Theophylline interference in phenobarbital quantitation.
D002849:Chromatography, Gas; D006801:Humans; D010634:Phenobarbital / Q000097:blood* / Q000627:therapeutic use; D013806:Theophylline / Q000097:blood* / Q000627:therapeutic use
D013806:Theophylline; D010634:Phenobarbital