The current study is one of the first studies that preliminarily showed the initial factors associated with drug use and sex work among a group of at-risk women, who were seeking drug treatment in Tehran. A number of extrinsic and intrinsic motivations were associated with initial drug use and sex work among the studied cases. Most of these women frequently reported that they initiated drug use because of drug-using family members and relatives. The availability of drugs among their families and relatives followed by encouraging or forcing them to use drugs, were important triggers at initiation. Their drug-using family members or relatives were likely to realize that a non-drug-using family member was a threat against continued drug use. Therefore, they encouraged or forced several of the women to initiate drug use. Studies show that women are more likely to have relatives who have drug use issues (
11). Women are more likely than men to have a spouse who uses drugs (
12). Drug-using friends or social networks were frequently reported by several of our women, as initial factors associated with drug use. Drug-using friends, especially men friends, and social networks, such as neighbors, were likely to consider offering drugs to the study women as a strategy to show intimacy or close friendship. Drug availability facilitated by social networks, such as men friends, has been frequently cited as an initial factors associated with drug use among women (
11-
13). Several women reported that they initiated drug use because of their intrinsic motivations. They reported that they were curious about the effects of drug use. They were likely to consider drug use as a recreational activity or as a strategy to self-medicate mental distress. Intrinsic motivations still deserve further research and necessitate implementing drug education and prevention programs. In addition, several women reported that they initiated drug use because of an individual willingness. These women should be informed about the side effects of drug use before making a decision to start drugs, by recognizing their high risk for such a dependence behavior. Several studies in the US showed that women initiated drug use because of an individual willingness to use drugs, such as self-medication (
12). The study results confirmed the reasons associated with initial drug use and sex work. Providing money to purchase drugs was the most frequently reported reason for initial sex work among several of the women in our study. There were participants who reported that they were forced by a man in the family to initiate sex with others to provide money for drugs. Drug education about the harms associated with sex work including HIV and hepatitis C virus (HCV) should be provided for these women and their families. Providing counseling and training services to find jobs is suggested. Literature has shown a strong relationship between sex work and drug use in other countries, such as the US (
14-
16). Cusick et al. (
17) identified vulnerability and involving in sex work among 125 drug-using women. They found that most sex workers started sex to provide money for drugs. Several women reported that they were unemployed and required money for themselves or their families. Lack of vocational training and counseling were likely to be important reasons associated with initial sex work among those women. They were likely to have no information about job opportunities in the community. Studies show that drug-dependent women, under specialized treatment, require counseling and training to find jobs (
18). To sum up, drug use may contribute to initial sex work among women and vice versa. Women sex workers, who are drug-dependent, have special treatment needs. In addition to drug treatment, they may need vocational training, financial support, family therapy, safe sex education, safe injection and free HIV/HCV testing, counseling and treatment. Women-only programs have been found to provide a greater number of the ancillary services needed by women (
19), which may facilitate treatment enrollment and retention (
20). In addition to women-only participants, women staff members who can serve as role models are also seen as providing a positive impact on the treatment environment (
21). Special drug treatment and supportive services should be provided for at-risk women drug users in Iran, to prevent sex work. In addition, staff training and education should be provided in Iran when at-risk women drug users, especially sex workers, enter drug treatment.
The study also had several limitations. First, the study design was cross-sectional. Second, the study sample was limited to a group of at-risk women at five women centers in Tehran who were engaged in drug injection or sex work. As a result, the study results may not be generalizable to other groups of women drug users or other parts of Iran. Third, because of the paucity of research, our methodology was limited to content analysis techniques and qualitative design. Further studies, with a more representative number of women, are suggested. In addition, a combination of qualitative and quantitative analyses may provide more information on this issue.