Opioids, stimulants, and depressant drugs in fifteen Mexican Cities: A wastewater-based epidemiological study.

Background: Monitoring drug use in México is a challenge due to emerging drugs and rapid changes in consumption patterns. The temporal and geographical patterns of cocaine, methamphetamine, amphetamine, MDMA, cannabis, heroin, ketamine, and fentanyl were examined in Mexican cities using wastewater-based epidemiology (WBE).

Methods: 105 daily composite wastewater samples were collected from sewage treatment plants in fifteen Mexican cities.