Letter: Use of a charcoal cartridge in isolating basic drugs from urine.
D002606:Charcoal; D002707:Chlordiazepoxide / Q000652:urine; D003042:Cocaine / Q000652:urine; D003975:Diazepam / Q000652:urine; D006801:Humans; D008702:Methaqualone / Q000652:urine; D004364:Pharmaceutical Preparations / Q000652:urine*
D004364:Pharmaceutical Preparations; D002606:Charcoal; D002707:Chlordiazepoxide; D008702:Methaqualone; D003042:Cocaine; D003975:Diazepam