28-Day Study of Testosterone Co-administered With Dutasteride in Hypogonadal Men

Inclusion criteria: * Have a diagnosis of primary or secondary hypogonadism. * Have very low testosterone levels on 2 separate days. * Have a BMI within range of 18.5-35kg/m2. * Have not taken dutasteride for one year, or finasteride for the past 3 months. Exclusion criteria: * Have had or have breast or prostate cancer, malabsorption syndrome, sleep apnea, psychiatric illness, polycythemia, or any other clinically significant current condition. * Are diabetic with an HbA1c \>= 8. * Are taking any androgens, such as testosterone, saw palmetto. * Are taking ritonavir, indinavir, itraconazole, ketoconazole, erythromycin, warfarin, digoxin, cholestyramine, or any dietary/herbal/vitamin supplements. * Would donate more than 500 ML of blood over a 2 month period. * Physician does not think it is a good idea for you to participate in the trial. - Are unwilling to abstain from alcohol during the study. * Have a positive urine drug screen test. * Plan to change your smoking habits during the course of the trial. * Have Hepatitis C, Hepatitis B, or HIV. * Have a lab or EKG abnormality. * High or low blood pressure. * Have used of any investigational drug or device during the study or within 30 days prior to 1st dosing of study medication.