Conditions: Healthy Males Male Contraceptive
Keywords: 5α-reductase androgen dihydrotestosterone (DHT) drug delivery oestradiol
Allocation: RANDOMIZED | Intervention model: CROSSOVER
Enrollment: 11
Healthy volunteers: yes

Brief summary:
The purpose of this study is to test how the body absorbs and processes new forms of oral testosterone. Information gained during the study may help develop better forms of testosterone therapy in the future.

Detailed description:
We will be using three drugs: The first, acyline, temporarily turns off the body's production of testosterone for about two weeks. Subjects will receive acyline as shots three times over a six-week drug administration period. During the time when the body's production of testosterone is turned off, we will give testosterone either by itself or with a medication called finasteride by mouth twice daily for one week to see how much is absorbed and present in the bloodstream after administration. Subjects will go through three one-week study drug exposure periods. During two of the three one-week study drug administration periods subjects will also take a second medication, finasteride, by mouth twice daily. On the last day of each one-week drug administration period, subjects will be admitted to the University of Washington General Clinical Research Center overnight for monitoring of your blood testosterone levels. There will be 3 overnight visits for this study. This study will allow us to determine the absorption of testosterone taken by mouth, and the relative impact of two different doses of oral finasteride on testosterone absorption.

Arms:
arm 1: Acyline 300mcg/kg subcutaneous on days 1, 15 and 29 + Testosterone Undecanoate (TU)200mg twice daily, orally for 7 days + placebo finasteride twice daily, orally for 7 days during one of the three intervention periods (First Intervention, Second Intervention or Third Intervention) arm 2: Acyline 300mcg/kg subcutaneous on days 1, 15 \& 29 + testosterone undecanoate 200mg, twice daily orally for 7 days + finasteride 0.5mg twice daily, orally for 7 days during one of the three intervention periods (First Intervention, Second Intervention or Third Intervention) arm 3: Acyline 300mcg/kg subcutaneous on days 1, 15 \& 29 + testosterone undecanoate 200mg, twice daily orally for 7 days + finasteride 1mg twice daily, orally for 7 days during one of the three intervention periods ((First Intervention, Second Intervention or Third Intervention)

Interventions: intervention 1: First Intervention (7 days) intervention 2: First Washout (7 days) intervention 3: Second Intervention (7 days) intervention 4: Third Intervention (7 days) intervention 5: Second wash-out period
Intervention descriptions: intervention 1: Acyline 300mcg/kg subcutaneous (days 1, 15 \& 29) + testosterone undecanoate 200 mg, twice daily orally + finasteride placebo intervention 2: Washout of 7 days between each of the 3 treatment arms intervention 3: Acyline 300mcg/kg subcutaneous + testosterone undecanoate 200 mg, twice daily orally + finasteride 0.5mg twice daily, orally intervention 4: Acyline 300mcg/kg subcutaneous + testosterone undecanoate 200 mg, twice daily orally + finasteride 1mg twice daily, orally intervention 5: Washout of 7 days between each of the 3 treatment arms

Protocol document: