In the Netherlands a scientific research came to the following results:
Results:
Among 1893 included subjects, 21-day mortality was 23.4% in 1552 subjects treated in hospitals that routinely prescribed (hydroxy)chloroquine, and 17.0% in 341 subjects that were treated in hospitals that did not. In the adjusted Cox-regression models this difference disappeared, with an adjusted hazard ratio of 1.17 (95%CI 0.88-1.55). When stratified by actually received treatment in individual subjects, the use of (hydroxy)chloroquine was associated with an increased 21-day mortality (HR 1.58; 95%CI 1.25-2.01) in the full model.
Conclusions:
After adjustment for confounders, mortality was not significantly different in hospitals that routinely treated patients with (hydroxy)chloroquine, compared with hospitals that did not. We compared outcomes of hospital strategies rather than outcomes of individual patients to reduce the chance of indication bias. This study adds evidence against the use of (hydroxy)chloroquine in patients with
COVID-19.
You can read the full article in the added pdf.
This is what Belgium concluded after tests:
In Belgium, at least 5,000 of the 17,628 hospitalized corona patients have received hydroxychloroquine. The drug is controversial, as there is no evidence yet that it works against Covid-19. Belgium has the highest death rate in the world.
Maybe thanks to the use of hydroxychloroquine?