Staccato Alprazolam Abuse Liability

Phase 1

Completed

Conditions: Abuse Liability of Staccato Alprazolam

Interventions: Drug: Inhaled placebo + oral placebo
Drug: Inhaled alprazolam 0.5 mg
Drug: Inhaled alprazolam 1 mg
Drug: Inhaled alprazolam 2 mg
Drug: Oral alprazolam 1 mg
Drug: Oral alprazolam 2 mg
Drug: Oral alprazolam 4 m
Drug: Oral alprazolam 2 mg qualifying session
Drug: Oral placebo qualifying session

Registration Number: NCT00603980

Lead Sponsor: Alexza Pharmaceuticals, Inc.

Brief Summary: Compare the abuse liabilities of Staccato Alprazolam, oral immediate-release alprazolam, and Staccato Placebo.

Detailed Description: The Phase 1 clinical study compared the abuse liabilities of Staccato Alprazolam, oral immediate-release alprazolam, and Staccato Placebo in 14 subjects with a history of sedative abuse. Subjects who met the inclusion/exclusion criteria received 2 mg of oral alprazolam and matching placebo over 2 sessions. Those who demonstrated greater liking for alprazolam versus placebo were eligible to participate in the study.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 31

Inclusion Criteria

Male and female subjects between the ages of 18 to 55 years, inclusive, who have a history of substance abuse or dependence on barbiturates and/or benzodiazepine receptor agonists for their intoxicating effects

Exclusion Criteria

Subjects with a significant current psychiatric illness or taking any psychotropic prescription medications for therapeutic uses.

