[Use of synthetic substances in France and in Europe].

This paper aims to present the main information presented at the 9th Meeting about addictovigilance in 2016 by four healthcare professionals and addiction experts on the issue of new psychoactive substance use. A new psychoactive substance (NPS) is defined as a narcotic or psychotropic drug, in pure form or in preparation, that is not controlled by the United Nations drug conventions, but which may pose a public health threat comparable to that posed by substances listed in these conventions. The emergence of NPS consumption is a worldwide concern. Although NPS are less consumed than established drugs, there has been a sharp increase in their use over the last few years, notably of synthetic cathinones, synthetic cannabinoids and, more recently, synthetic opioids. The latter in particular are involved in deaths in Europe. However, "established" drugs (MDMA [methylenedioxymethamphetamine], amphetamines, LSD, methamphetamine) are far from being dethroned by the more recent substances: they are considered "a safe bet" already "tried and tested" by many consumers over the years. MDMA, in particular, also known as ecstasy, which has been used as a recreational drug since the 1990s, saw its consumption decrease until 2010, and then increase again, especially in higher amounts; inexpensive and easily accessible, it is increasingly associated with emergency admissions or deaths in France. The perpetual appearance of new substances on the drug market is obligating to improve knowledge on these products, particularly by focusing on their analytical identification, and also by monitoring their use and harms.