The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government.
Read our disclaimer for details.
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, Learn About Clinical Studies.
Ages Eligible for Study:
18 Years to 40 Years (Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Inclusion Criteria: Healthy men and women
current cardiac or other chronic diseases (e.g., cancer, diabetes, hypertension, kidney disease); routine use of prescriptive medications; history of vasovagal response to phlebotomy; an allergy to naltrexone; pregnancy; current smokers; current use of recreational drugs; history of substance abuse