Sisa or shisha ( Greek: Σίσα) is a stimulant drug drug that became popular in Greece around 2009. [1] The basic ingredient is methamphetamine, with additives such as battery acid, engine oil, shampoo and salt. [2] It is abused by many homeless people in Athens, and causes dangerous side effects such as insomnia, delusions, heart attacks, and violent tendencies, due to being a highly impure and adulterated drug. [2] [3] Routes of administration include smoking, snorting, and intravenous injection. [1]