Ever heard of projectile vomitting?
If you try to take this medication recreationally chances are you'll get to experience it first hand.

Also, it says it is extended release which means the dxm is absorbed over the course of several hours and not all at once. To get any trip from them you would have to crush/break the pills or increase the dosage. After the fact you will surely be taking enough guaifenesin to induce projectile vomitting.