Phase 2 Efficacy Study of Sildenafil Products in Adult Men With Erectile Dysfunction

This Phase 2, open-label, parallel-group clinical trial evaluates the real-world use of multiple sildenafil-based erectile dysfunction (ED) treatments, including two oral liquid formulations (Hezkue® and Hezkue Turbo®) and several commercially available tablet, chewable, or combination (sildenafil/tadalafil) products. The study is designed to characterize differences in erectile function outcomes, safety profiles, and patient-reported treatment experiences across these products when used on an on-demand basis.

The trial includes a screening period of up to 28 days, followed by 12 weeks of treatment with one assigned product. Participants will use electronic diaries and questionnaires to record sexual-encounter outcomes, timing of effects, treatment satisfaction, and other patient-reported measures. Safety evaluations include adverse event monitoring, vital signs, clinical laboratory assessments, and targeted cardiovascular, ophthalmologic, and otologic examinations.

The design reflects typical on-demand PDE5 inhibitor use and enables comparative assessment across distinct formulations and delivery systems (liquid spray, orodispersible/chewable, and standard tablets). Exploratory analyses will examine work productivity, activity impairment, healthcare utilization, and optional partner-reported measures to better understand the broader impact of ED treatment in daily life.

This description supplements, but does not repeat, information provided in the Brief Summary, Eligibility, or Outcome Measures sections.

Inclusion criteria

• Male, 18 to 70 years of age.

Documented diagnosis of erectile dysfunction (ED) for at least 3 months, confirmed by a clinician.

Baseline International Index of Erectile Function-Erectile Function (IIEF-EF) domain score ≤25.

Sexually active and attempting sexual intercourse at least 4 times per month during the 3 months prior to screening.

Willing and able to attempt sexual intercourse at least once per week during the study.

Judged by the Investigator to be in good general health other than ED.

Creatinine clearance (CrCl) >80 mL/min as calculated by Cockcroft-Gault.

Able and willing to comply with all study procedures, including use of eDiary/ePRO tools and adherence to dosing instructions.

Exclusion criteria

• Use of nitrates or nitric oxide donors in any form.

Use of prohibited antihypertensive medications as defined in the protocol.

Use of phosphodiesterase type 5 (PDE5) inhibitors within 5 days prior to baseline.

Use of CYP450 inhibitors within 14 days prior to first dose.

Use of CYP450 inducers or St. John's Wort within 28 days prior to first dose.

Use of any prescription or non-prescription medications, herbal products, or dietary supplements not approved by the Investigator during the required restriction period.

Known hypersensitivity to sildenafil, tadalafil, vardenafil, peppermint oil, or any component of the investigational product.

Clinically significant abnormalities in screening laboratory tests, vital signs, or electrocardiograms, as judged by the Investigator.

Any hepatic impairment or abnormal liver function test results at screening.

Positive screening test for hepatitis B surface antigen, hepatitis C antibody, or HIV.

Clinically significant illness within 30 days prior to the first dose.

Significant cardiovascular disease, including recent myocardial infarction, unstable angina, uncontrolled hypertension, or severe arrhythmias.

History of stroke or neurological disorder that may affect sexual function.

Severe psychiatric disorder or substance abuse that may interfere with study participation.

Anatomical penile deformity (such as Peyronie's disease) that may interfere with erectile function assessments.

Positive urine drug screen for amphetamines, barbiturates, benzodiazepines, cocaine, opiates, phencyclidine (PCP), or MDMA.

Alcohol consumption exceeding 15 units per week.

Initiation of new nicotine products during the study period.

Participation in another clinical trial (other than Hezkue/Hezkue Turbo studies) within 30 days prior to screening.

Blood donation or significant blood loss within 3 months prior to screening, or plasma donation within 14 days prior to screening.

Major surgery within 3 months or minor surgery within 1 month before screening.

Consumption of Seville oranges, grapefruit, or pomelo within 7 days before dosing.

Resting systolic blood pressure outside 90-140 mmHg, diastolic blood pressure outside 50-90 mmHg, or heart rate outside 50-100 beats per minute at screening.

Sexual partner is pregnant or unwilling to use effective contraception during the study.

Any condition that, in the Investigator's opinion, would make the participant unsuitable for the study.

Institutionalized individuals.