Study & Design

Study Type: INTERVENTIONAL

Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Treatment sequence 1	Inhaled placebo + oral placebo	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 1	Inhaled alprazolam 0.5 mg	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 1	Inhaled alprazolam 1 mg	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 1	Inhaled alprazolam 2 mg	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 1	Oral alprazolam 1 mg	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 1	Oral alprazolam 2 mg	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 1	Oral placebo qualifying session	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Inhaled placebo + oral placebo	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Inhaled alprazolam 0.5 mg	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Oral alprazolam 1 mg	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Oral alprazolam 2 mg	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Oral alprazolam 4 m	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Oral alprazolam 2 mg qualifying session	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Oral placebo qualifying session	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Inhaled placebo + oral placebo	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Inhaled alprazolam 0.5 mg	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 1	Oral alprazolam 4 m	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 1	Oral alprazolam 2 mg qualifying session	Sequence 1: Q, 1, 2, 7, 3, 6, 4, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Oral alprazolam 1 mg	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Inhaled alprazolam 1 mg	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Inhaled alprazolam 2 mg	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Oral alprazolam 4 m	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Oral alprazolam 2 mg qualifying session	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Oral placebo qualifying session	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Inhaled placebo + oral placebo	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Inhaled alprazolam 0.5 mg	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Inhaled alprazolam 2 mg	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Oral alprazolam 1 mg	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Oral alprazolam 4 m	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Oral alprazolam 2 mg qualifying session	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Oral placebo qualifying session	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Inhaled placebo + oral placebo	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Inhaled alprazolam 0.5 mg	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Inhaled alprazolam 1 mg	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Oral alprazolam 2 mg	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Oral alprazolam 4 m	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Oral alprazolam 2 mg qualifying session	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Oral placebo qualifying session	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Inhaled placebo + oral placebo	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Inhaled alprazolam 0.5 mg	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Oral alprazolam 2 mg	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Oral alprazolam 4 m	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Oral alprazolam 2 mg qualifying session	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Oral placebo qualifying session	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Inhaled placebo + oral placebo	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Inhaled alprazolam 0.5 mg	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Inhaled alprazolam 0.5 mg	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Inhaled alprazolam 1 mg	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Inhaled alprazolam 2 mg	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Oral alprazolam 1 mg	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Oral alprazolam 2 mg	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Oral alprazolam 4 m	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Oral alprazolam 2 mg qualifying session	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 7	Oral placebo qualifying session	Sequence 7: Q, 7, 1, 6, 2, 5, 3, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Inhaled placebo + oral placebo	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Oral alprazolam 1 mg	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Oral alprazolam 2 mg	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Oral alprazolam 4 m	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Oral alprazolam 2 mg qualifying session	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Oral placebo qualifying session	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Inhaled placebo + oral placebo	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Inhaled alprazolam 0.5 mg	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Inhaled alprazolam 1 mg	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Oral alprazolam 2 mg	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Oral alprazolam 4 m	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Inhaled alprazolam 2 mg	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Oral alprazolam 2 mg qualifying session	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Oral placebo qualifying session	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Inhaled placebo + oral placebo	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Inhaled alprazolam 0.5 mg	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Oral alprazolam 1 mg	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Oral alprazolam 2 mg	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Oral alprazolam 4 m	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Oral alprazolam 2 mg qualifying session	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Oral placebo qualifying session	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Inhaled placebo + oral placebo	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Inhaled alprazolam 0.5 mg	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Inhaled alprazolam 2 mg	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Oral alprazolam 2 mg	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Oral alprazolam 4 m	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Oral alprazolam 2 mg qualifying session	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Oral placebo qualifying session	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Inhaled placebo + oral placebo	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Inhaled alprazolam 0.5 mg	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Inhaled alprazolam 1 mg	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Oral alprazolam 1 mg	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Oral alprazolam 4 m	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Oral alprazolam 2 mg qualifying session	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Oral placebo qualifying session	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Inhaled placebo + oral placebo	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Inhaled alprazolam 0.5 mg	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Oral alprazolam 1 mg	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Oral alprazolam 2 mg	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Oral alprazolam 4 m	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Oral alprazolam 2 mg qualifying session	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Oral placebo qualifying session	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Inhaled placebo + oral placebo	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Inhaled alprazolam 0.5 mg	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Inhaled alprazolam 2 mg	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Oral alprazolam 2 mg	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Oral alprazolam 4 m	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Oral alprazolam 2 mg qualifying session	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Oral placebo qualifying session	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Inhaled alprazolam 1 mg	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 2	Inhaled alprazolam 2 mg	Sequence Q, 2: 2, 3, 1, 4, 7, 5, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Inhaled alprazolam 1 mg	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Inhaled alprazolam 2 mg	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Inhaled alprazolam 1 mg	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Inhaled alprazolam 1 mg	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 8	Inhaled alprazolam 2 mg	Sequence 8: Q, 5, 4, 6, 3, 7, 2, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Inhaled alprazolam 1 mg	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 10	Inhaled alprazolam 2 mg	Sequence 10: Q, 7, 6, 1, 5, 2, 4, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Inhaled alprazolam 1 mg	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Inhaled alprazolam 2 mg	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Inhaled alprazolam 1 mg	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 13	Inhaled alprazolam 2 mg	Sequence 13: Q, 3, 2, 4, 1, 5, 7, 6; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Inhaled alprazolam 1 mg	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Inhaled alprazolam 2 mg	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 4	Oral alprazolam 2 mg	Sequence 4: Q, 4, 5, 3, 6, 2, 7, 1; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 5	Oral alprazolam 1 mg	Sequence 5: Q, 5, 6, 4, 7, 3, 1, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 6	Oral alprazolam 1 mg	Sequence 6: Q, 6, 7, 5, 1, 4, 2, 3; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 9	Oral alprazolam 1 mg	Sequence 9: Q, 6, 5, 7, 4, 1, 3, 2; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 11	Oral alprazolam 1 mg	Sequence 11: Q, 1, 7, 2, 6, 3, 5, 4; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 14	Oral alprazolam 1 mg	Sequence 14: Q, 4, 3, 5, 2, 6, 1, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 3	Oral alprazolam 2 mg	Sequence 3: Q, 3, 4, 2, 5, 1, 6, 7; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 1=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg
Treatment sequence 12	Oral alprazolam 2 mg	Sequence 12: Q, 2, 1, 3, 7, 4, 6, 5; where Q=Qualifying sessions (2 mg oral alprazolam and placebo in random order), 11=placebo, 2=oral alprazolam 1 mg, 3= oral alprazolam 2 mg, 4= oral alprazolam 4 mg, 5= inhaled alprazolam 0.5 mg, 6= inhaled alprazolam 1 mg, 7= inhaled alprazolam 2 mg

Primary Outcome Measures

Name	Time	Method
Response to EDQ Question Number 5, "Rate the Degree to Which You Would Like to Take the Drug Again"	End of day for each of the 7 crossover treatments	The End of Day Questionnaire (EDQ) is a 7-question computerized instrument in which subjects rate the overall effect of the drug they received that day. The primary outcome measure for this trial is the categorical response to question number 5, "Rate the degree to which you would like to take the drug again", with a numerical value assigned to each of the responses allowed: 0=Not at all, 1=A little, 2=Moderately, 3=Quite a bit, 4=Very much

