Identification of flurazepam (Dalmane) and a primary metabolite in urine by thin-layer chromatography.

A relatively simple, routine method has been described for the qualitative identification of flurazepam and its primary metabolite 7-chloro-1-(2-hydroxyethyl)-5-(2-fluorophenyl)-1,3-dihydro-2H-1,4-benzodiazepin-2-one in urine. We have described two extractions and several identification procedures by which flurazepam and its primary urinary metabolite can be identified by TLC.