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Erectile DysfunctionsPhase 1NCT07732387

A Study to Assess the Safety, Tolerability and Pharmacokinetics of Viaca (Sildenafil + Cabergoline) Compared With Sildenafil and Cabergoline

A Phase 1 study testing Viaca, Sildenafil 50 mg and Cabergoline 0.5 MG in people with Erectile Dysfunctions and Healthy Volunteer, run by Yanping Kong at 1 site in Australia.

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Sites and contacts
Official record
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Trial summary

This is a Phase 1, open-label, single-ascending-dose study evaluating the safety, tolerability, and pharmacokinetics (PK) of Viaca - a fixed-dose oral combination of sildenafil (a PDE5 inhibitor) and cabergoline (a dopamine D2 agonist) - versus sildenafil monotherapy and cabergoline monotherapy in healthy adult male… Read more about this study

Who is it for?
Ages 18 to 65 years, men onlyHealthy volunteers can take part
Conditions the study is for
Erectile Dysfunctions, Healthy Volunteer
What is being tested?
Viaca, Sildenafil 50 mg and Cabergoline 0.5 MG
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
30 participants
Where
1 siteAustralia
Study dates
1 Aug 2026to 19 Sep 2026
Phase
Phase 1
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 65 years
  • Men only
  • Healthy volunteers accepted
  • Adult, Older adult

Who may be able to join

  • Male participants, aged 18 to 65 years (inclusive) at the time of informed consent.
  • In good general health (Investigator judgement) with no significant medical history and no clinically significant abnormalities on physical examination, vital signs, or 12-lead ECG - including systolic blood pressure 110-140 mmHg (inclusive) at Screening and Day -1 - at Screening and/or before first IP administration.
  • BMI ≥ 18.0 and ≤ 32.0 kg/m² and weight ≥ 50 kg.
  • Nonsmoker or casual smoker (< 5 cigarettes/week equivalent) with no tobacco use within 2 months prior to Screening (Investigator discretion).
  • Clinical laboratory values within normal range (or not clinically significant per Investigator).
  • Fertile men agree to acceptable contraception from Screening until 90 days after last IP dose, and no sperm donation from first dose until ≥ 90 days after last dose.
  • Able and willing to attend required study visits.
  • Able and willing to provide written informed consent before any study procedures.

Who cannot join

  • Physical or psychological condition that would impair protocol compliance or study completion (Investigator judgement).
  • History of, or condition that would contraindicate study medication or interfere with study evaluations (Investigator judgement).
  • Previous history of any of: myocardial infarction; cerebrovascular accident; arrhythmia; congestive heart failure; unstable angina; recent (<6 months) need for calcium-channel/beta-blocker/nitrate/anti-epileptic therapy; uncontrolled hypertension (SBP >140 or DBP >100 mmHg); hypotension (SBP <90 or DBP <60 mmHg) incl. syncope/orthostatic/vasovagal; pulmonary/pericardial/retroperitoneal fibrotic disorders; sickle-cell disease or trait; cardiac valve disease; severe psychiatric disorders; Raynaud's/vasospastic disorders; bariatric surgery (cholecystectomy acceptable).
  • Blood/plasma donation or significant blood loss (450 mL) within 30 days prior to first IP dose.
  • Fever (>38°C) or symptomatic viral/bacterial infection within 2 weeks prior to Screening.
  • Infections requiring parenteral antibiotics within 1 month prior to Screening.
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  • Concomitant use of an indwelling urethral catheter.
  • Concomitant nitrates/nitric-oxide donors, potent CYP3A4 inhibitors (e.g. ritonavir, indinavir, ketoconazole) or moderate inhibitors (e.g. erythromycin); unwilling to avoid St. John's wort and CYP3A4-active herbals (e.g. grapefruit) within 14 days prior and throughout the study.
  • Medications that significantly affect BP: nitrates (any form), alpha-blockers (e.g. doxazosin, terazosin, tamsulosin), guanylate cyclase stimulators (e.g. riociguat).
  • Positive HCV antibody, HBsAg, or HIV antibody.
  • Live vaccine within 4 weeks prior to first IP dose.
  • Poor pill-swallowing ability or poor venous access.
  • History of severe allergic/anaphylactic reactions or sensitivity to IP or constituents.
  • History of malignancy (except non-melanoma skin cancer excised >5 years prior to Screening).
  • Clinically significant abnormal Screening ECG (e.g. QRS ≥ 120 msec and/or QTcF > 450 msec, per Investigator).
  • History/evidence of renal disease or eGFR < 60 mL/min/1.73 m² at Screening (2021 CKD-EPI creatinine equation).
  • Immunosuppressive drug exposure (incl. experimental therapies) within 4 months or 5 half-lives (whichever longer) prior to Screening.
  • Positive urine toxicology panel (barbiturates, THC, amphetamines/methamphetamines, methadone, MDMA, phencyclidine, tricyclic antidepressants, benzodiazepines, opiates, cocaine) or positive alcohol breath test.
  • Unwilling to abstain from alcohol, caffeine and nicotine from 48 h prior to admission, during confinement, and 48 h prior to follow-up visits.
  • History of substance abuse/dependency or recreational IV drug use in the last 12 months (self-declared).
  • Unwilling to refrain from strenuous exercise (incl. weightlifting) 48 h prior to admission and follow-up visits.
  • Anything the Investigator considers would jeopardize participant safety, prevent full participation, or compromise data interpretation.

