I've had cocaine a few times now and while everyone is saying it's euphoric, I keep saying it's the most normal I've ever felt. Not "euphoric", I've done other stuff that felt suuuuper good (in an actual euphoria sense) so I believe can compare.
But normal. The cloud of thoughts gone, I am able to make myself do anything with one thought, I have energy, the aches are gone, the tinnitus is gone, I don't second guess, I don't overthink. I just am and I do. It's amazing. This is what people like Bezos and Musk must be like lol
Amphetamine probably feels like this, too, although many say it's actually quite distinct. The price, (un)availability, very short duration and the comedown are big negatives, sadly.
But yeah, comparing it to caffeine... nah. Can't comment on IV, but I can compare it to insufflated caffeine. It has some similarities, but the important parts are missing. Or maybe I'm just desensitized to caffeine. At least I'm a good fake coke detector lol