Venlafaxine
"Venlafaxine can give you a false positive on a drug test. I'm in the military going on 17 years and I failed a drug test because of this medication. The military made me aware of my positive drug test and I gave them a list of all my medications. They were able to reevaluate my positive drug test and break it down further which showed it was in fact venlafaxine and not ampthetimines, like cocaine or meth. As for your job, I'd take them documentation and show them were venlafaxine can give a false positive and demand a review or ask to do another drug screening and have them do a full panel work up. Good luck. Hate that happened to you. Don't stop fighting till you get your job back.  That's discrimination if nothing else!"