Effect of phenazopyridine hydrochloride ("Pyridium") on determination of ethchlorvynol ("Placidyl").
D004984:Ethchlorvynol / Q000032:analysis* / Q000097:blood / Q000652:urine; D005189:False Positive Reactions; D006801:Humans; D010621:Phenazopyridine / Q000097:blood / Q000627:therapeutic use / Q000652:urine; D013053:Spectrophotometry
D004984:Ethchlorvynol; D010621:Phenazopyridine