ANTIDOTE

[noun] [C] - a chemical, esp. a drug, which limits the effects of a poison, or (figurative) a way of preventing or acting against something badSales of nerve gas antidotes increased dramatically before the war.Anemone was at the time believed to be an antidote for scorpion poison.(figurative) Regular exercise is the best antidote to tiredness and depression.(figurative) High interest rates are the only known antidote to a persistent consumer boom.