Tusi is a drug concoction that has emerged in Latin America and Europe and is now beginning to gain popularity in the United States. It is a phonetic translation of "2C," a series of psychedelic phenethylamines, but the concoction rarely contains 2C series drugs. Instead, multiple drug checking studies have found that the majority of tusi samples contain ketamine, often combined with 3,4-methylenedioxymethamphetamine (MDMA), methamphetamine, cocaine, opioids, and/or new psychoactive substances. Tusi is also sometimes referred to as "pink cocaine" as it typically comes in the form of pink powder. It is usually snorted by clubgoers looking for a euphoric high and is sometimes dissolved in drinks, which is why many people call it “happy water” . Tusi has the potential to confuse both people who use it and researchers alike, and unintentional exposure to its contents can lead to increased risk of adverse effects.