| NCT Number | Conditions | Interventions | Sponsor/Collaborators | Phases | Start Date | Last Updated |
| NCT01571167 | Methamphetamine Dependence|Methamphetamine Abuse|Substance Abuse | Drug: Placebo|Drug: Varenicline|Drug: Varenicline | Baylor College of Medicine|National Institute on Drug Abuse (NIDA) | Phase 1 | 2011-01-01 | 2013-06-12 |
| NCT00895557 | Varenicline and the Blunting of Cocaine Cues | Drug: chantix | University of Pennsylvania|National Institute on Drug Abuse (NIDA) | Phase 2 | 2007-12-01 | 2016-09-06 |
| NCT00813800 | Smoking|Bipolar Disorder|Depression | Drug: Varenicline | Mark Frye|Pfizer|Mayo Clinic | | 2009-01-01 | 2011-12-23 |
| NCT00860028 | Nicotine Dependence|Smoking|Heavy Drinking | Drug: Varenicline | Yale University|National Institute on Alcohol Abuse and Alcoholism (NIAAA) | Phase 2 | 2008-10-01 | 2013-01-28 |
| NCT00661765 | Smoking Cessation | Drug: varenicline tartrate|Drug: varenicline free base | Pfizer | Phase 1 | 2008-04-01 | 2009-04-22 |
| NCT01010204 | Smoking Cessation|Bipolar Disorder | Drug: Varenicline (Chantix)|Drug: Placebo | University of Pittsburgh|National Institute of Mental Health (NIMH)|Pfizer | Phase 4 | 2010-01-01 | 2015-04-07 |
| NCT01341080 | Parkinson Disease | Drug: Varenicline|Drug: Sugar pill | Rush University Medical Center | Phase 2 | 2010-11-01 | 2014-07-15 |
| NCT00733967 | Methamphetamine Dependence|Substance Abuse|Methamphetamine Abuse | Drug: Varenicline|Drug: Placebo | Baylor College of Medicine|National Institute on Drug Abuse (NIDA) | Phase 1 | 2008-01-01 | 2012-07-25 |
| NCT00525837 | Depressive Disorder|Smoking | Drug: fixed dose varenicline|Drug: varenicline | Butler Hospital|Brown University | | 2007-09-01 | 2014-10-03 |
| NCT01632189 | Nicotine Dependence | Drug: Varenicline | Centre for Addiction and Mental Health|Ontario Lung Association|Pfizer | | 2012-09-01 | 2016-01-26 |
| NCT00948155 | Nicotine Dependence | Drug: Varenicline | University of Pennsylvania|Pfizer | Phase 4 | 2009-01-01 | 2014-12-15 |
| NCT01228175 | Smoking Addiction | Drug: Placebo|Drug: Varenicline | The Mind Research Network|National Institute on Drug Abuse (NIDA) | Phase 4 | 2010-03-01 | 2016-09-16 |
| NCT00602927 | Nicotine Dependence | Drug: Varenicline|Drug: Placebo | University of Pennsylvania|Pfizer|National Cancer Institute (NCI) | | 2007-11-01 | 2011-05-06 |
| NCT01387425 | Smoking Cessation|Diabetes | Drug: varenicline|Drug: placebo tablet is made of lactose | Universita degli Studi di Catania | | 2011-06-01 | 2015-12-01 |
| NCT01378858 | Tobacco Use Disorder|Medication Adherence | Behavioral: Varenicline treatment as usual or directly observed therapy | Albert Einstein College of Medicine, Inc.|National Institute on Drug Abuse (NIDA) | | 2011-07-01 | 2015-01-14 |
| NCT01347112 | Smoking|Tobacco Dependence|Alcohol Dependence | Drug: Varenicline|Drug: placebo | Mayo Clinic | Phase 2|Phase 3 | 2011-06-01 | 2014-05-01 |
| NCT00731562 | Pharmacokinetics|Bioavailability|Smoking Cessation | Drug: Varenicline Tartrate Controlled Release|Drug: Varenicline Tartrate Controlled Release | Pfizer | Phase 1 | 2008-07-01 | 2010-01-07 |
| NCT01092702 | Tobacco Abstinence | Drug: Varenicline | Mayo Clinic | Phase 2|Phase 3 | 2008-04-01 | 2011-04-15 |
| NCT00749944 | Smoking Cessation | Drug: varenicline|Drug: placebo | Pfizer | Phase 4 | 2008-09-01 | 2010-08-24 |
| NCT01934023 | Schizophrenia | Drug: Varenicline|Drug: Placebo | Centre for Addiction and Mental Health|Pfizer | Phase 2 | 2013-09-01 | 2015-08-24 |
| NCT01061710 | Smoking Cessation | Drug: varenicline | Pfizer | Phase 4 | 2010-07-01 | 2015-01-27 |
