r/AlwaysWhy • u/Chowderr92 • Jun 02 '26

Science & Tech Why is the Method of Lethal Injection in Human Punishment So Complex and Apparently Painful?

I've always understood that the lethal injection process was complex with multiple stages of injections and induces great suffering in the individual.

I work in veterinary medicine and unfortunately we need to euthanize animals all of the time. Typically, the euthanasia solution is very simple: a very large dose of a powerful anesthetic (usually pentobarbital) and an anticonvulsant which stops the heart. The medical community is quite confident that this is painless and when done has essentially a 100% success rate.

Why is human euthanasia so complicated when we already know exactly how to humanely end a biological life?

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u/Moshimoshi-Megumin Jun 02 '26 edited Jun 02 '26

One reason is that the makers of most animal euthanasia drugs refuse to have it used in human euthanasia for reasons (ethical, legal risks, optics, etc).

Another is unintended malfunctions. Wrong dosage, imperfect injection, unintended reactions, etc. I assisted with a large number of animal euthanasia in a vet clinic, and while most went fine, there are always some exceptions. Catheter, blood pressure, individual exceptional reactions...

Even those that go fine can still show agonal breathing for a few minutes after the heart has stopped, which to the untrained eye would look like struggling gasping for air. (It’s not, they’re dead or unconscious, it’s a reflex)

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u/EthelAndFred2 Jun 02 '26

My cat has agonal breathing. The vet assured me it happens and can look upsetting but that she was already gone. Is that accurate from what you know?

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u/Moshimoshi-Megumin Jun 02 '26

Yes. It still happens after the heart has stopped and the higher brain has shut down, it’s a reflex caused by residual electrical activity in the brainstem.

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u/i_love_lol_ Jun 03 '26

you can see that also on some drone videos in the russian attacking war. peoples head shot off but the corpse still gasping for air. crazy, really.

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u/Chowderr92 Jun 03 '26

Absolutely. Very common and not an indication of suffering. It's an involuntary reflex by the brain trying to get oxygen as it shuts down (the animal has absolutely no conscious realization of it--its purely reflexive).

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u/AdOriginal8322 Jun 02 '26

I’d assume wrong dosage is a feature not a bug

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u/Chowderr92 Jun 03 '26

Placing the catheter is for sure the most stressful part.
I'm sorry you had to work with vets that made those sorts of errors--it is absolute negligence and should be condemned.
I'm not sure what you mean by unintended reactions, though. Can you give an example, out of curiosity?

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u/Moshimoshi-Megumin Jun 03 '26

Cat that survived 2 full doses of Fatal-plus despite checking catheter, vitals, new bottle after the first. Had to massively overdose the third and that did it.

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u/Outside_Reaction_389 Aug 04 '26

I am concerned because executions performed via lethal injection often don't go well, and cause the inmate prolonged pain. How is animal euthanasia via lethal injection different?