*p=0.01 for achiral vs. racemic/non-racemic mixture drugs. p=0.04 for racemic/non-racemic mixture vs. pure enantiomers. p=0.01 and p=0.03 for pure enantiomers vs. achiral and racemic/non-racemic mixture drugs, respectively. A, Alimentary tract and metabolism; B, Blood and blood forming organs; C, Cardiovascular system; D, Dermatological; G, Genitourinary system and sex hormones; J, Anti-infectives for systemic use; L, Antineoplastic and immunomodulating agents; M, Musculoskeletal system; N, Nervous system; P, Antiparasitic products, insecticides and repellents; R, Respiratory system; S, Sensory organs; V, Various. Miscellaneous denotes drugs with multiple or undefined ATC codes.