A woman brings her teenage daughter into the emergency department

A woman brings her teenage daughter into the emergency department. The teen is lethargic, dizzy, and has been vomiting. While the teen is being examined and stabilized, the mother tells the nurse that her daughter told her that she and her friends used Cough Syrup to get high. The mother states, 1-“How could Cough Syrup do this?”  2-What is the nurse’s Best answer?