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Testosterone drug JATENZO under safety spotlight for adrenal impact

NCT ID NCT06385509

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This Phase 4 study is checking whether JATENZO, a testosterone replacement drug, affects adrenal gland function in men with low testosterone (hypogonadism). About 110 men aged 18-65 will take JATENZO for 12 months. Researchers will measure cortisol levels after a stimulation test to see if adrenal problems develop.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
JATENZO (testosterone undecanoate)
What this could lead to
If successful, this study could confirm that JATENZO is safe for adrenal function in men with low testosterone, supporting its continued use.
What could go wrong
This is a small, open-label Phase 4 safety study, not designed to prove effectiveness. Results may not apply to all patients, and adrenal issues could still occur.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

110 people

The number who actually took part.

Started

May 2024

Expected to finish

Mar 2026

An estimate. End dates often move.

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 65 years

Sex

Male participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Subject must be a man 18 to 65 years of age, inclusive, with a previous clinical diagnosis of hypogonadism (signs/symptoms consistent with hypogonadism and a low T level as defined by established criteria at the time of diagnosis); subjects must also have at least 1 T level \< 300 ng/dL at either Screen 1 or Screen 2. 2. Subject must be naïve to androgen replacement therapy or washed out of prior androgen replacement therapies (wash out durations specified in exclusion criterion); that is, be willing to cease current T treatment, or currently not be taking T treatment. 3. Subject agrees as part of signed informed consent to remain off all forms of T, except for dispensed study drug, throughout the entire study. 4. Subject must have adequate venous access in the left or right arm to allow collection of blood samples. 5. Subject must be able and willing to provide written informed consent and comply with the trial protocol and procedures. Exclusion Criteria: * Subject will be excluded if 1 or more of the main exclusion is applicable: 1. Subject with a history of panhypopituitarism or multiple endocrine deficiencies (whether or not on stable doses of thyroid hormone and adrenal replacement hormones). 2. Subject with a current or prior history of AI. 3. Subject is currently receiving corticosteroids. 4. On the CST at Screen 3, the maximum serum total cortisol at both the 30- and 60-minute timepoint is ≤ 14 mcg/dL or has a baseline CBG outside the reference range. 5. Subject with a history of a short course (2 weeks or less) of any glucocorticoids within the past 3 months or anabolic steroids other than testosterone within the past 6 months. 6. Subject with a history of a protracted course of any glucocorticoid therapy (e.g., inhaled nasal steroids, inhaled oral steroids, topical steroids, injectable steroids such as joint injections) or anabolic steroids other than T. Enrolled subjects who take glucocorticoids while on study drug may be discontinued from the study at the discretion of the investigator in consultation with the sponsor. 7. Subject with a history of anabolic steroid abuse. 8. Subject with a diagnosis of hypogonadism who has received any topical (e.g., gel or patch), intranasal, or buccal T therapy within the previous 2 weeks, intramuscular T injection of short-acting duration (e.g., T enanthate, T cypionate) within the previous 4 weeks, intramuscular T injection of long-acting duration (e.g., AVEED®) within the previous 20 weeks, T implantable pellets (Testopel®) product within the previous 6 months or any prior use of an oral testosterone product. 9. Subject has received any drug as part of another research study within 30 days of initial dose administration in this study. 10. Subject has significant intercurrent disease (e.g., liver, kidney, inflammatory bowel disease, uncontrolled or poorly controlled heart disease, including hypertension, thromboembolism, congestive heart failure, or coronary heart disease, psychiatric illness, including severe depression), which in the opinion of the Investigator, would affect study participation or interpretation of study assessments. 11. Subject has untreated, severe obstructive sleep apnea. 12. Subject has clinically significant abnormal laboratory values, including serum transaminases \> 2 × upper limits of normal (ULN), serum bilirubin \> 1.5 × ULN (except subjects with Gilbert syndrome) and serum creatinine \> 1.5 × ULN. 13. Subject has a HCT value of \< 35% or \> 50%. 14. Subject has a history of polycythemia, either idiopathic or associated with TRT treatment. 15. Subject is diabetic with a glycosylated hemoglobin \> 8.5%. 16. Subject has a body mass index (BMI) ≥ 38 kg/m2. 17. Subject has had a recent (within 2 years) history of stroke, transient ischemic attack, or acute coronary event. 18. Subject has a mean (triplicate assessments) systolic blood pressure (sBP) \> 140 mm Hg and/or diastolic blood pressure (dBP) \> 90 mm Hg at screening (if prescribed antihypertensives, subject should be taking medications on the day of the screening visit with a sip of water). 19. Subject has had recent (within 2 years) history of angina or stent (coronary or carotid) placement. 20. Subject does not meet the requirements for concomitant medication as outlined below: 1. If hypertensive, on a stable dose of antihypertensive medication for \< 3 months 2. If diabetic, on a stable dose of oral medication for \< 2 months 3. If on anticonvulsant therapy, on a stable dose for \< 3 months 4. If on lipid lowering medications, on a stable dose for \< 3 months. Subject is expected to remain on a stable dose of lipid-lowering medication(s) throughout the study. 21. Subject has an abnormal prostate DRE (palpable nodules), elevated PSA (serum PSA \> 4.0 ng/mL), I-PSS \> 19 points at screening. 22. Subject has a history of, or current or suspected prostate cancer. 23. Subject has a history of, or current or suspected breast cancer. 24. Subject currently using a drug known to affect T levels, T metabolism or levels of T metabolites. These include: 5-alpha-reductase inhibitors (e.g., dutasteride, finasteride), estrogens, long-acting opioid analgesics (e.g., methadone hydrochloride, buprenorphine hydrochloride), human growth hormone (HGH) or over-the-counter supplements purported to "boost" testosterone, sexual function or improve prostate symptoms. 25. Subject use of dietary supplements such as saw palmetto or phytoestrogens and any dietary supplements that may increase total T, such as androstenedione or dehydroepiandrosterone within the previous 4 weeks. 26. Subject use of any over-the-counter "adrenal supplements". 27. Subject is not willing to stop all supplemental biotin 3 days prior to testing at intervals described in this protocol. 28. Subject currently using Megace, atypical anti-psychotics (e.g., clozapine, aripiorazole, asenapine, lumateperone, olanzapine, paliperidone, aripiprazole, ziprasidone, cariprazine, risperidone, pimavanserin, ioperidone, brexpiprazole, lurasidone, quetiapine) or chronic benzodiazepine use. 29. Subject has a history of abnormal bleeding tendencies or thrombophlebitis unrelated to venipuncture or intravenous cannulation within the previous 2 years. 30. Subject has history of abuse of alcohol or any drug substance within the previous 2 years. 31. Subject deemed to be a compliance risk or unlikely to keep clinic appointments. 32. Subject donated blood (≥ 500 mL) within the 12-week period before the initial study dose.

