[JulianMorrison]

When you get a blood clot, Warfarin that they give you for it is literally a vitamin K blocker.

[legerdemain]

Warfarin is also literally used as rat poison, with the same mechanism of action.

[mmastrac]

"The dose makes the poison."

Botox is a pretty powerful tool for doctors when applied locally in small quantities, but often fatal in Botulism. Water is necessary for life, but hyponatremia is a real thing.