Thus "the claim is false; quinine in tonic water is too diluted to have any effect, and there are no drugs proven to cure the disease," mentioned AFP Fact Check report.
It “seems like a made up home remedy for a medicine that is currently under clinical trials,” said Brandon Brown, a professor at University of California. "Quinine, along with its synthetic relatives chloroquine and hydroxychloroquine, are chemical compounds normally used as anti-malarial drugs. They are not proven to work as treatments for COVID-19, nor approved by the FDA as such," informed AFP.