One of the funny things about people using DXM to get high is that they sometimes find one with psuedoephedrine and not know what it does. When you drink a bottle of cough syrup with both ingredients, you are happy and lucy one day and dead from liver malfunction the next.
And a Big Straight Dope “Thank you!” to gtzaskar00 for so kindly providing step-by-step instructions for exactly how much Robitussin or dramamine is needed to get you high. :rolleyes:
Don’t forget this, kiddies…
Too much Psudoephidrine HCL can cause extreme enlargement of the prostrate.
Simply put, Ya can’t pee.
At All.
As I am a guy with more allergies than I care to think about right now, I KNOW.
Do you want to have to go to the emergency room after several days of no urination, only to be painfuly catherized?
I didn’t think so.
That and I used to know a guy in the Air Force that tried to kill himself with his wife’s prescription Tylenol.
The “cure” involved him drinking a shot of something that looked and smelled like fresh baby shit. Every half hour for two days.
Gah.
Don’t mess with OTC kids!
Before you go chugging that bottle of cough syrup you should know that there’s at least a possibility that DXM causes brain lesions.
especally after an evening of binge drinking…
I just asked my dad about this (he’s a PharmD), and he said that Benadryl is slightly to moderately anticholinergic, but that if you take enough Benadryl to hallucinate, you’ll likely be dead first.
Robin
This struck me as funny…
Damn you mom (or “Dr.Mom” as she’s know at the Robitussin web site) for forcing that wretched stuff down my gullet when I was a kid! 
please,please,please, read this and this before you take anything you don’t know about.
I have tried both DXM, and benadryl and can attest that all of the information on those websites is in line with my experences, so don’t be misinformed.
found one more: here
this is the most informative of the three.