I had the tabs.... side effects from the word go, even on the low starting dose. Basically I'd sleep the two following days even if I was in a vertical position, it was like being in a zombie state. Brain function was way down, I couldn't function, really. GI told me people tend to loose about 10 - 20% brain function/brightness and often change their job/role to cope with the impact. As a software hacker by trade I just can't afford for that to happen and I was taken off it - and I dont feel I'm back to normal even after 4 months after.
Horrible stuff. If that's what is happening to you ask to change.