract the effects of poisonous substances.
After the Tenth Doctor was poisoned by Arnold Golightly with cyanide, he improvised an antidote. It consisted of drinking ginger beer, eating walnuts for protein and anchovies for salt, and then getting a shock - a kiss from Donna Noble. This allowed him to eject the cyanide from his body through his mouth in a gaseous form. (TV: The Unicorn and the Wasp)