A Clinical Trial Evaluating the Efficacy and Safety of Leflutrozole on Testicular Function in Men With Hypogonadotropic Hypogonadism

Launched by REPRONOVO APS · May 19, 2025

Keywords

ClinConnect Summary

This clinical trial is looking at a medication called leflutrozole to see if it can improve semen quality in men who have a condition known as hypogonadotropic hypogonadism, which means their hormone levels are low and it affects their fertility. The trial will test three different doses of the drug and compare its effects to a placebo, which is a substance that looks like the drug but has no active ingredients. The main goals are to find out if leflutrozole helps improve semen quality and if there are any side effects when taking it.

To be eligible for this trial, participants must be men aged 18 to 49 years who have low testosterone levels and certain hormone levels within specific ranges. They will take leflutrozole or the placebo once a week for 16 weeks and will need to visit the clinic every four weeks for checkups and to provide semen samples. Blood tests will also be done to monitor hormone levels and check for safety. It's important for potential participants to understand that they cannot have certain medical conditions or have taken specific medications recently that could interfere with the study.

Gender

MALE

Eligibility criteria

• Inclusion Criteria:
• • Signed informed consent form prior to any-related trial activity.
• • Adult men aged 18-49 years (both inclusive).
• • Low serum total testosterone concentration on two occasions.
• • Serum Sex Hormone Binding Globulin within or above normal range at screening.
• • Serum estradiol (E2) level within or above normal range at screening.
• • Serum Luteinizing Hormone level within or below normal range at screening.
• • Low total motile sperm count in two samples.
• • Semen volume ≥1.0 mL in two samples.
• • Ability to understand and comply with the requirements of the protocol.
• Exclusion Criteria:
• • Anatomical abnormalities of the testes or malignant or benign tumors of the testes.
• • Pituitary or hypothalamic disease.
• • Prostate disease.
• * Treatment with one or more of the following prescription drugs or over-the-counter medications or supplements for 6 months prior to the screening visit:
• • 1. Compounds with androgenic or estrogenic properties (i.e., agonist or antagonist) or that affect production of sex hormones.
• • 2. 5-α reductase inhibitors, e.g., finasteride and dutasteride.
• • 3. Fertility drugs, including clomiphene, FSH, hMG and hCG preparations.
• • 4. Growth hormone.
• • 5. Opioid-receptor antagonists, e.g., naloxone and long-acting opioids.
• • 6. Selective α-adrenergic-receptor antagonists (alpha blockers).
• • 7. Topical or systemic testosterone replacement therapy (TRT).
• • 8. Anabolic steroids.
• • Inability to reliably produce the required semen samples for trial assessments due to significant erectile dysfunction, anorgasmia, or other reasons.
• • Participation in any clinical trial using clinical intervention within 3 months before the screening visit or 5 half-lives of investigational product administration, whichever is shorter.
• • Any clinically significant 12-lead ECG abnormalities at screening.
• • Known history of thromboembolic disease.
• • Grade 3 lower extremity edema.
• • Known cardiovascular disease.
• • Known history of osteoporosis or fragility fractures.
• • Known moderate or severe impairment of renal or hepatic function.
• • Untreated diagnosis of sleep apnea.
• • History of cancer within the last 5 years.
• • Known alcohol and/or drug abuse within the last 12 months prior to randomization or evidence of such abuse indicated by the laboratory results during the screening assessments.
• • Known chronic opioid use and/or misuse within the last 12 months prior to randomization.
• • Any psychiatric or medical disorder or circumstance, which in the investigator's opinion might jeopardize participant's safety or compliance with the protocol.
• • Hypersensitivity to any active ingredients or excipients in the medicinal products used in this trial.