Clinical trialNCT04328961CompletedPhase 2/PHASE3Interventional

Hydroxychloroquine for COVID-19 Post-exposure Prophylaxis (PEP)

SponsorUniversity of WashingtonEnrollment943COVID-19Corona Virus InfectionSARS (Severe Acute Respiratory Syndrome)SARS-CoV-2

View the registry record on ClinicalTrials.gov

Summary

The registered summary isn't in our current data snapshot. Read it on the ClinicalTrials.gov record ↗. Why? →

Investigators

The overall officials registered on this study. Names that resolve to a findmyKOL profile link to it; the rest are shown as registered.

Ruanne V. Barnabas, MBChB, DPhil
University of Washington
Principal Investigator
clinicaltrials.gov ↗

A profile link is shown only when the registered name resolves to a person record with a confident, namesake-checked match; ambiguous names stay unlinked.

Sites

8 registered facilities, with the per-site recruitment status where the registry publishes one. ClinicalTrials.gov does not publish per-site enrollment counts.

United States

University of California Los Angeles
Los Angeles, California, United States
Tulane
New Orleans, Louisiana, United States
University of Maryland, Baltimore
Baltimore, Maryland, United States
Boston University
Boston, Massachusetts, United States
Nyu Langone Health
New York, New York, United States
Suny Upstate Medical University
Syracuse, New York, United States
Uw Virology Research Clinic
Seattle, Washington, United States
University of Washington, Coordinating Center
Seattle, Washington, United States

Site investigator names are published by ClinicalTrials.gov only while a study recruits, so completed studies list sites without them.

Drugs studied

No drug or biological interventions are in our data for this study — it may test a procedure, device or behavioral intervention, or the intervention list isn't in our current snapshot. See the registry record ↗. Why? →

Registration & key dates

Registry attributes as recorded on the ClinicalTrials.gov study record.

Start: 31 Mar 2020
Primary completion: 24 Sept 2020
Completion: 8 Oct 2020
Last update posted: 16 Dec 2021
Registered enrollment: 943
Registry id: NCT04328961

clinicaltrials.gov ↗

Source: ClinicalTrials.gov, via the CTTI AACT database, data as of 12 Jul 2026. Registry facts are shown as registered by the study sponsor; findmyKOL does not interpret them.