Phase IIb Study to Evaluate the Efficacy and Safety of Chloroquine Diphosphate in the Treatment of Patients With Comorbidities, Without Severe Acute Respiratory Syndrome, Under the New Coronavirus (SARS-CoV2): a Double-blind, Randomized, Placebo-controlled Clinical Trial

Borba et al., NCT04342650, CloroCOVID19II, NCT04342650, Jun 2020

HCQ for COVID-19

1st treatment shown to reduce risk in March 2020, now with p < 0.0000000001 from 426 studies, used in 59 countries.

No treatment is 100% effective.
Protocols combine treatments.

152 patient HCQ early treatment RCT with results not reported over 6 years after completion.
37 HCQ RCTs have results missing long after expected1-37
The trials report a total of 20,499 patients, with 12 trials having actual enrollment of 3,639, and the remainder estimated.
Borba et al., 8 Jun 2020, Double Blind Randomized Controlled Trial, placebo-controlled, Brazil, trial NCT04342650 (history) (CloroCOVID19II).