As an antidote to poison, an old remedy suggested stirring a heaped teaspoonful of common salt and one of ground mustard into a glass of warm water. This was swallowed quickly to induce
vomiting. After the vomiting stopped, the person affected was supposed to swallow the whites of two eggs and then drink plenty of strong coffee.
Plantain was commonly used in folk medicine as a general antidote to poison, as was larch. Egg white beaten in milk was also used as an antidote, as was Castor oil.
The Romans used lemons as an antidote to all poisons, and early herbalists regarded avens as an antidote.