A Randomized Controlled Clinical Trial: Hydroxychloroquine for the Treatment of COVID-19 in Hospitalized Patients (OAHU-COVID19)


Queen's Medical Center

Status and phase

Phase 3




Drug: Hydroxychloroquine

Study type


Funder types




Details and patient eligibility


This study is a randomized, open label clinical trial to evaluate the safety and efficacy of hydroxychloroquine (HCQ) plus usual care compared to usual care in approximately 350 hospitalized patients diagnosed with COVID-19. The study will be a 2-arm, non-blinded comparison between open label hydroxychloroquine and usual care. The course of treatment (HCQ) is five days. Participants will be followed to study day 28.

Full description

The overall objective is to evaluate the clinical efficacy and safety of hydroxychloroquine (HCQ) relative to standard of care among 350 hospitalized adult patients who have COVID-19.

Primary Aim i. Clinical status (on a 7-point ordinal scale) at day 15

Clinical Status 7-point ordinal scale:

Not hospitalized, no limitations on activities Not hospitalized, limitation on activities Hospitalized, not requiring supplemental oxygen Hospitalized, requiring supplemental oxygen Hospitalized, on non-invasive ventilation or high flow oxygen devices Hospitalized, on invasive mechanical ventilation or ECMO Death

After enrollment and randomization there will be baseline and then daily assessments of clinical status and test results and procedures during hospitalization. Course of HCQ treatment is 5 days. Participants are followed daily during hospitalization. All procedures, evaluations and treatment, including the hydroxychloroquine laboratory tests, and radiology tests are part of the usual clinical care for COVID-19 patients. This study will only collect the information obtained as part of hospital standard of care. If the information is not available, it will not be obtained by any other mechanism. After discharge there is a follow up telephone call at day 15 and day 28. Follow-up assessment includes any clinical events, adverse events, and clinic or emergency visits or hospitalizations. Participants in the HCQ arm have safety labs: CBC and Comprehensive Metabolic profile scheduled on day 7 and 14.


17 patients




18 to 95 years old


No Healthy Volunteers

Inclusion criteria

i. Subject (or legally authorized representative) provides written informed consent prior to initiation of any study procedures.

ii. Understands and agrees to comply with planned study procedures. iii. Male or female adult ≥18 - 95 years of age at time of enrolment. iv. Laboratory-confirmed SARS-CoV-2 infection in any specimen < 5 days prior to randomization.

v. At least one of the following:

  1. Radiographic infiltrates by imaging (chest x-ray, CT scan, etc.) or
  2. Clinical assessment (evidence of rales/crackles on exam) AND SpO2 ≤94% on room air vi. Women of childbearing potential must agree to use at least one primary form of contraception for the duration of the study.

Exclusion criteria

i. History of liver failure ii. History of stage 4 severe chronic kidney disease or requiring dialysis iii. Self-reported pregnant or breast feeding. iv. Allergy to hydroxychloroquine or choloroquine v. Known contraindication to hydroxychloroquine, including retinopathy, G6PD deficiency, QT prolongation

Trial design

Primary purpose




Interventional model

Parallel Assignment


None (Open label)

17 participants in 2 patient groups

Experimental group
Hydroxychloroquine 400 mg 2x day by mouth on day 1, followed by 200 mg 2x day by mouth days 2-5
Drug: Hydroxychloroquine
Usual Care
No Intervention group
usual care for hospitalized patients diagnosed with COVID-19

Trial contacts and locations



Data sourced from

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