Caffeine isn't an amphetamine so there are differences, but caffeine hardly having a noticeable effect isn't one of them. Dose is everything. If you stick to coffee or cola that limits you, but pick up a bottle of OTC caffeine pills and you can really start to get wired and hurt yourself.
You get nausea before anything. I’ve done 10 cups before in one sitting in college. Just makes the stomach hurt. Very little action in the head other than a growing headache. Completely different than adderall which gives a very noticeable high.
