Eutomer, distomer and eudismic ratio

Enantiomers of an Active Pharmacological Ingredient must be regarded as two distinct species. Most of times, one of them has a higher activity than the other. The isomer with the highest activity is denoted as the eutomer, whereas its enantiomeric counterpart, possessing less or even undesired activities, is termed the distomer. The ratio of the activities of both enantiomers is known as the eudismic ratio.