system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is a "cocktail" of 3 drugs required to put someone to death when a pet is euthanized with and OD of anesthetic

Is the anesthetic considered cruel and not suitable for a human?
gpt
Mostly, it's considered unreliable.

In the cocktail, the first thing administered is an anesthetic, and it is more than enough to OD and kill. They use about 14 times the normal dose. Even without the other two parts, they wouldn't live. They are knocked out within seconds from this first drug.

Next is a paralytic (makes muscles stop working, like the ones used to breathe). Again, more than enough to kill is given.

Finally, a drug is introduced to stop the heart.

The final two are very unpleasant unless you are first knocked out, but they are sure-fire ways of killing. The anesthetic is a humane way to knock them out first, and will kill on it's own, but is not reliable enough to be used by itself.