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Drug Use and Addiction clinical trials recruiting in the U.S.

169 studies for Drug Use and Addiction are recruiting participants at sites across the United States.

Drugs include prescription and over-the-counter medicines, alcohol, tobacco, and illegal substances. Repeated drug use can change the brain and lead to addiction.

Cities with the most studies

• Baltimore, MD13 studies
• Houston, TX9 studies
• New York City, NY9 studies
• New Haven, CT8 studies
• Boston, MA7 studies
• Chicago, IL7 studies
• Charleston, SC7 studies
• Los Angeles, CA6 studies
• San Francisco, CA6 studies
• San Diego, CA6 studies
• Providence, RI5 studies
• Eugene, OR5 studies
• Dallas, TX5 studies
• Salt Lake City, UT5 studies
• Indianapolis, IN4 studies
• Minneapolis, MN4 studies
• Atlanta, GA4 studies
• Columbus, OH3 studies
• Seattle, WA3 studies
• Madison, WI3 studies
• St. Louis, MO3 studies
• Aurora, CO3 studies
• Washington, DC3 studies
• Oklahoma City, OK3 studies
• Cambridge, MA3 studies

By state

• Arizona6 studies
• Arkansas3 studies
• California21 studies
• Colorado4 studies
• Connecticut9 studies
• District of Columbia3 studies
• Florida8 studies
• Georgia6 studies
• Illinois8 studies
• Indiana4 studies
• Maryland14 studies
• Massachusetts15 studies
• Michigan6 studies
• Minnesota7 studies
• Missouri3 studies
• Montana3 studies
• New Jersey4 studies
• New York13 studies
• North Carolina4 studies
• Ohio5 studies
• Oklahoma4 studies
• Oregon6 studies
• Pennsylvania7 studies
• Rhode Island5 studies
• South Carolina8 studies
• Texas16 studies
• Utah5 studies
• Washington3 studies
• Wisconsin4 studies

Recently updated studies

From ClinicalTrials.gov, data retrieved Oct 5, 2026. Each study sets its own eligibility; the study team decides who can join.