Trial reportAnnals of internal medicine2020
Hydroxychloroquine in Nonhospitalized Adults With Early COVID-19 : A Randomized Trial.
Trial report in Annals of internal medicine, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. It is linked to 3 registered trials, which are not on this map. Cited by 301 papers, 36 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Post-exposure Prophylaxis or Preemptive Therapy for SARS-Coronavirus-2: A Pragmatic Randomized Clinical Trial
Preemptive Therapy for SARS-Coronavirus-2 (COVID-19 PEP Canada)
A Double-blind Placebo-controlled Study to Assess the Efficacy and Safety of Oral Tafenoquine Versus Placebo in Patients With Mild to Moderate COVID-19 Disease
Who cites it
301 citing papers in PubMed, 36 syntheses or guidelines pooled it, 546 citations in OpenAlex.
- Drug treatments for mild or moderate covid-19: systematic review and network meta-analysis.BMJ (Clinical research ed.) · 2025Pooled it
- Outpatient randomized controlled trials to reduce COVID-19 hospitalization: Systematic review and meta-analysis.Journal of medical virology · 2023Pooled it
- Pan-American Guidelines for the treatment of SARS-CoV-2/COVID-19: a joint evidence-based guideline of the Brazilian Society of Infectious Diseases (SBI) and the Pan-American Association of Infectious Diseases (API).Annals of clinical microbiology and antimicrobials · 2023Guideline
- Pooled it
- Hydroxychloroquine for treatment of non-hospitalized adults with COVID-19: A meta-analysis of individual participant data of randomized trials.Clinical and translational science · 2023Pooled it
- Hydroxychloroquine for Non-Hospitalized COVID-19 Patients: A Systematic Review and Meta-Analysis of Randomized Clinical Trials.Arquivos brasileiros de cardiologia · 2023Pooled it
- Using time-weighted average change from baseline of SARS-CoV-2 viral load to assess impact of hydroxychloroquine as postexposure prophylaxis and early treatment for COVID-19.Journal of medical virology · 2022Pooled it
- Systematic review and meta-analysis of ivermectin for treatment of COVID-19: evidence beyond the hype.BMC infectious diseases · 2022Pooled it
- Comparative effectiveness of pharmacological interventions on mortality and the average length of hospital stay of patients with COVID-19: a systematic review and meta-analysis of randomized controlled trials.Expert review of anti-infective therapy · 2022Pooled it
- Fluvoxamine for Outpatient Management of COVID-19 to Prevent Hospitalization: A Systematic Review and Meta-analysis.JAMA network open · 2022Pooled it
- Pooled it
- The Fragility of Statistically Significant Results in Randomized Clinical Trials for COVID-19.JAMA network open · 2022Pooled it
- Hydroxychloroquine in the treatment of coronavirus disease 2019: Rapid updated systematic review and meta-analysis.Reviews in medical virology · 2022Pooled it
- Hydroxychloroquine/chloroquine for the treatment of hospitalized patients with COVID-19: An individual participant data meta-analysis.PloS one · 2022Pooled it
- Hydroxychloroquine for treatment of COVID-19 patients: a systematic review and meta-analysis of randomized controlled trials.Einstein (Sao Paulo, Brazil) · 2022Pooled it
- Systematic review and meta-analysis of the safety of chloroquine and hydroxychloroquine from randomized controlled trials on malarial and non-malarial conditions.Systematic reviews · 2021Pooled it
- Clinical trials in COVID-19 management & prevention: A meta-epidemiological study examining methodological quality.Journal of clinical epidemiology · 2021Pooled it
- Effects of chloroquine or hydroxychloroquine treatment on non-SARS-CoV2 viral infections: A systematic review of clinical studies.Reviews in medical virology · 2021Pooled it
- Pooled it
- Evaluating the methodology of studies conducted during the global COVID-19 pandemic: A systematic review of randomized controlled trials.Journal of integrative medicine · 2021Pooled it
241 more citing papers are in PubMed but not listed here.
Corrections and comments
- Commented on by
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- Commented on by
- Erratum issued
Authors and funding
24 authors at 6 institutions in 2 countries.
Funding
Abstract
backgroundNo effective oral therapy exists for early coronavirus disease 2019 (COVID-19).
objectiveTo investigate whether hydroxychloroquine could reduce COVID-19 severity in adult outpatients.
designRandomized, double-blind, placebo-controlled trial conducted from 22 March through 20 May 2020. (ClinicalTrials.gov: NCT04308668).
settingInternet-based trial across the United States and Canada (40 states and 3 provinces).
participantsSymptomatic, nonhospitalized adults with laboratory-confirmed COVID-19 or probable COVID-19 and high-risk exposure within 4 days of symptom onset.
interventionOral hydroxychloroquine (800 mg once, followed by 600 mg in 6 to 8 hours, then 600 mg daily for 4 more days) or masked placebo. MEASUREMENTS: Symptoms and severity at baseline and then at days 3, 5, 10, and 14 using a 10-point visual analogue scale. The primary end point was change in overall symptom severity over 14 days.
resultsOf 491 patients randomly assigned to a group, 423 contributed primary end point data. Of these, 341 (81%) had laboratory-confirmed infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) or epidemiologically linked exposure to a person with laboratory-confirmed infection; 56% (236 of 423) were enrolled within 1 day of symptoms starting. Change in symptom severity over 14 days did not differ between the hydroxychloroquine and placebo groups (difference in symptom severity: relative, 12%; absolute, -0.27 point [95% CI, -0.61 to 0.07 point]; LIMITATION: Only 58% of participants received SARS-CoV-2 testing because of severe U.S. testing shortages.
conclusionHydroxychloroquine did not substantially reduce symptom severity in outpatients with early, mild COVID-19. PRIMARY FUNDING SOURCE: Private donors.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.