Comment by Veserv

Because they almost certainly can not. They almost certainly have no idea what the consequences of their actions are as the drug company almost certainly did everything in their power to obscure, obfuscate, and downplay the risks as literally every company is legally allowed to do.

The principle at play here is “informed consent”. Unfortunately, modern society has little interest in the “informed” part which is why it is probably not a good idea to let people imbibe untested drugs even if they are giving “consent” unless they can demonstrate they are “informed”.