Phlebotomy Study of Testosterone Undecanoate


Clarus Therapeutics

Status and phase

Phase 2
Phase 1




Drug: Oral Testosterone Undecanoate

Study type


Funder types




Details and patient eligibility


An open-label, single oral TU dose study was conducted in eight (8) hypogonadal men at a single study site. Each study participant received a single oral TU dose immediately prior to a standardized breakfast meal comprised of 800 to 1000 calories and approximately 30 g of fat. Blood samples were collected 30 minutes prior dose administration and at 0 pre-dose and post dose at the following hours post-dose; 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 hours.

Full description

This open-label, single oral dose, phlebotomy study was designed to clarify the issue of the influence of blood collection tubes on T, DHT, TU and DHTU measurements by collecting blood samples into various collection tubes from a small number of hypogonadal men dosed with a single oral TU dose in the form of a SEDDS formulation.


8 patients




18 to 65 years old


No Healthy Volunteers

Inclusion criteria

  1. Male, 18 to 65 years of age, inclusive, with a diagnosis of hypogonadism and a screening total serum T of < 300 ng/dL.
  2. Adequate venous access to allow blood sample collections via venous cannula.
  3. Naïve to androgen-replacement therapy or willing to temporarily cease current T treatment and willing to remain off all forms of T except for study medication throughout study.
  4. Voluntarily provide written informed consent to participate in this study.

Exclusion criteria

Subjects meeting any of the following exclusion criteria will not be eligible:

  1. Significant intercurrent disease (especially liver, kidney, heart disease, uncontrolled diabetes mellitus or psychiatric illness)
  2. Abnormal prostate digital rectal examination, elevated PSA (PSA > 4 ng/mL), AUA Symptom Score ≥ 15 points and/or history of prostate CA.
  3. BMI less than 18 kg/m2 or greater than 37 kg/m2
  4. Serum transaminases > 2 times upper limit of normal (ULN) or serum bilirubin >2.0 mg/dL.
  5. History of severe or multiple allergies, or severe adverse drug reaction. A known hypersensitivity to lidocaine or all surgical dressings which may be used in the study procedures.
  6. History of abnormal bleeding tendencies or thrombophlebitis unrelated to venipuncture or intravenous cannulation.
  7. Oral, topical or buccal T therapy within previous one week, or intramuscular T injection within previous 4 weeks.
  8. Parenteral T-undecanoate therapy within the past 6 months.
  9. Use of dietary supplements that may increase serum T, within previous 4 weeks.
  10. Known malabsorption syndrome and/or current treatment with oral lipase inhibitors, bile acid-binding resins, colestipol, fibric acid derivatives, clofibrate, gemfibrozil, and probucol.
  11. Smokers unable to refrain from smoking during required confinement period.
  12. History of, or current evidence of, abuse of alcohol or any drug substance.
  13. Receipt of any research study drug within 30 days of study.
  14. Blood donation within the 12 week period before the initial study dose.
  15. Hematocrit less than 35% or greater than 50%.
  16. History of clinically significant polycythemia following treatment with a testosterone replacement product.
  17. Current use of paroxetine, clomipramine, antiandrogens, estrogens, potent P450 enzyme inducers, or barbiturates.
  18. History of uncontrolled sleep apnea.

Trial design

Primary purpose

Basic Science



Interventional model

Single Group Assignment


None (Open label)

8 participants in 1 patient group

Oral Testosterone Undecanoate
Experimental group
A single dose of oral testosterone undecanoate equivalent to 200 mg of testosterone in the form of two soft gelatin capsules containing 158 mg of testosterone undecanoate will be administered to each subject.
Drug: Oral Testosterone Undecanoate

Trial contacts and locations



Data sourced from

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