There may be more reliable evidence that DXM can cause false positives for PCP and possibly cocaine.

So keep this in mind before using DXM if you have to take a drug test. If worse comes to worse, you can always claim you had a bad cold, and ask them to do a test which will discriminate between opiates and DXM. Good luck!
BlueCat Reviewed by BlueCat on . Quick question please help OK, I know I'm overreacting but I just need comfort. I did DXM about 2/3 weeks ago, like 700mgs. I smoked a little resin from a pipe about a week ago thats WICKED old so I doubt there was any THC there but I never know. Anyway, I have a drug test in a couple of days, I've never had one before. I naturally drink a lot of carbonated drinks like Mountain Dew and piss a lot. I think I'll be fine. Anyone got second oppion. Any response is good.:) Rating: 5