... at a clinic for addiction. 6 months ago, I had a drug test come up positive for Restoril. I have never taken this drug. They forced me to lower my methadone dose for two clean UA's. I wrote this off as a fluke until my most recent UA which came up positive for Serax, a drug I had never even heard of. The only medication I take is the Methadone. Sometimes I take Advil for my knees but thats it. Opiods were my drug of choice, never benzo's. Cant stand them. I have horrible memory loss when I take them. So I cannot understand how I'm testing positive for drugs I've never taken. Any ideas?