Introduction:
A unit dose system enables the delivery of drugs from the hospital pharmacy to the hospital unit for a particular patient. Each dose is separately packaged and labeled with general information about the drug and the pa¬tient for whom it is designated. There is no need for prior drug transference, calculation, or handling by nurses. The drugs are stored in hospital units for the next 24 hours of treatment of each patient and are used in emergencies.

Material and method:
The aim of the study was to analyze the impact of a unit dose distribution system on opti¬mizing drug treatment. For this purpose, systematic literature review was performed. The methodology part was mod¬elled based on the article by Sinnemaki et al. [1]. 15 studies, which were conducted between 1997 and 2011, were included in the research (studies ranged from 1 month to 5 years). The studies regard the errors occurring during drug distribution, drug preparation time, accuracy of dispensing medications and the stability of drugs repacked into unit doses.

Results:
The study results indicated that medical errors were minimized when a unit dose system was used and an optimal time of drug preparation in a unit dose system was achieved. The pharmacy technicians and pharmacists were accurate in terms of preparing the unit doses. Furthermore, the drugs repacked into a unit dose are stable.

Conclusions:
It was noted that there is a need for further research to measure the impact of the unit dose system on optimizing drug treatment.