Study to Evaluate the Effect of a Single Oral Dose of Zoliflodacin 3 g on Testicular Function in Healthy Adult Men

Inclusion Criteria:

1. Man with good general health status, as determined by medical history, physical examination, screening laboratory tests, vital signs (including temperature), and clinical judgment
2. Age 18 to 45 years at informed consent
3. Weight ≥35 kg at Screening
4. Laboratory results at Screening, including FSH, LH, and total testosterone, within laboratory reference ranges

5. Semen parameters for each semen sample collected during Screening meeting the following criteria (WHO 2021):

   • sperm concentration ≥16 million/mL
   • semen volume ≥1.4 mL
   • total sperm per ejaculate ≥39 million
   • progressive motility ≥ 30%
   • sperm morphology : normal forms ≥4%
6. Willingness to use a highly effective form of contraception with female sexual partners of reproductive potential for 3 months after the last study drug dose
7. Provision of written informed consent
8. Willingness to participate and comply with all aspects of the trial through the entire trial period

Exclusion Criteria:

1. History of male reproductive health issues including, but not limited to, known hypothalamic-pituitary disorders (e.g., pituitary macroadenomas, pituitary infarction, hyperprolactinemia, panhypopituitarism), primary hypogonadism (e.g., cryptorchidism, Klinefelter's syndrome), Grade III varicocele, testicular torsion, orchitis, unilateral orchiectomy, or prostate gland pathology
2. Prior diagnosis of male impaired fertility (including reduced fertility)
3. History of antisperm antibodies
4. History of radiation to the testicles
5. History of clinically significant trauma to or surgery on the scrotum or testicles, including vasectomy
6. Known hypersensitivity to zoliflodacin or formulation excipients
7. Disorders of sperm transport including, but not limited to, retrograde ejaculation and immotile cilia syndrome
8. Sexual dysfunction of a nature that would prevent sperm collection in accordance with the protocol requirements (phosphodiesterase inhibitor use is permitted)
9. Uncontrolled thyroid dysfunction (e.g., untreated hypothyroidism or hyperthyroidism)
10. Any chronic medical or psychiatric condition that, in the opinion of the investigator, may harm the participant or make the participant unsuitable for the trial or would prevent compliance with the trial protocol procedures
11. History of major surgery or trauma within 4 weeks before Day 1 or anticipated need for major surgery during the trial
12. Febrile illness within 4 weeks before Screening
13. Clinically significant urinary tract infection, prostatitis, epididymitis, or STI diagnosed or treated within 4 weeks before Screening
14. Genitourinary sign or symptom indicative of a current STI (urethral discharge, dysuria, or genital lesion) at Screening or Day 1
15. Positive nucleic acid amplification test (NAAT) result for N gonorrhoeae at Screening
16. Positive serologic test for HIV-1 or HIV-2 antibody, hepatitis B surface antigen, or hepatitis C antibody or for any other pathogen tested according to the trial site standards for blood and semen handling

17. Use within 13 weeks before Screening of or anticipated need during the trial for a medication known to affect spermatogenesis or reproductive hormone regulation including, but not limited to, the following medications:

    • testosterone
    • gonadotropin analogues
    • anabolic steroids
    • antiandrogens (e.g., spironolactone, finasteride, dutasteride, ketoconazole)
    • 5-α reductase inhibitors
    • α-1 blockers
    • chemotherapeutic agents
    • chronic (≥90 days) use of opioids
    • other hormone-modulating medications
18. Use within 14 days before Day 1 of a moderate or strong cytochrome P450 isoenzyme 3A4 (CYP3A4) inducer (e.g., rifampin, carbamazepine, phenytoin, St. John's Wort) or anticipated need for moderate or strong CYP3A4 inducers from Day 1 to Day 3
19. Current tobacco use of ≥1 pack/day or equivalent
20. Current alcohol use >5 units per week
21. Known or suspected drug abuse
22. A positive drug or alcohol screen result at Screening or Day 1 visit
23. Participation in an interventional clinical study within 30 days or 5 half-lives of the study drug, whichever is longer, before Day 1 -