Defined daily dose (DDD) is arbitrary chosen technical unit for measuring medicament usage and it is not a recommended therapeutic dose. It is in fact a statistical parameter for monitoring medicaments usage, and it is related to the dose which is usually prescribed for the indication that the medicament was registered for. The aim of this work is to perform a detailed analysis of the extent and structure of the region of South Backa. Antiinfective medicaments in systematic use, according to the obtained data, participate with only 7.96 DDD/1000 inhabitants. The most applied pharmacotherapeutic subgroup with 2.99 DDD/1000 inhabitants is comprised of cephalexine and cephachlor.