Poisons and (Really Bad) Antidotes

My family doctor has this chart on the wall of one of his examining rooms, one of an interesting collection of old medical artifacts.

I’m deeply suspicious that the cure for cannibis poisoning includes strychnine, itself a poison that is “a highly toxic, colorless, bitter, crystalline alkaloid used as a pesticide, particularly for killing small vertebrates such as birds and rodents.”

That seems like a trick.