Effects of Yohimbine and Naltrexone on Sexual Function

This study has been completed.
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00042536
First received: July 31, 2002
Last updated: March 3, 2008
Last verified: April 2004

July 31, 2002
March 3, 2008
July 2002
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Complete list of historical versions of study NCT00042536 on ClinicalTrials.gov Archive Site
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Effects of Yohimbine and Naltrexone on Sexual Function
Effects of Alpha-2 Adrenergic and Opiate Receptor Blockade on Sexual Function in Healthy Male Volunteers

The purpose of this study is to evaluate the safety and effectiveness of the drugs yohimbine and naltrexone in treating men with erectile dysfunction (ED) (the inability to achieve or maintain penile erection for satisfactory sexual performance).

ED is a medical and psychological problem that is usually associated with increased age. Evidence suggests that specific neurotransmitter systems are involved in the regulation of sexual function. Yohimbine and naltrexone are drugs that may influence these neurotransmitter systems. This study will use different doses of yohimbine and fixed doses of naltrexone to determine their effectiveness in treating ED.

Participants in this study will be screened with a medical history, physical examination, blood and urine tests, and an electrocardiogram (ECG). The study will consist of three outpatient visists.

Erectile dysfunction (ED) is a relevant medical and psychological problem for males, and is usually associated with increased age. There is substantial evidence available suggesting that noadrenergic and opiate transmitter systems are involved in regulation of sexual function. The objective of the present study is to evaluate the effects and safety of a potential novel treatment combination for ED consisting of both, the alpha-adrenoreceptor antagonist yohimbine, and the opiate antagonist naltrexone. The study uses a three-phase, double-blind, placebo-controlled cross-over design. Healthy, male volunteers will participate. The effects of differing dosages of yohimbine (10 mg versus 20 mg) and a fixed dose of naltrexone (50 mg) on penile tumescene and rigidity, and sexual arousal are assessed in a placebo-controlled design. The anticipated risks of the study are considered minimal in relation to the importance of our increased knowledge about regulation of physiological and psychological aspects of regulation of sexual function and dysfunction. This novel treatment combination could be later also applied to patients with ED of different origin, e.g. organic, psychogenic, and mixed causes.

Observational
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Erectile Dysfunction
Drug: Naltrexone HCL/ Yohimbine HCL
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*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
40
April 2004
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INCLUSION CRITERIA

Subjects must be medically healthy and free of mental illness, take no medication, and must report no problems with their sexual function. They are required to be sexually active, including successful penetrative sexual intercourse acts.

For assessments of sexual function before and after the study subjects are required to complete a detailed daily diary recording their erectile activity for 7 days before the first study session, and for 7 days after completion of the study.

EXCLUSION CRITERIA

Persons having taken antidepressant or other medications likely to alter monoamine neurochemistry or cerebrovascular and cardiovascular function within 6 months prior to the study will be excluded.

Individuals will also be excluded if they have: a) evidence for an axis I psychiatric disorder (DSM-IV criteria), b) medical or neurological illnesses likely to affect physiology or anatomy, c) a history of drug (including BZDs) or alcohol abuse within 1 year or a lifetime history of alcohol or drug dependence (DSM IV criteria), d) smokers, e) diagnosis of a sexual disorder, f) criminal history.

Persons must exhibit no or only moderate alcohol use. Persons with current or previous regular use ( more than 4 weeks) of BZDs and excessive use of alcohol (more than 8 ounces/day) in the past or presence are ineligible to participate, as such drug use confound the results.

Individuals beyond age 50 are excluded because subjects beyond age 50 have a far greater likelihood of showing subtile, albeit clinical irrelevant disturbances in erectile function.

Male
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Yes
Contact information is only displayed when the study is recruiting subjects
United States
 
NCT00042536
020262, 02-M-0262
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National Institute of Mental Health (NIMH)
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National Institutes of Health Clinical Center (CC)
April 2004

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP