Background: Alcohol Use Disorders Identification Test Consumption (AUDIT-C) questionnaire as a screening instrument for identification of hazardous and harmful drinkers give some false-positive and negative results. Changes of answers decrease the number of false results. Methods: Changes in second and third questions with theoretical simulation of possible answers' combinations was made; cutoff scores have to be changed. Study with original and adapted AUDIT-C was conducted among 298 students to analyze the differences. Results: Adapted Slovenian version of AUDIT-C gives less false-positive and less false-negative results. Conclusions: Changes of AUDIT-C questionnaire that give less false results means less potential disharmony in doctor-patient relationship, less unnecessary questioning, less time spent inadequately, and also less missed hazardous drinkers.