A Robitussin Overdose?

Out of curiousity, what would happen if someone overdosed on Robitussin, and how much would it take to OD?
Answers:
I don't know if you can overdose easily, but theres a chemical contained by cough syrup called DXM that induces mild hallucinations. After drinking a full bottle you will start to hallucinate. Your stomach will start to hurt as well.
I drank a complete bottle once. DXM is a mild hallucinogenic. Everything rippled (it was very weird) and I slept better than I ever have surrounded by my whole life. I would never do it again though.

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