This study presents the advantages of the 20 mu m inner diameter (id) capillary for the enantioseparation of ten basic drugs with native beta-CD as the chiral selector. The apparent binding constants of each enantionneric pair were determined to calculate the optimum P-CD concentration ([beta-CD](opt)) and the optimization was subsequently carried out. Comparison of the 20 jam id with 50 mu mn id were made in terms of the results obtained in the optimization and detection limits. Applying the optimum conditions for each compound, reproducible results (RSD from 0-3; n > 5) were obtained for the 20 lam id capillary. Although the sensitivity is lower in the 20 mu m id capillary, the LOD determined using this capillary is still found to be acceptable for the ten basic drugs studied. Enhanced resolution and faster analysis times were the main advantages observed with the use of this capillary in enantioseparation.