Slang terms or alternate titles carfentanil-heroin-fentanyl fentanyl-carfentanil-heroin heroin-fentanyl-carfentanil fentanyl-heroin-carfentanil carfentanil-fentanyl-heroin heroin-carfentanil-fentanyl A combination of carfentanil, fentanyl, and heroin Source - Choose - synthetic