**5. Conclusions**

The study has revealed the following aspects:

• Most of the population using the medical assistance with MMT is represented by male persons, with low level of education, predominantly without any occupation or with a temporary one. The average age of the patients is approximately 30 years; they have a long history of consumption of opiates (approximately 11 years); they predominantly use heroin injections, in most cases associated with other drugs (polyconsumption, i.e., high frequency of association with NPS); most of the patients present somatic comorbidities (HCV or HIV infections), and have several previous hospitalizations and lengths of treatment. The average age of the patients at the onset of the study is significantly different from the age of the patients at the onset of their drug consumption. The total duration of the consumption is statistically different from the duration of the consumption, previous to the first MMT.

