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Showing 1–24 of 29 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Subjective Drug Effects Clear all
Completed Phase 2 Interventional Results available

Laboratory Study of Cannabidiol on the Effects of Smoked Marijuana

NCT01844687
View directory record Official record
Conditions
Smoking, Marijuana
Interventions
CBD
Drug
Lead sponsor
National Institute on Drug Abuse (NIDA)
NIH
Eligibility
18 Years to 50 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
3
States / cities
Lexington, Kentucky • New York, New York • Charleston, South Carolina
Source: ClinicalTrials.gov public record
Updated Dec 8, 2019 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Psychological Effects of Methylenedioxymethamphetamine (MDMA) When Administered to Healthy Volunteers

NCT01404754
View directory record Official record
Conditions
Psychological Effects of Study Drug
Interventions
Lactose (inactive placebo), midomafetamine HCl
Drug
Lead sponsor
Resilient Pharmaceuticals
Industry
Eligibility
21 Years and older
Enrollment
107 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2011 – 2022
U.S. locations
3
States / cities
Boulder, Colorado • Santa Fe, New Mexico • Mt. Pleasant, South Carolina
Source: ClinicalTrials.gov public record
Updated Oct 30, 2024 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Not applicable Interventional

Effects of Combined Sevoflurane and Nitrous Oxide Inhalation - 14

NCT00000262
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
30% Nitrous oxide, 0.4% Sevoflurane, 0.2% sevoflurane, Placebo
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
Not listed
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 1999
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 26, 2015 · Synced Sep 7, 2026, 4:37 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

Behavioral Pharmacology of Orally Administered THC and D-limonene

NCT06378957
View directory record Official record
Conditions
Subjective Drug Effects, THC, D-limonene
Interventions
D-Limonene, Delta-9-THC, Placebo
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
21 Years to 55 Years
Enrollment
65 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 7, 2026, 4:37 PM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Effects of Cannabis Species Labeling and Marketing on Perceptual, Subjective and Objective Use Outcomes (Aim 2 Study)

NCT07513337
View directory record Official record
Conditions
Cannabis Use
Interventions
Strain label, Claim
Other
Lead sponsor
Johns Hopkins Bloomberg School of Public Health
Other
Eligibility
21 Years and older
Enrollment
2,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 19, 2026 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Effects of Subanesthetic Concentrations of Isoflurane/Nitrous Oxide - 3

NCT00000251
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
30% N2O, 0.2% isoflurane, 0.4% isoflurane, 100% oxygen
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
21 Years to 32 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1994 – 1996
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Dec 1, 2015 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 4 Interventional

Subjective Efficacy of Ramelteon on Sleep in Adults With Chronic Insomnia.

NCT00414102
View directory record Official record
Conditions
Chronic Insomnia
Interventions
Ramelteon, Placebo
Drug
Lead sponsor
Takeda
Industry
Eligibility
18 Years to 64 Years
Enrollment
552 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
52
States / cities
Phoenix, Arizona • Tucson, Arizona • Hot Springs, Arkansas + 49 more
Source: ClinicalTrials.gov public record
Updated Jun 27, 2016 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Effects of Hallucinogens and Other Drugs on Mood and Performance

NCT02033707
View directory record Official record
Conditions
Healthy
Interventions
Hallucinogens and psychoactive substances
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
21 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2019
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 15, 2019 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 2 Interventional Results available

Nicotinic Treatment of Post-Chemotherapy Subjective Cognitive Impairment: A Pilot Study

NCT02312934
View directory record Official record
Conditions
Chemo Brain, Chemotherapy-related Cognitive Impairment, Chemo Fog, Breast Cancer, Chemobrain
Interventions
Transdermal nicotine, Placebo Transdermal Patch
Drug · Other
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
35 Years to 80 Years · Female only
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Jan 20, 2020 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Characterization of Product Use in Smokers Switching From Cigarettes to a RELX Electronic Nicotine Delivery System

NCT04708106
View directory record Official record
Conditions
Electronic Cigarette Use
Interventions
RELX ENDS Tobacco Flavor, RELX ENDS Menthol Flavor, RELX ENDS Tobacco and Menthol Flavors
Other
Lead sponsor
Cheerain HK Limited
Industry
Eligibility
22 Years to 65 Years
Enrollment
194 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2021
U.S. locations
5
States / cities
Bentonville, Arkansas • Lexington, Kentucky • Springfield, Missouri + 2 more
Source: ClinicalTrials.gov public record
Updated Jul 21, 2021 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Physiological, Behavioral and Subjective Effects of Drugs (GHB)

NCT00058955
View directory record Official record
Conditions
Sedative Abuse
Interventions
sodium oxybate, triazolam and pentobarbital
Drug
Lead sponsor
Orphan Medical
Industry
Eligibility
18 Years to 50 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2003 – 2005
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Sep 9, 2008 · Synced Sep 7, 2026, 4:37 PM EDT
Not yet recruiting Phase 1 Interventional Accepts healthy volunteers

Evaluation of Oral THC and CBD in Men and Women

NCT05067387
View directory record Official record
Conditions
Drug Abuse, Intoxication by Drug, Impairment
Interventions
Placebo, THC, CBD, THC + CBD
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years to 55 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Jun 10, 2026 · Synced Sep 7, 2026, 4:37 PM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Effects of Progesterone on IV Nicotine-Induced Changes in Hormones and Subjective Ratings of Stimulant Drug Effect

