I've got some Lorazepam from RXMostwanted (aka DrugsMostWanted) that is manufactured by VGR Bio Laboratories. It seems like I have to take quite a bit more than the prescribed does to really feel much, like 4 mg to really feel it. 1mg I don't notice anything.

Is there that much of a range in quality for generic Benzodiazepines? Are there certain labs to stay away from?

If there is a difference in quality, is it because there is actually less of the active ingredient in the pill than stated or is it because the drug has been poorly formulated?