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A Study of the Drug Interactions Between a Hormonal Emergency Contraception and an HIV Medication

This study has been completed.
The Miriam Hospital
University of Washington
Bristol-Myers Squibb
Information provided by (Responsible Party):
University of Colorado, Denver Identifier:
First received: June 5, 2007
Last updated: July 11, 2013
Last verified: July 2013
The purpose of this study is to determine if blood levels of the hormonal emergency contraceptive agent, Plan B, are altered by concomitant use with the HIV medication, efavirenz.

Condition Intervention Phase
HIV Infections
Drug: levonorgestrel, efavirenz
Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: A Pilot Study of the Pharmacokinetic Interactions Between the Hormonal Emergency Contraception, Plan B, and Efavirenz

Resource links provided by NLM:

Further study details as provided by University of Colorado, Denver:

Primary Outcome Measures:
  • The change in Plan B (levonorgestrel) Area under the Concentration Time Curve (AUC12) prior to and during steady state efavirenz [ Time Frame: 12 hour pharmacokinetic study ]

Secondary Outcome Measures:
  • Pharmacokinetic parameters of levonorgestrel prior to and during steady state efavirenz [ Time Frame: 12 hour pharmacokinetic study ]
  • Frequency of common levonorgestrel-associated adverse events prior to and during steady-state efavirenz [ Time Frame: 3 weeks ]
  • Changes in liver function tests before and during efavirenz [ Time Frame: 3 weeks ]
  • The efavirenz Area Under the Concentration Time Curve (AUC 24) in setting of levonorgestrel compared to historical controls [ Time Frame: 12 hour pharmacokinetic study ]

Enrollment: 24
Study Start Date: May 2007
Study Completion Date: December 2008
Primary Completion Date: December 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: levonorgestrel, efavirenz
healthy HIV-negative women of reproductive age were given levonorgestrel, efavirenz
Drug: levonorgestrel, efavirenz

Detailed Description:
The use of hormonal contraceptive pills in women with HIV is complex due to potential interactions between these agents and HIV medications. HIV-infected women taking efavirenz have an even greater need for effective birth control as this medication may cause severe brain damage to a developing fetus. The use of an emergency contraceptive agent in cases of unprotected sex or condom failure can prevent pregnancy. This study seeks to establish that Plan B can be used effectively and safely in women taking efavirenz.

Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy, HIV-1 seronegative women of child-bearing age.

Exclusion Criteria:

  • Current use of hormonal contraception
  • Pregnancy/Breast Feeding
  • Post-menopausal status
  • Obesity
  • Hepatitis B or C
  • Psychiatric illness
  • Active Substance Abuse
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00482963

United States, Colorado
University of Colorado Health Sciences Center
Denver, Colorado, United States, 80262
United States, Rhode Island
The Miriam Hospital
Providence, Rhode Island, United States, 02906
Sponsors and Collaborators
University of Colorado, Denver
The Miriam Hospital
University of Washington
Bristol-Myers Squibb
Principal Investigator: Monica L Carten, MD University of Colorado, Denver
  More Information

Responsible Party: University of Colorado, Denver Identifier: NCT00482963     History of Changes
Other Study ID Numbers: 06-1178
Study First Received: June 5, 2007
Last Updated: July 11, 2013

Keywords provided by University of Colorado, Denver:
Antiretroviral agents

Additional relevant MeSH terms:
HIV Infections
Lentivirus Infections
Retroviridae Infections
RNA Virus Infections
Virus Diseases
Sexually Transmitted Diseases, Viral
Sexually Transmitted Diseases
Immunologic Deficiency Syndromes
Immune System Diseases
Disease Attributes
Pathologic Processes
Reverse Transcriptase Inhibitors
Nucleic Acid Synthesis Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Anti-Retroviral Agents
Antiviral Agents
Anti-Infective Agents
Cytochrome P-450 CYP2C9 Inhibitors
Cytochrome P-450 Enzyme Inhibitors
Cytochrome P-450 CYP2C19 Inhibitors
Cytochrome P-450 CYP2B6 Inducers
Cytochrome P-450 Enzyme Inducers
Cytochrome P-450 CYP3A Inducers
Contraceptive Agents, Female
Contraceptive Agents
Reproductive Control Agents processed this record on April 28, 2017