2 ms·

No, it's primarily an adenosine antagonist. http://en.wikipedia.org/wiki/Caffeine#Mechanism_of_action http://en.wikipedia.org/wiki/Caffeine#Mechanism_of_action

• derefr 13y ago
  Right, that's why I said "effectively": caffeine inhibits adenosine from inhibiting cholinesterase (which itself inhibits acetylcholine.) Isn't biology fun?
  • jey 13y ago
    That may be true, but the difference is that caffeine doesn't inhibit cholinesterase across the board.