CLOSE Dr. Raymond Woosley says anti-malarial drugs like chloroquine can cause subtle heart changes and increase a person’s risk of developing arrhythmia. USA TODAYThe U.S. Centers for Disease Control and Prevention has abruptly switched its guidance for use of a drug touted by President Donald Trump as a possible treatment for COVID-19, dropping its reference to anecdotal dosages to say simply that there are no approved drugs for dealing with the disease.The CDC’s online advice for hydroxychloroquine was updated April 7, three days after Reuters reported that the CDC was offering what the news agency called “highly unusual guidance” for the drug’s use based on “unattributed anecdotes rather than peer-reviewed science.”The updated, and shortened, guidance says simply that “hydroxychloroquine and chloroquine are under investigation in clinical trials” for use on coronavirus patients and “there are no drugs or other therapeutics approved by the U.S. Food and Drug Administration to prevent or treat COVID-19.”The CDC originally told Reuters that the earlier guidance was crafted for doctors at the request of a White House coronavirus task force, which had urged prompt action. The CDC did not immediately respond to USA TODAY’s queries about the revised guidance.Chloroquine treats malaria:Will it work against coronavirus? The side effects are risky, experts say.Your coronavirus questions, answered:  Is my


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