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. 2021 Jan 15;28(30):40431–40444. doi: 10.1007/s11356-020-12200-1

Table 1.

Hydroxychloroquine-based intervention in the clinical trials as of April 25, 2020

HCQ/HCQ-Combinations in
COVID-19 treatment
Mechanism Status Study References
Hydroxychloroquine (HCQ)

• Anti-endocytosis of SARS-CoV-2

• Inhibition of TLRs signaling and thereby reduces the formation of pro-inflammatory cytokines

Phase 1 • HCQ in outpatient adults with COVID-19 (N= 210) NCT04333654 (Biot et al. 2006; Vincent et al. 2005; Macfarlane and Manzel 1998; Hacker et al. 1998; Jorge et al. 2018; Sahraei et al. 2020; Wu et al. 2020; Liu and Wang 2020)
Phase 2

• Healthcare workers prevention of COVID-19 (rate of conversion) (N= 360) NCT04333225

• Prevention and treatment by HCQ (PATCH) (N=400) NCT04329923

Phase 3

• For prevention of severe COVID19 (N=1660) NCT04329611

• For the treatment of mild COVID-19 (N=2700) NCT04340544

• Healthcare worker exposure-response and outcomes of HCQ (N=15,000) NCT04334148

• Effect of HCQ on in vivo viral clearance (N= 220) NCT04342221

• Ordinal outcomes scale (N= 510) NCT04332991

• Prevention of COVID-19 (Daily and weekly dosing) (N=3000) NCT04341441

• Prophylaxis (post exposure) (N=1600) NCT04318444

• Prophylaxis (pre exposure) (N=440) NCT04331834

Phase 4 • Therapeutic effect of HCQ, ChiCTR2000029559 (N=300), ChiCTR2000029868 (N=360)
HCQ with chloroquine Phase 4 • Therapeutic effects of chloroquine and hydroxychloroquine in severe patients ChiCTR2000029992 (N=100), ChiCTR2000029898 (N=100), ChiCTR2000029899 (N=100)
Phase 0 • Mild infection ChiCTR2000030054 (N=100)

HCQ,

Umifenovir

• Anti-endocytosis

• Inhibition of membrane fusion

Phase 0 • Preventive effect of HCQ (N=320) ChiCTR2000029803 (Zhang et al. 2020)

HCQ,

Azithromycin

• Downregulate cytokines production

• Decreases chemotaxis polymorphonuclear-neutrophils to the lungs by IL-8 inhibition

• Acceleration neutrophil apoptosis

Phase 3 • Comparison HCQ Vs Azithromycin (N= 1550) NCT04334382 (Amsden 2005; Beigelman et al. 2010; Kanoh and Rubin 2010; Zarogoulidis et al. 2012)
Phase 2

• Proactive prophylaxis (N= 226) NCT04322396

• Epidemiology of SARS-CoV-2 and Mortality to Covid19 (N=1000) NCT04341207

• Treatment of severe SARS-CoV-2 Infection (N=500) NCT04335552

• HCQ vs Azithromycin activity against Covid-19 (N=300) NCT04329832

HCQ,

Azithromycin,

Vitamins C and D,

Zinc

• Quintuple therapy to treat COVID-19 (N=600)

NCT04334512

HCQ,

Lopinavir and ritonavir

• Interference with Mpro which is a vital enzyme for the SARS-CoV-2 replication Phase 3

•Chemoprophylaxis of COVID-19 (N= 1200)

NCT04328285

(Liu et al. 2020; Adedeji and Sarafianos 2014)
Phase 2

• Comparison of lopinavir/ritonavir or HCQ (N=150)

NCT04307693

HCQ, Sarilumab Baricitinib,

Lopinavir/Ritonavir

• Anti-IL-6 receptor,

• Janus kinase inhibitor

Phase 2

• Moderate to severe coronavirus disease COVID-19 (N=1000)

NCT04321993

(Favalli et al. 2020; Fleming 2016; Stebbing et al. 2020; Richardson et al. 2020)

Ciclesonide metered dose inhaler (Alvesco),

HCQ

• Inhibits SARS-CoV-2 RNA replication

• Inhibits SARS-CoV-2 cytopathic activity

• Ciclesonide in mild COVID-19 (N=441) NCT04330586 (Matsuyama et al. 2020; Jeon et al. 2020)

Tocilizumab,

HCQ,

Azithromycin

• Competitively inhibits IL-6 receptor

• Downregulate cytokines production

• Combined use of HCQ, azithromycin, and tocilizumab (N=276) NCT04332094 (Fu et al. 2020; Luo et al. 2020)

HCQ,

Remdesivir

• Inhibits the RNA dependent RNA polymerase Phase 2, 3 • Efficacy of different anti-viral drugs (N= 700) NCT04321616 (Agostini et al. 2018; Brown et al. 2019; de Wit et al. 2020; Ko et al. 2020; Gordon et al. 2020; Warren et al. 2016)

Sarilumab, Azithromycin,

HQC

• Inhibits sIL-6R and mIL-6R receptors Phase 2,3 • Immune modulatory drugs and other treatments in COVID-19 (N=60) NCT04341870 (Lu et al. 2020)

HCQ,

Oseltamivir, Azithromycin

• Neuraminidase inhibitor Phase 3 • Therapeutic effect of drug trio (N=5) NCT04338698 (Mitjà and Clotet 2020)

HCQ,

Ascorbic Acid

• Enhances immune system Phase 2,3 • Post-exposure prophylaxis (N=2000) NCT04328961 (Hemilä 2003; Hemilä and Douglas 1999)
Phase 4 • Newly diagnosed COVID-19 as compared to standard care (N=1250) NCT04334967

Emtricitabine/Tenofovir, Disoproxil,

HCQ

• Reverse transcriptase inhibitor

• RNA synthesis inhibitors

Phase 3 • Prevention of SARS-CoV-2 infection (N=4000) NCT04334928 (Duan et al. 2020; Zhu et al. 2020; Deeks 2018)

N, number of participants in the study; NCT, ClinicalTrials.gov registry number (FDA); ChiCTR, Chinese Clinical Trial Register