CI

At a glance

ClinicalIndex Comparison Record
Phase 2Completed· 49 enrolled
Drug / intervention
GDC-6599 +2 moredrug
Likely dose
Not stated in record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT05660850
NCT05660850Phase 2Completed

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

Genentech, Inc.·interventional·Posted Dec 21, 2022·Updated Dec 16, 2025

In Brief

A Phase 2 clinical trial evaluating GDC-6599, GDC-6599-matching placebo, and 1 other intervention for Chronic Refractory Cough (CRC) With Non-atopic Asthma and 4 related conditions. Completed, enrolled 49 participants across 18 sites in 4 countries.

Detailed Summary

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 Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
CountriesAustralia, Canada, United Kingdom, United States
Collaborators--

Timeline

Phase 2CompletedFinished
2023202420252026
First PostedDec 21, 2022
Enrollment StartMar 22, 2023
Primary CompletionOct 20, 2024
TodayJul 2, 2026
Enrollment to primary: 1.6 yearsPosted 3.5 years ago

Interventions

GDC-6599drug

GDC-6599 will be administered Days 1- 14 and on Days 29-42 as film-coated tablets

GDC-6599-matching placeboother

GDC-6599-matching placebo will be administered Days 1- 14 and on Days 29- 42. as film-coated tablets

Mannitolother

Mannitol challenge tests will be performed during screening and at least 2.5 hours following study drug administration at Study Visits 2, 4, 5 and 7