Table 2.

Pharmacological class questionnaire: percentage of participants choosing each class¹

Drug class descriptor2	Placebo N=12	0.25 TRZ N=12	0.5 TRZ N=12	100 DXM N=12	200 DXM N=12	300 DXM N=12	400 DXM N=12	500 DXM N=10	600 DXM N=8	700 DXM N=4	800 DXM N=2	Penultimate DXM N=12	Maximum DXM N=12
Blank/placebo	75.0	41.7	8.3	25.0	0.0	8.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Alcohol	0.0	0.0	0.0	0.0	8.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Sedative-hypnotic	0.0	50.0	66.7	16.7	16.7	8.3	0.0	0.0	12.5	0.0	0.0	8.3	8.3
Muscle relaxant	0.0	0.0	8.3	0.0	8.3	8.3	0.0	0.0	0.0	0.0	0.0	8.3	0.0
Opioid	0.0	0.0	16.7	0.0	0.0	0.0	0.0	10.0	0.0	0.0	0.0	8.3	0.0
Stimulant	8.3	0.0	0.0	8.3	16.7	8.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Dissociative anesthetic hallucinogen	0.0	0.0	0.0	8.3	8.3	25.0	0.0	20.0	0.0	0.0	0.0	8.3	0.0
Classic hallucinogen	8.3	8.3	0.0	33.3	41.7	33.3	91.7	70.0	87.5	100.0	100.0	66.7	91.7
Other naturally occurring hallucinogen	0.0	0.0	0.0	8.3	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Other	8.3	0.0	0.0	0.0	0.0	8.3	8.3	0.0	0.0	0.0	0.0	0.0	0.0

¹Data are the percentage of participants selecting each class. Number of participants who received each drug condition is indicated by the numeral (N=) under each drug condition. TRZ (triazolam); DXM (dextromethorphan)

²Participants were required to choose among 18 possible drugs or drug classes. For the three most relevant drug classes, the example drugs provided were: Sedative-hypnotics (Xanax, Klonapin, Ativan, Valium, Librium, Ambien, phenobarbital, pentobarbital); Classic hallucinogens (LSD, acid, psilocybin, magic mushrooms, DMT, ayahuasca, LSA, morning glory, mescaline, peyote, foxy methoxy, 2C-B); Dissociative anesthetic hallucinogens (ketamine, K, special K, dextromethorphan, DXM, cough syrup, robotripping, skittles, PCP, dippers, angel dust, embalming fluid). Ten drugs or drug classes, which were not selected by any participant, are not shown in the table (GHB and related; caffeine; ephedrine; nicotine; cannabis, MDMA, inhalant; nitrous oxide)