For example sodium thiosulfate, which acts as being a sulfur donor on the endogenous rhodanese enzyme that detoxifies cyanide by changing it to thiocyanate An antidotal blend of inhaled amyl nitrate and intravenous sodium nitrite and sodium thiosulfate are sometimes indicated. The IPCS/CEC (1993) overview of antidotes for cyanide poisoning https://cyanolab.net/potassium-cyanide/