A Study To Evaluate The Efficacy, Safety, Pharmacokinetics, And Pharmacodynamic Effects Of GDC-6599 In Patients With Chronic Cough
Public ClinicalTrials.gov record NCT05660850. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A Phase IIa, Multicenter, Randomized, Double-Blind, Placebo-Controlled, Crossover Study To Evaluate The Efficacy, Safety, Pharmacokinetics, And Pharmacodynamic Effects Of GDC-6599 In Patients With Chronic Cough
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
This Phase IIa, multicenter, randomized, double-blind, placebo-controlled, crossover study will evaluate the efficacy, safety, pharmacokinetics, and pharmacodynamic (PD) effects of GDC-6599 compared with placebo in patients with a history of chronic cough.
Study identification
- NCT ID
- NCT05660850
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 2
- Enrollment
- 49 participants
Conditions and interventions
Conditions
Interventions
- GDC-6599 Drug
- GDC-6599-matching placebo Other
- Mannitol Diagnostic Test
Drug · Other · Diagnostic Test
Eligibility (public fields only)
- Age range
- 18 Years to 80 Years
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Mar 21, 2023
- Primary completion
- Oct 19, 2024
- Completion
- Oct 19, 2024
- Last update posted
- Dec 15, 2025
2023 – 2024
United States locations
- U.S. sites
- 8
- U.S. states
- 7
- U.S. cities
- 8
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Southern California Institute For Respiratory | Los Angeles | California | 90048 | — |
| California Medical Research Associates, Inc. | Northridge | California | 91324 | — |
| Pioneer Clinical Studies | Coral Gables | Florida | 33134 | — |
| Mayo Clinic | Rochester | Minnesota | 55905 | — |
| Clinical Research Associates Of Central Pa , Llc | DuBois | Pennsylvania | 15801-2277 | — |
| ADAC Research PA | Greenville | South Carolina | 29607 | — |
| Pharmaceutical Research & Consulting, Inc. | Dallas | Texas | 75231 | — |
| Bellingham Asthma, Allergy & Immunology | Bellingham | Washington | 98225 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
Non-U.S. locations
This page focuses on the U.S. directory. The official record also lists 10 non-U.S. sites.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT05660850, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Dec 15, 2025 · Synced Sep 3, 2026
Related: full search, browse by condition, browse by drug or therapy, browse by sponsor, browse by U.S. city.
Open the official record
The complete protocol, eligibility criteria, and contact information for NCT05660850 live on ClinicalTrials.gov.