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Clinical Research Coordinator at Nucleus Network Brisbane contact

1800 243 733

brisbane@nucleusnetwork.com

Australia1 site
  • Nucleus Network Brisbane

    Herston, Queensland, 4006

Other trials in Australia

About this study

Official title: An Open-Label Single-Ascending Dose Study to Investigate the Safety, Tolerability and Pharmacokinetics of Viaca (Sildenafil + Cabergoline) Compared With Sildenafil and Cabergoline in Healthy Volunteers

This is a Phase 1, open-label, single-ascending-dose study evaluating the safety, tolerability, and pharmacokinetics (PK) of Viaca - a fixed-dose oral combination of sildenafil (a PDE5 inhibitor) and cabergoline (a dopamine D2 agonist) - versus sildenafil monotherapy and cabergoline monotherapy in healthy adult male volunteers. Approximately 30 participants are enrolled across 5 sequential cohorts (6 each). Each participant receives a single oral dose. The combination targets erectile dysfunction through both vascular and neuroendocrine pathways, aiming for efficacy at lower component doses.

Read the detailed description

Five cohorts of 6 healthy male participants each (n≈30). Viaca dose cohorts: Cohort 1 (25/0.25 mg), Cohort 2 (50/0.5 mg), Cohort 3 (75/0.75 mg). Active-comparator cohorts: Cohort 4 (sildenafil 50 mg) and Cohort 5 (cabergoline 0.5 mg). Cohort 1 runs first; after Safety Review Committee (SRC) review of safety/tolerability/PK through Day 3, Cohorts 2, 4 and 5 may proceed in parallel; Cohort 3 proceeds after SRC review of Cohort 2. Participants fast ≥8 h overnight before dosing and 2 h after. They are confined to a Phase 1 unit and discharged on Day 5 (Cohorts 1-3 and 5) or Day 2 (Cohort 4), with a follow-up visit on Day 8 (±1). Total participation ~33 days including screening. (V2.0 amendment removed the former optional high-dose Viaca cohort.)

Being tested
Viaca, Sildenafil 50 mg, Cabergoline 0.5 MG
Keywords
viaca, sildenafil, cabergoline, erectile dysfunction, PDE5 inhibitor, dopamine agonist, fixed-dose combination, single ascending dose, pharmacokinetics, healthy volunteers, Phase 1
Medical subject headings
Erectile Dysfunction

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • ViacaDrug

    fixed-dose oral tablet of sildenafil + cabergoline (low-dose 25/0.25 mg; high-dose 50/0.5 mg). Single oral dose.

  • Sildenafil 50 mgDrug

    single oral dose

  • Cabergoline 0.5 MGDrug

    single oral dose

Study groups in NCT07732387
Study groupRoleWhat they receive
Cohort 1: Viaca 25/0.25 mgExperimentalSingle oral dose of Viaca (sildenafil 25 mg / cabergoline 0.25 mg; one low-dose tablet) in 6 healthy male participants.
Receives: Drug: Viaca
Cohort 2: Viaca 50/0.5 mgExperimentalSingle oral dose of Viaca (sildenafil 50 mg / cabergoline 0.5 mg; one high-dose tablet
Receives: Drug: Viaca
Cohort 3: Viaca 75/0.75 mgExperimentalSingle oral dose of Viaca (sildenafil 75 mg / cabergoline 0.75 mg; one low + one high tablet
Receives: Drug: Viaca
Cohort 4: Sildenafil 50 mgActive comparatorSingle oral dose of sildenafil 50 mg (two 25 mg tablets).
Receives: Drug: Sildenafil 50 mg
Cohort 5: Cabergoline 0.5 mgActive comparatorSingle oral dose of cabergoline 0.5 mg (one 0.5 mg tablet).
Receives: Drug: Cabergoline 0.5 MG

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Participants with AEs/SAEs

    Number of participants with treatment-emergent adverse events (TEAEs) and serious adverse events (SAEs). Unit: participants (summarised by severity and relatedness).