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Conditions

The condition(s) this trial relates to.

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Contacts and locations

Locations

  • AccuMed Research Associates

    Garden City, New York, 11530, United States

  • Alliance for Multispecialty Research

    Tempe, Arizona, 85281, United States

  • Alliance for Multispecialty Research

    Norfolk, Virginia, 23507, United States

  • Alpine Research Organization, Inc.

    Clinton, Utah, 84015, United States

  • Catawba Valley Medical Group, Inc.

    Hickory, North Carolina, 28602, United States

  • Centennial Medical Group

    Columbia, Maryland, 21045, United States

  • Clinical Investigation Specialists, Inc.

    Kenosha, Wisconsin, 53144, United States

  • Clinical Research Center of Florida

    Pompano Beach, Florida, 33060, United States

  • Clinical Trials Research

    Lincoln, California, 95648, United States

  • Epic Medical Research LLC

    DeSoto, Texas, 75115, United States

  • Global Health Clinical Trial Crop

    Miami, Florida, 33135, United States

  • Highland Clinical Research

    Salt Lake City, Utah, 84124, United States

  • Hillcrest Medical Research, LLC

    DeLand, Florida, 32720, United States

  • Integrated Clinical Research

    Tarzana, California, 91356, United States

  • Long Beach Research Institute, LLC

    Long Beach, California, 90805, United States

  • Piedmont Healthcare, PA

    Statesville, North Carolina, 28625, United States

  • Raleigh Medical Group

    Raleigh, North Carolina, 27609, United States

  • Renstar Medical Research

    Ocala, Florida, 34470, United States

  • Reserka LLC

    Miami, Florida, 33176, United States

  • Rochester Clinical Research, LLC

    Rochester, New York, 14609, United States

  • SMS Clinical Research LLC

    Mesquite, Texas, 75149, United States

  • VAST Clinical Research LLC

    Garland, Texas, 75041, United States

  • Velocity Clinical Research

    Savannah, Georgia, 31406, United States

  • Velocity Clinical Research

    Omaha, Nebraska, 68134, United States

  • Velocity Clinical Research

    Austin, Texas, 78759, United States

  • Velocity Clinical Research, Inc.

    Durham, North Carolina, 27701, United States

  • Wilmington Health, PLLC

    Wilmington, North Carolina, 28401, United States

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