Magister Scientiae - MSc (Pharmacy Administration and Policy Regulation) / The aim of this study is to provide more information in terms of the cost-effectiveness of selecting an enantiopure formulation over a racemic mixture in the context of promoting rational use of medicines. This was done by comparing costs and efficacy of escitalopram versus citalopram and esomeprazole versus omeprazole since they are the most commonly used medicines with both racemate and enantiopure products registered.