About DXM
DXM is the active ingredient found in many prescription and over the counter cough syrups. It is often abused by using in high doses for its euphoric feeling and visual and auditory hallucinations. Robitussin and Coricidin are the most commonly used brands.
Use
Usually in syrup form. Sometimes mixed with other ingredients to improve flavor, or make it more drink like. Use in tablet or gel form is increasing.
Street names
Robo-tripping, skittling
Risks

Hyperexcitability, lethargy, lack of muscle coordination, slurred speech, sweating, hypertension, and/or involuntary eye movement. Other possible risks, especially when different DXM products are combined include increased blood pressure, liver damage, central nervous system toxicity, heart problems.

Warning
When combined with alcohol or other drugs, very dangerous side effects can occur — including death.