Dextromethorphan (DXM) is the active ingredient in many cough and cold medicines and is highly abusable and addictive (not to mention very dangerous!)
In my many years as an addiction counselor, this drug has landed more of my clients in the hospital than any other drug. Commonly referred to as robotripping, people take large quantities is a medication that contains DXM to get high. DXM is found in Robitussin, Coricidin Cough and Cold (Triple C's), Mucinex, Nyquil, Theraflu, and many others.
Most households have these medications in their home and haven't thought twice about the dangers involved. Especially if it's easily accessible to their loved one who struggles with substance abuse disorder. To be safe, I would suggest putting it away.
Hope for Families Recovery Center