WASHINGTON (AP) — U.S. regulators on Monday revoked emergency authorization for malaria drugs promoted by President Donald Trump for treating COVID-19 amid growing evidence they don't work and could cause serious side effects.

The Food and Drug Administration said the drugs hydroxychloroquine and chloroquine are unlikely to be effective in treating the coronavirus. Citing reports of heart complications, the FDA said the drugs' unproven benefits "do not outweigh the known and potential risks."

The decades-old drugs, also prescribed for lupus and rheumatoid arthritis, can cause heart rhythm prob...