Cyanide has been well known from antiquity. Cyanide poisoning causes histotoxic hypoxia--inhibition of mitochondrial cytochrome oxidase with disruption of the ability of cells to use oxygen. The mortality rate is 95% within 30 minutes. Acute cyanide poisoning is mostly the result of attempted suicide, and because of the high doses typically employed it usually is lethal within minutes. Also acute cyanide poisoning leads to a very poor prognosis because medical personnel can't detect cyanide intoxication and so many hospital haven't antidote. We report two cases of cyanide poisoning which responded well to treatment with the Taylor cyanide antidote package.