A combination of chromatographic techniques is described for the screening of drugs in horse urine for antidoping control purposes. The procedure consists of liquid-liquid base extraction with analysis by HPTLC and GC-NPD and liquid-liquid acidic extraction followed by HPTLC and HPLC. The results of 86 drugs analyzed by these procedures, as well as limits of detection of the drugs in each technique are presented, The use of ELISA tests are recommended for the screening of drugs which would not be detected by the chromatographic proposed procedure. The results show that the proposed combination of techniques enables an efficient antidoping control of racing horses.