The hypothesis of developing something like PSP after consumption of a mitochondrial inhibitor is plausible, but in reality metformin is not strong enough to ca

The hypothesis of developing something like PSP after consumption of a mitochondrial inhibitor is plausible, but in reality metformin is not strong enough to cause such damages. Before something like that even starts to develop, a person who consumed the substance would feel a pronounced air hunger. Which does not happen with metformin, indicating that it is too mild to lead to negative consequences like that. Cyanide, on the other hand, is a strong mitochondrial inhibitor and it causes serious consequences (neurological, metabolical) including death.