NCT01589081
View directory record Official record
Conditions
Nicotine Dependence
Interventions
Intravenous Nicotine, Progesterone
Drug
Lead sponsor
Mclean Hospital
Other
Eligibility
18 Years to 40 Years · Female only
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2015
U.S. locations
1
States / cities
Belmont, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 16, 2024 · Synced Sep 7, 2026, 4:37 PM EDT
Recruiting Phase 1 Interventional Accepts healthy volunteers

Clinical Study to Evaluate the Effects of Oral Delta-9-tetrahydrocannabinol (Δ9-THC) With and Without Alcohol on Perception and Driving Performance in Healthy Adults

NCT07176208
View directory record Official record
Conditions
Cannabis, Drug Effects, Driving Performance
Interventions
5 mg Dronabinol (Marinol®) + Placebo Beverage, 10 mg Dronabinol (Marinol®) + Placebo Beverage, 5 mg Dronabinol (Marinol®) + Alcohol Beverage, 10 mg Dronabinol (Marinol®) + Alcohol Beverage, Placebo Capsule + Alcohol Beverage, Placebo Capsule + Placebo Beverage
Drug
Lead sponsor
Food and Drug Administration (FDA)
Federal
Eligibility
21 Years to 55 Years
Enrollment
48 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2026
U.S. locations
2
States / cities
West Bend, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jan 15, 2026 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Effects of Levetiracetam (Keppra) on Alcohol Consumption

NCT01168687
View directory record Official record
Conditions
Alcohol Abuse, Drug Abuse
Interventions
Levetiracetam (Keppra), Placebo
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
21 Years to 50 Years
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Aug 27, 2020 · Synced Sep 7, 2026, 4:37 PM EDT
Active, not recruiting Phase 1 Interventional Accepts healthy volunteers

Analgesic and Subjective Effects of Terpenes

NCT04451863
View directory record Official record
Conditions
Pain, Abuse, Drug
Interventions
Low THC, High THC, Low Myrcene, High Myrcene, Low Beta-Caryophyllene, High Beta-Caryophyllene, Placebo
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years to 55 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated May 14, 2026 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Effects of Commonly Used Medications on Mood and Choice

NCT03652740
View directory record Official record
Conditions
Healthy
Interventions
Placebo, Methylphenidate, Nicotine
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 65 Years
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 1, 2026 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Combined Alcohol and Nitrous Oxide Intake - 15

NCT00000263
View directory record Official record
Conditions
Opioid-Related Disorders, Substance-Related Disorders
Interventions
30% Nitrous oxide, 0.25 g/Kg ethanol, 0.5 g/KG ethanol, 0 g/Kg ethanol
Drug · Other
Lead sponsor
University of Chicago
Other
Eligibility
Not listed
Enrollment
11 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1997 – 1998
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 26, 2015 · Synced Sep 7, 2026, 4:37 PM EDT
Terminated Phase 1 Interventional Accepts healthy volunteers Results available

Effects of Dietary Conditions on Drug Response

NCT04315961
View directory record Official record
Conditions
Healthy
Interventions
Blinded drug dose conditions
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 45 Years
Enrollment
1 participant
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 8, 2024 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Evaluation of Smoked THC and CBD in Men and Women

NCT05037487
View directory record Official record
Conditions
Drug Abuse, Intoxication by Drug, Impairment
Interventions
Placebo Cannabis, 20 mg CBD Cannabis, 20 mg CBD + 20 mg THC Cannabis, 20 mg THC Cannabis
Drug
Lead sponsor
University of California, Los Angeles
Other
Eligibility
21 Years to 55 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Mar 19, 2026 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 2 Interventional

Evaluation of A Morning Dosing Of A New Medicine And Its Effects On Sleep At Bedtime In Subjects With Primary Insomnia

NCT00354809
View directory record Official record
Conditions
Sleep Initiation and Maintenance Disorders, Insomnia
Interventions
GW679769
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 64 Years
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2007
U.S. locations
13
States / cities
Glendale, Arizona • Glendale, California • Hallandale, Florida + 10 more
Source: ClinicalTrials.gov public record
Updated Apr 15, 2015 · Synced Sep 7, 2026, 4:37 PM EDT
Completed Phase 2 Interventional

Behavioral and Subjective Efficacy of Ramelteon in Subjects With a History of Polydrug Abuse

NCT00671632
View directory record Official record
Conditions
Drug Abuse
Interventions
Ramelteon, triazolam, and placebo (56 possible combinations total)
Drug
Lead sponsor
Takeda
Industry
Eligibility
18 Years to 60 Years
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Feb 27, 2012 · Synced Sep 7, 2026, 4:37 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Influence of Authorized Smokeless Tobacco Product Modified Risk Claims II: Laboratory Assessment of Sensory and Subjective Effects

NCT07107139
View directory record Official record
Conditions
Smokeless Tobacco
Interventions
Copenhagen group, Snus group
Other
Lead sponsor
Roswell Park Cancer Institute
Other
Eligibility
21 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated May 21, 2026 · Synced Sep 7, 2026, 4:37 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Drug Effects on Preference and Reward

NCT01722006
View directory record Official record
Conditions
Drug Addiction
Interventions
Pairing condition
Behavioral
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 35 Years
Enrollment
103 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010 – 2012
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 4, 2013 · Synced Sep 7, 2026, 4:37 PM EDT