    Measured: Day 1 (dosing) through Day 8

  2. Blood pressure

    Change from Baseline in systolic and diastolic blood pressure. Unit: mmHg.

    Measured: Baseline through Day 8.

  3. Pulse rate

    Change from Baseline in pulse rate. Unit: beats/min.

    Measured: Baseline through Day 8.

  4. Respiratory rate

    Change from Baseline in respiratory rate. Unit: breaths/min.

    Measured: Baseline through Day 8.

  5. Body temperature

    Change from Baseline in body temperature. Unit: °C.

    Measured: Baseline through Day 8.

  6. ECG heart rate

    Change from Baseline in 12-lead ECG heart rate. Unit: beats/min.

    Measured: Baseline through Day 8.

  7. ECG intervals

    Change from Baseline in 12-lead ECG intervals (QTcF, PR, QRS). Unit: milliseconds.

    Measured: Baseline through Day 8.

  8. Laboratory tests

    Number of participants with clinically significant safety laboratory abnormalities. Unit: participants.

    Measured: Baseline through Day 8.

  9. Physical examination

    Number of participants with clinically significant physical examination findings. Unit: participants.

    Measured: Baseline through Day 8.

Secondary outcomes (14)
  1. Cmax

    Maximum observed plasma concentration (Cmax). Unit: e.g. ng/mL.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  2. Tmax

    Time to maximum plasma concentration (Tmax). Unit: hours.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  3. AUC0-t

    Area under the plasma concentration-time curve from time 0 to the last measurable concentration (AUC0-t). Unit: e.g. ng·h/mL.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8)

  4. AUC0-24

    AUC from time 0 to 24 hours (AUC0-24). Unit: e.g. ng·h/mL.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  5. AUC0-inf

    AUC from time 0 extrapolated to infinity (AUC0-inf). Unit: e.g. ng·h/mL.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  6. %AUCextrap

    Percentage of AUC0-inf obtained by extrapolation (%AUCextrap). Unit: percentage.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  7. t½

    Apparent terminal elimination half-life (t½). Unit: hours.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  8. kel

    Terminal elimination rate constant (kel). Unit: 1/hour.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  9. CL/F

    Apparent total clearance after oral dosing (CL/F). Unit: e.g. L/h.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  10. Vz/F

    Apparent volume of distribution during the terminal phase after oral dosing (Vz/F). Unit: e.g. L.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  11. Cmax/D

    Dose-normalised maximum plasma concentration (Cmax/D). Unit: e.g. ng/mL per mg.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  12. AUC0-inf/D

    Dose-normalised AUC0-inf (AUC0-inf/D). Unit: e.g. ng·h/mL per mg.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  13. AUC0-t/D

    Dose-normalised AUC0-t (AUC0-t/D). Unit: e.g. ng·h/mL per mg.

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

  14. Dose proportionality

    Dose proportionality of Cmax and AUC across Viaca dose levels. Unit: e.g. slope (power-model estimate).

    Measured: Predose (Day 1) through 168 hours post-dose (Day 8).

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted28 Jul 2026
  2. Study start1 Aug 2026 (estimated)
  3. Primary completion19 Sep 2026 (estimated)
  4. Study completion19 Sep 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Basic science
Allocation
Non-randomised
Intervention model
Sequential
Masking
None (open label)
Enrolment
30 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07732387
Sponsor's protocol ID
CR-067-001
Other IDs
EC00372, 462/26
Status last verified
Jul 2026
First submitted
13 Jul 2026
Last updated
28 Jul 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Viaca, Sildenafil 50 mg and Cabergoline 0.5 MG in people with Erectile Dysfunctions and Healthy Volunteer, run by Yanping Kong at 1 site in Australia.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 8 inclusion and 22 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: opening soon, as of the sponsor's last update on 28 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Australia. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Clinical Research Coordinator at Nucleus Network Brisbane (1800 243 733, brisbane@nucleusnetwork.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Participants with AEs/SAEs (time frame: Day 1 (dosing) through Day 8). The study lists 9 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Jul 2026.

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