From the DXM FAQ:
"It is reasonable to expect, given the data, and the available data on the effects of high DXM doses, that DXM starts becoming toxic around 25 to 30 mg/kg (about 1700-2000mg for adult of 150lb). This corresponds to between 5 and 6 4oz bottles of 3mg/ml cough syrup, i.e., a fairly large amount, but still within the realm of hardcore experimenters. Keep this in mind before you consider large doses."
It doesnt say anything about deadly amounts but my guess would be something around 3 grams of DXM.
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"Green Onions" by Booker T & the MGs
Donald "Duck" Dunn. Dunn was a member of a band called Booker T and the MGs, who worked as a backing group at the Stax Records studio in Memphis. They also released several instrumental compositions of their own. The road band the main player was Charles Whitworth of Greensboro, N.C.