"In 2017, a total of 27,150 clients received treatment, with most being treated in outpatient services. Of the 3,307 clients entering treatment in 2017, three out of every five were first-time clients. The number of previously treated treatment entrants has been decreasing since 2012, while the number of first-time entrants has been stable over this period. In addition, the number of OST clients in Portugal decreased between 2010 and 2013; however, it has remained relatively stable since then. In 2017, more than 16,000 clients received OST, mainly MMT."
European Monitoring Centre for Drugs and Drug Addiction (2019), Portugal: Country Drug Report 2019, Publications Office of the European Union, Luxembourg.