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Combined Effects of Alcohol and Caffeine

Information source: Johns Hopkins University
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Alcohol or Other Drugs Effects

Intervention: Alcohol + Caffeine Beverage (Drug); Alcohol + Caffeine-placebo (Drug)

Phase: Phase 1

Status: Active, not recruiting

Sponsored by: Johns Hopkins University

Official(s) and/or principal investigator(s):
Roland R Griffiths, Ph.D., Principal Investigator, Affiliation: Johns Hopkins University


The purpose of this study is to investigate the effects of caffeine on the self-administration of alcohol. The study will also examine the combined effects of alcohol and caffeine on behavioral performance, participant ratings of behavioral performance, and self-reported subjective effects.

Clinical Details

Official title: Combined Effects of Alcohol and Caffeine

Study design: Endpoint Classification: Pharmacodynamics Study, Intervention Model: Single Group Assignment, Masking: Double Blind (Subject, Outcomes Assessor), Primary Purpose: Basic Science

Primary outcome: Total beverage consumed

Secondary outcome:

Circular Lights Task

The Biphasic Alcohol Effects Scale

Expired air breath alcohol measures

Subjective ratings 9-point likert scale

Subjective ratings visual analogue scale

Detailed description: The purpose of this study is to examine the effects of caffeine on alcohol self-administration. Volunteers will participate in 7 experimental sessions in which they will be given the opportunity to self-administer an alcohol + caffeine or alcohol + caffeine-placebo beverage. The first 6 sessions will involve exposure to the two beverage conditions in mixed order three times each (e. g., A, B, B, A, A, B). The seventh session will be a choice session in which the participant will make a single choice at the beginning of the session about which beverage they will consume that day. In addition to the primary outcomes of quantity of alcohol self-administered and beverage choice, three additional outcomes will be measured including: 1). indirect measures of reinforcing effects (e. g. subjective ratings of liking, well-being, take again); 2). an alcohol-sensitive behavioral measure; and 3). participant ratings of degree of behavioral impairment.


Minimum age: 21 Years. Maximum age: 50 Years. Gender(s): Both.


Inclusion Criteria:

- Very light or moderate consumer of caffeine (either daily or non-daily).

- Social drinker of alcohol.

- Has experience in lifetime of heavy alcohol consumption.

- Read, write, and speak English fluently.

Exclusion Criteria:

- Serious and unstable illnesses including current hepatic, renal, gastroenterologic,

respiratory, cardiovascular (including ischemic heart disease, uncontrolled hypertension, and congestive heart failure), endocrinologic, neurologic (including stroke, transient ischemic attack, subarachnoidal bleeding, brain tumor, encephalopathy, and meningitis), or hematologic disease.

- Parkinson's disease, seizure disorder, or history of significant head trauma.

- Current psychiatric illness

- Pregnant or nursing women or women who are not using an effective means of birth


Locations and Contacts

Behavioral Pharmacology Research Unit, Baltimore, Maryland 21224, United States
Additional Information

Starting date: January 2011
Last updated: March 30, 2015

Page last updated: August 23, 2015

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