Clorazepate (Tranxene) is a rather unique medication. Whereas
most benzodiazepines active ingredients act directly on the nervous
system, clorazepate's effects are due to it's metabolites (chiefly
nordiazepam, a metabolite of Valium). Valium is the longest acting
common benzo. Tranxene is likely to have a longer half-life than
Valium, but most studies to find how long it remains in your system
have been inconclusive. Research has suggested a range of anywhere
from 36-200+ hours. Literally days.