The U.S. Food and Drug Administration (FDA) commissioner on April 11 said that ivermectin does not work at all against COVID-19, just days after his agency deleted social media posts that had urged people not to use the drug as a COVID-19 treatment.

"If you look at the randomized trials of ivermectin, and there's many of them now, there is no benefit of ivermectin in the treatment of COVID," Dr. Robert Califf said in Washington during a congressional hearing.

He also said there were risks to taking the drug.