Adding to MDMA’s risks is that pills, capsules, or powders sold as Ecstasy and supposedly “pure” Molly may contain other drugs instead of or in addition to MDMA. Much of the Molly seized by the police contains additives such as cocaine, ketamine, methamphetamine, over-the-counter cough medicine, or synthetic cathinones (“bath salts”).

https://nida.nih.gov/publications/drugfacts/mdma-ecstasymolly