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. 2011 Jul;338(1):255–262. doi: 10.1124/jpet.111.181131

TABLE 3.

Pharmacological class questionnaire

Numbers shown are percentages of drug identifications made for each dose condition at the 120-min time point, from a total of eight subjects.

Placebo HM (mg)
MPH (mg)
Tramadol (mg)
4 8 30 60 50 100 200 400
Placebo 100 25 0 0 0 100 75 37 25
Opioid Agonist 0 75 100 0 0 0 25 63 63
Stimulant 0 0 0 100 100 0 0 0 12