Secondary Outcome Measures

Name	Time	Method
EDQ Question Number 6 " Estimate the Amount of Money You Think the Drug You Took Today Would be Worth on the Street".	End of day for each of the 7 crossover treatments	EDQ question number 6 (of primary interest)," Estimate the amount of money you think the drug you took today would be worth on the street".
EDQ Question Number 2 "Rate Your Overall Liking of the Drug Effect"	End of day for each of the 7 crossover treatments	The within patient rank (1-7) of End of Day question number 2 (of primary interest), "Rate your overall liking of the drug effect", response options range from -4 to +4: * 4=Dislike very much * 3=Dislike quite a bit * 2=Dislike somewhat * 1=Dislike, but not very much 0=NEUTRAL OR NO EFFECT * 1=Like, but not very much * 2=Like somewhat * 3=Like quite a bit * 4=Like very much Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Maximum of DEQ Question 1 "Rate the Strength of the Drug Effect" (at the 10 Time Points, Predose Through 9 Hours)	DEQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of Drug Effect Questionnaire question number 1: Rate the STRENGTH of the drug effect you are feeling RIGHT NOW; response options range for 0 to 4: "No drug effect at all"=0, "Possible mild effect, but not sure"=1, "Definite mild effect"=2, "Moderate strong drug effect"=3, "Very strong drug effect"=4 Maximum of the 10 time points (predose through 9 hours) Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Observer Rated Questionnaire 2) Maximum of Muscle Relaxation Locomotor	ORQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of maximum of the observer rated the subject on muscle relaxation (locomotor) on a five-point scale from 0 (indicating normal or no effect) to 4 (indicating extreme drug effect). Maximum of the 10 time points (predose through 9 hours) Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Observer Rated Questionnaire 3) Maximum of Muscle Relaxation Non-locomotor	ORQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of maximum of the observer rated the subject on muscle relaxation (non-locomotor) on a five-point scale from 0 (indicating normal or no effect) to 4 (indicating extreme drug effect). Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Observer Rated Questionnaire 4) Maximum of Muscle Relaxation Posture	ORQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of maximum of the observer rated the subject on muscle relaxation (posture) on a five-point scale from 0 (indicating normal or no effect) to 4 (indicating extreme drug effect). Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
EDQ Question Number 1, "Rate the Overall Strength of the Drug Effect"	End of day for each of the 7 crossover treatments	The within patient rank (1-7) of End of Day question number 1, "Rate the overall strength of the drug effect", response options range from 0-4: 0=No drug effect at all 1. Possible mild effect, but not sure 2. Definite mild effect 3. Moderate strong drug effect 4. Very strong drug effect Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
EDQ Question Number 7,"What Would You be Willing to Pay for Today's Drug?"	End of day for each of the 7 crossover treatments	EDQ question number 7," What would you be willing to pay for today's drug?"
Maximum of DEQ Question 2 "Rate Your Liking of the Drug Effect" at the 10 Time Points (Predose Through 9 Hours)	DEQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of maximum of the Rate your LIKING of the drug effect you are feeling RIGHT NOW; response options range from -4 to +4: "Dislike very much"=-4, "Dislike quite a bit"=-3, "Dislike somewhat"=-2, "Dislike, but not very much"=-1, "NEUTRAL OR NO EFFECT"=0, "Like, but not very much"=1, "Like somewhat"=2, "Like quite a bit"=3, "Like very much"=4 Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Observer Rated Questionnaire 1) Maximum of Sedation/Sleepiness	ORQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of Maximum of Observer Rated Questionnaire (ORQ): A trained and blinded staff member completed observer ratings as the subject completed the questionnaires and psychomotor assessment testing at each time point. The observer rated the subject on sedation/sleepiness, muscle relaxation, impaired posture, impaired speech, confusion/disorientation, stimulation/arousal and strength of drug effect on a five-point scale from 0 (indicating normal or no effect) to 4 (indicating extreme drug effect). Maximum of the 10 time points (predose through 9 hours) Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Observer Rated Questionnaire 5) Maximum of Speech	ORQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of maximum of the observer rated the subject on speech on a five-point scale from 0 (indicating normal or no effect) to 4 (indicating extreme drug effect). Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Observer Rated Questionnaire 6) Maximum of Confusion/Disorientation	ORQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of maximum of the observer rated the subject on Confusion/Disorientation on a five-point scale from 0 (indicating normal or no effect) to 4 (indicating extreme drug effect). Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Observer Rated Questionnaire 7) Maximum of Stimulation/Arousal	ORQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of maximum of the observer rated the subject on Stimulation/Arousal on a five-point scale from 0 (indicating normal or no effect) to 4 (indicating extreme drug effect). Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect
Observer Rated Questionnaire 8) Maximum of Drug Strength	ORQ was assessed at the 10 time points (predose through 9 hours)	The within patient rank (1-7) of maximum of the observer rated the subject on Drug Strength on a five-point scale from 0 (indicating normal or no effect) to 4 (indicating extreme drug effect). Thus a higher rank means a stronger drug effect and a lower rank a lesser drug effect