the excellent resolution of the method allows the complete separation of theophylline , internal standard , and caffeine from frequently encountered interfering drugs including acetaminophen , acetazolamide , acetylsalicylate , ampicillin , 8-chlorotheophylline , cefazolin , cephalosporin c , cephalothin , cephapirin , chloramphenicol , dyphylline , metronidazole , 3-methylxanthine , salicylate , sulfadiazine , sulfamerizine , sulfamethazine , sulfamethoxazole , sulfisoxazole , and theobromine .
C0039771
theophylline
C0013360
dyphylline