Wikipedia has a great page on benzodiazepine withdrawal and the potential hazards. If anyone ever doubts your experience of horror at getting off benzos direct them to this page that includes documentation of studies that prove benzos are nasty addictive shit.
Of note it points out that people can become dependent within 7 days as well as intermittent use being the cause of rebound insomnia which is why I caution people, in general, to not even take regular intermittent doses of benzos. Once in a blue moon is really all that is safe.
Here too is a page they have on benzodiazepines half-lives and equivalencies.
These pages are certainly not the final word on benzo withdrawal, but if you need a place to start it’s a good one.
And to the man (WillieJ) the other day who was challenging my comments about benzos, here is your answer in spades.
Being that benzodiazepine withdrawal is really the only psychotropic drug for which withdrawal has been studied, this is about as good as it gets on info about how nasty withdrawal can be from a somewhat credible source. There are of course many people who think Wikipedia is far from credible. But they do site their sources so follow the documentation links to studies if you must.
Unfortunately all psychotropics have similar profiles, with the exception that addiction may not set in quite as quickly. I know from my experience in withdrawal groups, however, that withdrawal can be just as nasty with all the psychotropics—antidepressants to neuroleptics to mood stabilizers. This wikipedia entry is a foreshadowing of the future once people start wisening up and struggling to get off the other psychotropics they’ve been put on.
For an extensive collection of information on benzodiazepines and withdrawal from them see here: Benzo Info