vice versa

> Ethanol is the most commonly used antidote to block the metabolising of methanol. Ethanol works by competing with the metabolic breakdown of methanol, thereby preventing the accumulation of toxic byproducts.

MSF: https://methanolpoisoning.msf.org/en/for-health-professional...

I can see the ambiguity of my comment. I was trying to phrase as a riddle but can be interpreted both ways.