SUMMARY AIM: The purpose of this survey was to investigate the frequency of leftover drugs at homes and related factors regarding this problem. METHOD: This descriptive study was performed among 692 non-medical personnel servicing at two military bases in December 2006. Data were collected by using a questionnaire, which had been developed by the investigators. Frequencies and percents were used as descriptive statistics. Chi-square test was used to compare the frequencies of leftover drugs according to certain variables. RESULTS: Of the total participants 78,8% were males, 72,8% aged between 18 to 39, and 29,6% were unmarried. The findings revealed that 61,3% of the participants had leftover drugs at their homes. Participants living with together 2 to 4 family members had higher frequencies of leftover drugs at homes. When we looked at the frequencies of leftover drugs according to drug use behaviors; the frequency of leftover drug was determined higher among those who stated; the recipe was not explained sufficiently, he did not use drugs as directed, he kept drugs until due time when did not use all of the drugs, he kept drugs in a box or bag, he visited a health center in order to have a recipe (p<0,05). CONCLUSION: It was determined leftover drugs were kept at nearly two third of the participants’ homes. Regarding incompleteness of treatment, the intoxication risk for children, and drug waste, this frequency of drug leftover was high, and all responsible professions in the chain of rationale drug use particularly physicians should be awaked on this issue. The use of drugs in a recipe should be explained to patients clearly.