u/inuitt

there’s many different medications like hydrocodone, oxycodone, codeine, morphine, fentanyl, etc…but they seem to all just be derivatives of opium. what’s the difference, objectively and subjectively? I have tried a few different types though it’s been years, from what I remember they all pretty much produce the same effect. besides tramadol, which felt more like an antidepressant or something, and it’s kind of in its own category from what I understand.