<unk>  is a antidote that is FDA approved for the treatment of for sequential use with sodium nitrite for the treatment of acute cyanide poisoning that is judged to be life-threatening.   Common adverse reactions include hypotension, prolonged bleeding time.
Thiosulfate
Sodium monofluorophosphate
Sodium selenate
Calcium arsenate
Dichloroacetic acid
Ethacridine lactate
Magnesium peroxide
Antimony pentasulfide