Aim:
Identifying of key criteria that influence the process of dispensing medicines by pharmacists by electronic prescriptions, and establish its’ relationship with the frequency of problems while paying off prescriptions.

Material and methods:
In our work we used the survey method involving questionnaires. To screen the obtained results, we used the method of intelligent data analysis depending on building the associative rules.

Results:
We analyzed the criteria that had influenced a choice of trade name of prescription medicines filled for patients by a pharmacist under e-prescription in the form of an international non-proprietary name.

Conclusions:
We have determined the criteria for selecting medicinal products by pharmaceutical clerks while filling e-prescriptions, which can be used in the practical activities of pharmaceutical workers as an integral part of the process of optimizing pharmacy inventories. The most important criteria have been found the amount of co-payment for medicine, the country of manufacture/medicines manufacturer, and the history of medicine administration by the patient. The criteria of the presence or absence of evidence-based data on the efficacy of a particular medicine and the medicine`s belonging to generics or original medicines have been found the least important. The inability of a pharmaceutical clerk/pharmacy worker to select a medicine based on one or more of the above selection criteria is considered one of the reasons for failure to dispense up to 20% of medicinal products under e-prescriptions.