Isnt it amazing how just 5 mg more of prozac will make such a GOOD difference? But 10 mg more will give me brain freeze! I dont think they have studied what the drug does at 30 35 40. I think they think once youre up there, add on another 10 or 20, big deal. But to some of us, its probably a difference between the drug working or not, and then trying to find another drug. I am soooooo happy at 35!!!.