system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How (lethal) Drugs given for Euthanisia is/acts different from drugs given to a deathrow inmate?
gpt
Differences arise when drug companies \*do\* want to sell their drugs for use in sympathetic euthanasia procedures (typically for animals, since not that many countries allow it for humans) but don't want to sell it to various governments for use in killing healthy but criminal people. In fact it's actually illegal for companies in the EU to sell drugs for such a purpose. As such, these governments need to go to greater and greater extremes to acquire the drugs, a process which typically involves changing the cocktail to something they think will work based on whatever they can get their hands on. 

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In other words, whilst basically all animals are euthanised with Pentobarbital, there is no specific "drugs given to deathrow inmates". Oklahoma, especially, went through a period of repeatedly fucking up the drug cocktails they used, leading to people writhing around for 45 minutes before finally popping their clogs. They then screwed up the next one again, in an exciting, new way. Meanwhile, every day up and down the US (not to mention the rest of the world) thousands of animals are peacefully euthanised with barely any mishaps.