What's the difference b/w antidote for a poison & its DOC?

What’s the difference b/w antidote for a poison & its DOC?
Like for cyanide, doc is amyl nitrate & antidote is hydroxycobalamine?

Antidote is like neutralizer of poison given as early possible to save life… .doc is like a treatmnet of poisoning symptoms… in few case antidote is also doc… . My explanation is very generalised and just bare minimum…plesse consult ur teachers for detailed explanation