Fair call. So much of this stuff is simplified for us laypeople, but yeah - when you look up what so-and-so molecule does and find out how many different binding sites it interacts with as an agonist/antagonist/catlyst (and sometimes they've only measured interactions in rats) you realise there's a heck of a lot of stuff going on.

I also got slightly weirded out when I found out something I was taking interacted with the mu-opiod receptors even though it wasn't an opiate.

Yeah, we have all these nice labels for all sorts of things, which makes it sound like everything is figured out, but this is definitely very far from the truth and complexity.