Thanks for the insights Robi. He actually did do a little research first, and heard (from who knows where) that children's Robitussin DM was supposed to be the "right" one to use, since they don't dope up the children's version with as many other drugs. Guess he was wrong though.
If the experience is as you describe, it's curious that this hasn't become more popular, or that DXM isn't regulated.
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