system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can shots injected in your butt go anywhere, while other shots need a vein?

Wow, came back from class and the gym and this had way more replies than I expected! Thanks for all the input!
gpt
It's called an Intramuscular injection and it doesn't have to be in the ass. It is often in the shoulder or thigh, too. Basically a slower delivery method than an Intravenous injection. Used when you want the drug to hit slower.