Exactly. I can say the effects of Klonopins for me have diminished QUITE a bit over 8 months and I was doubled the first 4 months of taking it. (not at all for abusing the drug.. bi polar as well as insomnia so taking lamictal as well), now i'm at a point where i'm taking 3 mg's a day and not feeling really anything at all from it. My "personal" limit before starting was 4 mg a day before I basically told the Dr. I needed to try something else (don't want to be completely hooked to these drugs as i'm married with a family.) So now I visit the Dr. in a month and a half for an update and i'm really not sure where to go or what to do now... so anyway.. back to the subject.. it can vary very widely.(size doesn't have anything to do with it either as in most peoples minds i'm a smaller sized person)EVERYBODY IS DIFFERENT!
My body quickly acclimates to benzodiazepines. Xanax and Ativan did nothing for me by their 4th days, even upping the Ativan to 4mg (the dosage normally to put you to sleep) did nothing for me.
I just started Klonopin. It really does seem to last most of the day, and I highly doubt I'll have to continue to up it after the first trial month. After being on it for a week I can totally see why it's so controlled when prescribed - it's not a kiddie drug, let me tell ya.
It also may end up not being the right drug for you, but correctly controlled trial runs with anti-anxiety meds can't hurt (unlike other drugs).