Benzodiazepines show up on drug tests, and if you are prescribed these, that should not cause a problem unless you are in a safety-sensitive job. Soma (carisoprodol) is metabolized to meprobamate, a barbiturate-like drug which some testing kits might look for. read more
It is the only muscle relaxant that is unless you are using a benzodiazepine for a muscle relaxant (f.i valium or diazepam). Drugs like Flexeril, zanaflex, baclofen, robaxin, skelaxin-they are not controlled drugs and they probably are not going to be looking for these in a drug screen. read more