Evaluate the Pharmacokinetics and Gonadotropin Suppression of Nestorone®-Testosterone (NES/T) Combination Gel in Men

A total of 45 subjects will be enrolled and randomized in a 2:1 ratio to one of two treatment groups. A description of each group is as follows:

• Group 1 (30 subjects): 5.0 mL of the 1.62% combined gel (containing 8.3 mg NES + 62.5 mg T) applied each day on the arms and shoulders
• Group 2 (15 subjects): 4.4 mL of the 1.62% AndrogelTM (containing 62.7 mg T) applied each day to the arms and shoulders

The total duration of treatment will be 28 days followed by a 72 hour sampling period to assess half-life and a recovery period of at least 28 days, at which point the subjects will return to the clinic for an end of study visit.

Inclusion criteria

• Male volunteers in good health as confirmed by physical examination, medical history, and clinical laboratory tests of blood and urine at the time of screening;
• 18 to 50 years of age;
• BMI < 33 calculated as weight in Kg/(height in cm)2;
• No history of hormonal therapy use in the last six months prior to the first screening visit;
• Subject will agree to use a recognized effective method of contraception with his partner (i.e. at a minimum, condom for the male partner and an effective contraception for the female partner) during the course of the study treatment and recovery phase;
• In the opinion of the investigator, subject is able to comply with the protocol, understand and sign an informed consent and HIPAA form;
• Does not meet any of the exclusion criteria.
• Sperm concentration ≥ 15 million sperm per milliliter ejaculate.

Exclusion criteria

• Men participating in another clinical trial involving an investigational drug within the last 30 days prior to the first screening visit;
• Men not living in the catchment's area of the clinic or within a reasonable distance from the site;
• Clinically significant abnormal physical findings at screening;
• Elevated PSA (levels ≥ 4 ng/mL), according to local laboratory normal values;
• Abnormal serum chemistry values, according to local laboratory normal values that indicate liver or kidney dysfunction or that may be considered clinically significant;
• Use of androgens or body building substances within 6 months before first screening visit;
• Diastolic blood pressure (DBP) > 80 and/or Systolic (SBP) > 130 mm Hg;
• EKG abnormal and clinically significant and QTC level longer than 450msec;
• History of hypertension, including hypertension controlled with treatment;
• Known history of primary testicular disease or disorders of the hypothalamic-pituitary axis;
• Known hypersensitivity to progestins or androgen;
• Family or personal history of venous thromboembolism;
• Benign or malignant liver tumors; active liver disease;
• Known history of reproductive dysfunction including vasectomy or infertility;
• Known history of cardiovascular, renal, hepatic or prostatic disease;
• A serious systemic disease such as diabetes mellitus or morbid obesity (body weight greater than 120% of ideal body weight or BMI limitation as above);
• Known or suspected alcoholism or drug abuse that may affect metabolism/transformation of steroid hormones and study treatment compliance;
• Known dermatitis or severe skin disorder;
• Moderate or severe depression as determined by PHQ-9 score >15;
• Partner is known to be pregnant;
• Known or suspected breast or prostate cancer;
• Allergic to any ingredient in testosterone/nestorone gel, including alcohol;
• Known history of untreated sleep apnea;
• International Prostate Symptom Score (IPSS) greater than or equal to 15.